{ "glb": "/models/components/987/engine.glb", "parts": [ { "id": "intake-manifold", "node": "intakeManifold", "label": "Intake Manifold", "assembly": "Induction", "system": "Engine", "tier": "primary", "partNumber": "9A111011502", "function": "Distributes filtered air from the throttle body through twin bridge tubes into both cylinder banks." }, { "id": "throttle-body", "node": "throttleBody", "label": "Throttle Body", "assembly": "Induction", "system": "Engine", "tier": "primary", "partNumber": "9A110530403", "function": "Regulates the volume of air entering the intake plenum based on driver throttle demand." }, { "id": "maf-sensor", "node": "mafSensor", "label": "MAF Sensor / Air Intake", "assembly": "Induction", "system": "Engine", "tier": "primary", "partNumber": null, "componentId": "airfilter", "function": "Measures the mass of incoming air in the intake snorkel so the DME can meter fuel." }, { "id": "air-oil-separator", "node": "airOilSeparator", "label": "Air-Oil Separator (AOS)", "assembly": "Induction", "system": "Engine", "tier": "primary", "partNumber": "9A1107042000", "function": "Separates oil mist from crankcase blow-by gases and returns clean vapor to the intake." }, { "id": "intake-camshaft", "node": "camshaft_intake", "label": "Intake Camshafts", "assembly": "Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105279020", "function": "Open and close the intake valves in time with the crankshaft via cam lobes." }, { "id": "exhaust-camshaft", "node": "camshaft_exhaust", "label": "Exhaust Camshafts", "assembly": "Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105281010", "function": "Open and close the exhaust valves in time with the crankshaft via cam lobes." }, { "id": "timing-chain", "node": "timingChain", "label": "Timing Chain & Tensioner", "assembly": "Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105142020", "function": "Links the crankshaft to the camshafts to keep valve timing in sync; the tensioner holds chain tension." }, { "id": "crankshaft", "node": "crankshaft", "label": "Crankshaft", "assembly": "Rotating Assembly", "system": "Engine", "tier": "primary", "partNumber": "9A1102072000", "function": "Converts the reciprocating motion of the pistons into rotational output torque." }, { "id": "pistons", "node": "pistons", "label": "Pistons & Rods", "assembly": "Rotating Assembly", "system": "Engine", "tier": "primary", "partNumber": "9A1103926000", "function": "Compress the air-fuel mixture and transmit combustion force, via the connecting rods, to the crankshaft." }, { "id": "crank-pulley", "node": "crankPulley", "label": "Crank Pulley / Vibration Damper", "assembly": "Rotating Assembly", "system": "Engine", "tier": "primary", "partNumber": "9A1375262000", "function": "Drives the serpentine belt and damps torsional vibration of the crankshaft." }, { "id": "fuel-rail", "node": "fuelRail", "label": "Fuel Rail & Injectors", "assembly": "Fuel & Ignition", "system": "Engine", "tier": "primary", "partNumber": "9A1110859020", "function": "Distributes high-pressure DFI fuel (40–120 bar) to the injectors on the 3.4-litre 987.2 S engines; rails sit under the intake system with the pressure sensor on the bank 2 rail." }, { "id": "coil-packs", "node": "coilPacks", "label": "Ignition Coils (x6, Rod-Type)", "assembly": "Fuel & Ignition", "system": "Engine", "tier": "primary", "partNumber": "9A160210407", "componentId": "plugs", "function": "Rod-type ignition modules with integral output driver, one per plug, fired individually in the order 1-6-2-4-3-5 by the DME (987.2, 2009 Service Introduction p49/50)." }, { "id": "spark-plugs", "node": "sparkPlugs", "label": "Spark Plugs (x6, Surface-Gap)", "assembly": "Fuel & Ignition", "system": "Engine", "tier": "primary", "partNumber": null, "componentId": "plugs", "function": "Surface-gap plugs with four ground electrodes around the insulator — self-cleaning tip, no gap adjustment (987.2). Ignite the compressed air-fuel mixture in each combustion chamber." }, { "id": "alternator", "node": "alternator", "label": "Alternator", "assembly": "Accessory Drive", "system": "Engine", "tier": "primary", "partNumber": "9A160301600", "function": "Generates electrical power and charges the battery while the engine runs." }, { "id": "ac-compressor", "node": "acCompressor", "label": "A/C Compressor", "assembly": "Accessory Drive", "system": "Engine", "tier": "primary", "partNumber": "9A112601105", "function": "Pressurizes refrigerant to drive the air-conditioning cooling cycle." }, { "id": "water-pump", "node": "waterPump", "label": "Water Pump", "assembly": "Accessory Drive", "system": "Engine", "tier": "primary", "partNumber": "9A1106048010", "function": "Circulates coolant between the engine and radiators to regulate temperature." }, { "id": "serpentine-belt", "node": "serpentineBelt", "label": "Serpentine Belt & Pulleys", "assembly": "Accessory Drive", "system": "Engine", "tier": "primary", "partNumber": "9A1102218000", "componentId": "belt", "function": "Transfers crank rotation to the alternator, A/C compressor and water pump; tensioner and idler pulleys guide it." }, { "id": "oil-filter-housing", "node": "oilFilterHousing", "label": "Oil Filter Housing", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "primary", "partNumber": "9A1107024000", "componentId": "oil", "function": "Holds the cartridge oil filter that removes contaminants from circulating oil." }, { "id": "oil-pump", "node": "oilPump", "label": "Oil Pump (Demand-Controlled)", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "primary", "partNumber": "9A1107050110", "function": "Electronically demand-controlled pressure pump in the oil pan (pulley side), chain-driven by the crankshaft; its housing also carries the four cylinder-head extraction pump stages — five pumps in total (987.2, 2009 Service Introduction p20–22)." }, { "id": "thermostat-housing", "node": "thermostatHousing", "label": "Thermostat Housing", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "primary", "partNumber": "9A1106226020", "function": "Houses the thermostat that regulates coolant flow so the engine reaches operating temperature." }, { "id": "cylinder-head-l", "node": "cylHead_L", "label": "Cylinder Head (Left Bank)", "assembly": "Structure", "system": "Engine", "tier": "primary", "partNumber": "9A1104913150", "function": "Caps the left bank cylinders, carrying the valves and combustion chambers." }, { "id": "cylinder-head-r", "node": "cylHead_R", "label": "Cylinder Head (Right Bank)", "assembly": "Structure", "system": "Engine", "tier": "primary", "partNumber": "9A1104914150", "function": "Caps the right bank cylinders, carrying the valves and combustion chambers." }, { "id": "crankcase", "node": "crankcase", "label": "Crankcase", "assembly": "Structure", "system": "Engine", "tier": "primary", "partNumber": "9A1101927010", "function": "The split-case aluminum block housing the crankshaft, bores and main bearings." }, { "id": "sump", "node": "sump", "label": "Sump / Oil Pan", "assembly": "Structure", "system": "Engine", "tier": "primary", "partNumber": "9A1107032750", "function": "Reservoir at the bottom of the engine that collects and holds the oil supply." }, { "id": "starter-motor", "node": "starterMotor", "label": "Starter Motor", "assembly": "Structure", "system": "Engine", "tier": "primary", "partNumber": "9A160410900", "function": "Cranks the engine over against the flywheel ring gear to start it." }, { "id": "cam-cover-l", "node": "camCover_L", "label": "Cam Cover (Left Bank)", "assembly": "Valvetrain", "system": "Engine", "tier": "sub", "parent": "cylinder-head-l", "partNumber": "9A1105231040", "function": "Seals the top of the left cylinder head over the camshafts and retains oil in the valvetrain." }, { "id": "cam-cover-r", "node": "camCover_R", "label": "Cam Cover (Right Bank)", "assembly": "Valvetrain", "system": "Engine", "tier": "sub", "parent": "cylinder-head-r", "partNumber": "9A1105232040", "function": "Seals the top of the right cylinder head over the camshafts and retains oil in the valvetrain." }, { "id": "variocam-actuator", "node": "varioCamActuator", "label": "VarioCam Actuators", "assembly": "Valvetrain", "system": "Engine", "tier": "sub", "parent": "intake-camshaft", "partNumber": "9A1105053010", "function": "Oil-pressure solenoids that advance and retard intake cam timing for VarioCam variable valve timing." }, { "id": "timing-chain-tensioner", "node": "timingChainTensioner", "label": "Timing Chain Tensioner", "assembly": "Valvetrain", "system": "Engine", "tier": "sub", "parent": "timing-chain", "partNumber": "9A1105157020", "function": "Hydraulic plunger and shoe that takes up slack in the timing chain to keep cam/crank timing exact." }, { "id": "crank-sprocket", "node": "crankSprocket", "label": "Crankshaft Sprocket", "assembly": "Valvetrain", "system": "Engine", "tier": "sub", "parent": "timing-chain", "partNumber": "9A1105147020", "function": "Toothed gear on the crankshaft nose that drives the timing chain." }, { "id": "flywheel", "node": "flywheel", "label": "Flywheel & Ring Gear", "assembly": "Rotating Assembly", "system": "Engine", "tier": "sub", "parent": "crankshaft", "partNumber": null, "function": "Stores rotational inertia at the crank rear and carries the ring gear the starter engages." }, { "id": "connecting-rods", "node": "conRods", "label": "Connecting Rods", "assembly": "Rotating Assembly", "system": "Engine", "tier": "sub", "parent": "pistons", "partNumber": "9A1103914020", "function": "Link each piston to its crankpin, transmitting combustion force to the crankshaft." }, { "id": "injectors", "node": "injectors", "label": "Fuel Injectors (x6)", "assembly": "Fuel & Ignition", "system": "Engine", "tier": "sub", "parent": "fuel-rail", "partNumber": "9A1110128110", "function": "Spray finely atomized, metered fuel directly into each combustion chamber for DFI." }, { "id": "alternator-pulley", "node": "alternatorPulley", "label": "Alternator Pulley", "assembly": "Accessory Drive", "system": "Engine", "tier": "sub", "parent": "alternator", "partNumber": "9A1102146020", "function": "Belt-driven pulley with one-way clutch that spins the alternator rotor." }, { "id": "tensioner-pulley", "node": "tensionerPulley", "label": "Belt Tensioner Pulley", "assembly": "Accessory Drive", "system": "Engine", "tier": "sub", "parent": "serpentine-belt", "partNumber": "9A1102212000", "componentId": "belt", "function": "Spring-loaded pulley that keeps the serpentine belt under constant tension." }, { "id": "idler-pulley", "node": "idlerPulley", "label": "Idler Pulley", "assembly": "Accessory Drive", "system": "Engine", "tier": "sub", "parent": "serpentine-belt", "partNumber": "9A1106248000", "componentId": "belt", "function": "Smooth pulley that routes and guides the serpentine belt around the accessory drive." }, { "id": "oil-filler-neck", "node": "oilFillerNeck", "label": "Oil Filler Neck & Cap", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "sub", "parent": "oil-filter-housing", "partNumber": "9A1107016220", "componentId": "oil", "function": "Capped tube where fresh engine oil is poured into the crankcase." }, { "id": "oil-pickup-tube", "node": "oilPickupTube", "label": "Oil Pickup Tube & Strainer", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "sub", "parent": "oil-pump", "partNumber": "9A1107075100", "function": "Draws oil from the sump through a strainer screen into the oil pump." }, { "id": "motor-mount-l", "node": "motorMount_L", "label": "Engine Mount (Left)", "assembly": "Structure", "system": "Engine", "tier": "sub", "parent": "crankcase", "partNumber": "9A1375046010", "function": "Hydraulic mount that supports the left side of the engine and isolates vibration from the chassis." }, { "id": "motor-mount-r", "node": "motorMount_R", "label": "Engine Mount (Right)", "assembly": "Structure", "system": "Engine", "tier": "sub", "parent": "crankcase", "partNumber": "9A1375046020", "function": "Hydraulic mount that supports the right side of the engine and isolates vibration from the chassis." }, { "id": "bellhousing", "node": "bellhousing", "label": "Bellhousing", "assembly": "Structure", "system": "Engine", "tier": "sub", "parent": "crankcase", "partNumber": "9A1101022010", "function": "Bolts to the rear of the crankcase and mates the engine to the transaxle, enclosing the flywheel." }, { "id": "dipstick-tube", "node": "dipstickTube", "label": "Dipstick Tube", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "sub", "parent": "sump", "partNumber": "9A1107264000", "componentId": "oil", "function": "Guides the oil-level dipstick down into the sump for checking the oil level." }, { "id": "eng-block-001", "node": "engineBlock", "label": "Engine Block (Aluminum Alloy, Flat-Six)", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": "9A1101934070", "function": "Horizontally opposed aluminum alloy block with two cylinder banks and Nikasil-lined bores that forms the structural core of the MA1 engine." }, { "id": "eng-block-002", "node": "crankshaftForged", "label": "Crankshaft (Forged Steel)", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": "9A1102077200", "function": "Forged steel crankshaft with seven main bearings that converts piston reciprocation into rotational torque." }, { "id": "eng-block-003", "node": "connectingRods", "label": "Connecting Rods x6 (Forged H-Beam)", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": "9A1103914020", "function": "Forged steel H-beam connecting rods that transmit combustion force from each piston to the crankshaft." }, { "id": "eng-block-004", "node": "pistonsDfi", "label": "Pistons x6 with Piston Rings", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": "9A1103926000", "function": "Bowl-crown pistons designed for DFI spray pattern, sealing combustion gases and transferring force to the connecting rods." }, { "id": "eng-block-005", "node": "mainBearingCaps", "label": "Main Bearing Caps", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": "9A1101052000", "function": "Structural caps that clamp the six main bearing journals to retain the crankshaft within the block." }, { "id": "eng-block-006", "node": "oilPickupStrainer", "label": "Oil Pickup Tube and Oil Strainer", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": "9A1107075100", "function": "Submerged tube and mesh strainer that draws oil from the wet sump into the oil pump." }, { "id": "eng-block-007", "node": "oilPanSump", "label": "Oil Pan / Sump (Lower Crankcase)", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": "9A1107032750", "function": "Aluminum lower crankcase sump of the integrated dry-sump system (approx. 8.3 l with filter on the 987.2 3.4), with a watertight sheet-metal panel between crankcase and oil pan and a drain plug boss." }, { "id": "eng-block-008", "node": "intermediateShaft", "label": "Intermediate Shaft (IMS) — 987.1 Engines", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": null, "function": "Applies to the 987.1 M96/M97: the intermediate shaft relays crankshaft drive to the cam chains and its bearing is the model's notorious failure point. The 987.2 9A1 shown here has NO intermediate shaft — each bank's camshafts are driven directly by the crankshaft via a duplex sleeve-type chain (2009 Service Introduction, p16)." }, { "id": "eng-block-009", "node": "flexPlate", "label": "Dual-Mass Flywheel (PDK / Manual)", "assembly": "Short Block", "system": "Engine", "tier": "primary", "partNumber": null, "function": "Dual-mass flywheel bolted to the crankshaft rear: on 987.2 PDK cars it transmits engine torque into the wet double clutch (2009 Service Introduction, p90); on manuals it carries the 240 mm single-plate dry clutch (self-adjusting X-Tend on S models)." }, { "id": "eng-head-001", "node": "cylinderHeadBank1", "label": "Cylinder Head Bank 1 (Driver Side)", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1104913150", "function": "DOHC aluminum cylinder head for the driver-side bank, housing four valves per cylinder and the combustion chambers." }, { "id": "eng-head-002", "node": "cylinderHeadBank2", "label": "Cylinder Head Bank 2 (Passenger Side)", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1104914150", "function": "Mirror DOHC aluminum cylinder head for the passenger-side bank, housing four valves per cylinder." }, { "id": "eng-head-003", "node": "intakeCamBank1", "label": "Intake Camshaft Bank 1", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105279020", "function": "VarioCam Plus intake camshaft for Bank 1 providing variable timing and two-stage valve lift." }, { "id": "eng-head-004", "node": "exhaustCamBank1", "label": "Exhaust Camshaft Bank 1", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105281010", "function": "VarioCam Plus exhaust camshaft for Bank 1 providing variable valve timing on the exhaust side." }, { "id": "eng-head-005", "node": "intakeCamBank2", "label": "Intake Camshaft Bank 2", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105280020", "function": "VarioCam Plus intake camshaft for Bank 2, same specification as Bank 1." }, { "id": "eng-head-006", "node": "exhaustCamBank2", "label": "Exhaust Camshaft Bank 2", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105282010", "function": "VarioCam Plus exhaust camshaft for Bank 2, same specification as Bank 1." }, { "id": "eng-head-007", "node": "intakeValves", "label": "Intake Valves x12", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105312020", "function": "Sodium-filled intake valves that open to admit the air-fuel charge into each combustion chamber while dissipating heat." }, { "id": "eng-head-008", "node": "exhaustValves", "label": "Exhaust Valves x12", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105322020", "function": "Exhaust valves that open to expel combustion gases from each cylinder after the power stroke." }, { "id": "eng-head-009", "node": "hydraulicTappets", "label": "Hydraulic Valve Lifters / Tappets x24", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105070040", "function": "Bucket-type hydraulic tappets positioned under each cam lobe that automatically maintain zero valve clearance." }, { "id": "eng-head-010", "node": "valveSprings", "label": "Valve Springs x24", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105110010", "function": "Coil springs that return each valve to its closed seat after the cam lobe passes." }, { "id": "eng-head-011", "node": "camBearingCaps", "label": "Camshaft Bearing Caps", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1105275070", "function": "Precision caps that clamp the camshaft journals in the cylinder head to retain the cams in position." }, { "id": "eng-head-012", "node": "headGaskets", "label": "Cylinder Head Gaskets x2 (MLS)", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "primary", "partNumber": "9A1104142040", "function": "Multi-layer steel head gaskets that seal combustion pressure and coolant passages between each cylinder head and the block." }, { "id": "eng-vc-001", "node": "vanosSolenoidB1Intake", "label": "VarioCam Solenoid Bank 1 Intake", "assembly": "VarioCam Plus", "system": "Engine", "tier": "primary", "partNumber": "99860619100", "function": "Electrohydraulic solenoid that controls oil flow to the Bank 1 intake cam phaser for variable timing adjustment." }, { "id": "eng-vc-002", "node": "vanosSolenoidB1Exhaust", "label": "VarioCam Solenoid Bank 1 Exhaust", "assembly": "VarioCam Plus", "system": "Engine", "tier": "primary", "partNumber": "94810711311", "function": "Electrohydraulic solenoid that controls oil flow to the Bank 1 exhaust cam phaser for variable timing." }, { "id": "eng-vc-003", "node": "vanosSolenoidB2Intake", "label": "VarioCam Solenoid Bank 2 Intake", "assembly": "VarioCam Plus", "system": "Engine", "tier": "primary", "partNumber": "99860619100", "function": "Electrohydraulic solenoid for Bank 2 intake cam phasing; susceptible to contamination faults (P0000C area)." }, { "id": "eng-vc-004", "node": "vanosSolenoidB2Exhaust", "label": "VarioCam Solenoid Bank 2 Exhaust", "assembly": "VarioCam Plus", "system": "Engine", "tier": "primary", "partNumber": "94810711311", "function": "Electrohydraulic solenoid that controls oil flow to the Bank 2 exhaust cam phaser for variable timing." }, { "id": "eng-vc-005", "node": "camPositionSensors", "label": "Camshaft Position Sensors x4", "assembly": "VarioCam Plus", "system": "Engine", "tier": "primary", "partNumber": null, "function": "Hall-effect sensors, one per camshaft, that report cam phase angle to the DME for closed-loop VarioCam control." }, { "id": "eng-vc-006", "node": "camPhasers", "label": "Cam Phasers / VVT Actuators x4", "assembly": "VarioCam Plus", "system": "Engine", "tier": "primary", "partNumber": "9A1105053010", "function": "Vane-type hydraulic phasers bolted to each cam nose that rotate the camshaft relative to the drive sprocket." }, { "id": "eng-vc-007", "node": "variocamLiftActuators", "label": "VarioCam Plus Lift Actuators x12", "assembly": "VarioCam Plus", "system": "Engine", "tier": "primary", "partNumber": "9A1105053050", "function": "Two-stage lift switching pins, one per cylinder per bank, that engage a second cam lobe profile for high-lift operation." }, { "id": "eng-timing-001", "node": "primaryTimingChain", "label": "Timing Chain (Duplex, Crank to Cams)", "assembly": "Timing System", "system": "Engine", "tier": "primary", "partNumber": "9A1105142020", "function": "On the 987.2 9A1 the camshafts of each bank are driven DIRECTLY by the crankshaft via one duplex sleeve-type chain per bank — there is no intermediate shaft (2009 Service Introduction, p16). On 987.1 M96/M97 engines a primary chain drives the IMS instead." }, { "id": "eng-timing-002", "node": "secondaryTimingChains", "label": "Camshaft Timing Chains x2 (One per Bank)", "assembly": "Timing System", "system": "Engine", "tier": "primary", "partNumber": "9A1105233020", "function": "One duplex sleeve-type chain per cylinder bank, driven directly by the crankshaft on the 9A1, turning that bank's camshafts for precise valve timing (2009 Service Introduction, p16)." }, { "id": "eng-timing-003", "node": "chainTensioners", "label": "Chain Tensioners x3", "assembly": "Timing System", "system": "Engine", "tier": "primary", "partNumber": "9A1105157020", "function": "Hydraulic self-adjusting tensioners that maintain correct tension in the primary and secondary timing chains." }, { "id": "eng-timing-004", "node": "chainGuides", "label": "Chain Guides and Tensioner Rails", "assembly": "Timing System", "system": "Engine", "tier": "primary", "partNumber": "9A1105153030", "function": "Plastic guide rails that support and direct the timing chains to prevent vibration and wear." }, { "id": "eng-timing-005", "node": "timingChainCovers", "label": "Timing Chain Covers x2", "assembly": "Timing System", "system": "Engine", "tier": "primary", "partNumber": "9A1105038000", "function": "Aluminum covers, one per bank, that enclose the secondary timing chain assemblies and retain oil." }, { "id": "eng-timing-006", "node": "crankPositionSensor", "label": "Crankshaft Position Sensor (CKP)", "assembly": "Timing System", "system": "Engine", "tier": "primary", "partNumber": null, "function": "Reads the toothed tone wheel on the crankshaft to provide engine speed and crank angle data to the DME." }, { "id": "eng-fuel-hpfp", "node": "highPressureFuelPump", "label": "High-Pressure Fuel Pump (DFI, 3-Piston)", "assembly": "Fuel System", "system": "Engine", "tier": "primary", "partNumber": "9A111050101", "function": "Three-piston pump on the bank 1 cylinder head, driven by the exhaust camshaft; builds 40–120 bar (up to ~180 l/h) with integrated flow control valve, pressure control valve and temperature compensator. Fitted to the 3.4-litre DFI engines (2009 Service Introduction, p42)." }, { "id": "eng-fuel-portinj", "node": "portInjectors", "label": "Port Injectors x6 (EV14 — 2.9 MPI)", "assembly": "Fuel System", "system": "Engine", "tier": "primary", "partNumber": null, "function": "Bosch EV14 intake-manifold injectors used on the 987.2 2.9-litre MPI engines (~4 bar system pressure, DME ME 7.8.2). The 3.4-litre S engines use direct injection only — they have no port injectors." }, { "id": "eng-fuel-lowline", "node": "fuelLineLow", "label": "Low-Pressure Fuel Lines (Tank\u2192HPFP)", "assembly": "Fuel System", "system": "Engine", "tier": "sub", "parent": "eng-fuel-hpfp", "partNumber": "9A111090614", "function": "Rubber/metal fuel delivery lines from the fuel tank to the high-pressure pump inlet." }, { "id": "eng-fuel-hpsen", "node": "fuelPressureSensorHP", "label": "Fuel Pressure Sensor (High-Side)", "assembly": "Fuel System", "system": "Engine", "tier": "sub", "parent": "eng-fuel-hpfp", "partNumber": null, "function": "Fitted on the bank 2 rail; reports rail pressure (40–120 bar) to the DME for closed-loop control via the pump's flow control valve (2009 Service Introduction, p46)." }, { "id": "eng-fuel-regreg", "node": "fuelPressureRegLow", "label": "Fuel Pressure Regulator (Low-Side)", "assembly": "Fuel System", "system": "Engine", "tier": "sub", "parent": "eng-fuel-hpfp", "partNumber": null, "function": "In-tank regulator maintaining approx. 5.0 bar low-side pressure to the high-pressure pump on DFI cars (approx. 4.0 bar on the 2.9 MPI) — 2009 Service Introduction, p39/40." }, { "id": "eng-mgmt-001", "node": "dmeEcu", "label": "DME / Engine Control Unit", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": null, "function": "987.2 engine control: Bosch ME 7.8.2 on the 2.9-litre MPI engines, EMS SDI 3.1 on the 3.4-litre DFI engines (2009 Service Introduction, p34/58). Manages injection, ignition, VarioCam Plus and drive-by-wire throttle." }, { "id": "eng-mgmt-002", "node": "throttlePositionSensors", "label": "Throttle Position Sensors (Dual Track)", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "9A1110530600", "function": "Redundant dual-track TPS sensors integrated in each throttle body that relay throttle plate angle to the DME." }, { "id": "eng-mgmt-003", "node": "coolantTempSensor", "label": "Coolant Temperature Sensor (ECT)", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "99760621300", "function": "NTC sensor that monitors engine coolant temperature and enables the DME to adjust fuelling and ignition during warm-up." }, { "id": "eng-mgmt-004", "node": "acceleratorPedalSensor", "label": "Accelerator Pedal Position Sensor (APP)", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "98112301200", "function": "Drive-by-wire pedal sensor that sends driver throttle demand to the DME for electronic throttle control." }, { "id": "eng-mgmt-005", "node": "engineWiringHarness", "label": "Engine Wiring Harness", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "9A1612201300", "function": "Main engine loom that interconnects all sensors, actuators, injectors, coils, and solenoids with the DME." }, { "id": "engine-new-001", "node": "airFilterElement", "label": "Air Filter Element", "assembly": "Induction", "system": "Engine", "tier": "sub", "parent": "maf-sensor", "partNumber": "98111013000", "function": "Replaceable paper/foam filter element inside the airbox that traps dust and debris before air enters the engine." }, { "id": "engine-new-002", "node": "airFilterHousing", "label": "Air Filter Housing", "assembly": "Induction", "system": "Engine", "tier": "sub", "parent": "maf-sensor", "partNumber": "98111021101", "function": "Plastic airbox that holds the air filter element and channels filtered air to the throttle body." }, { "id": "engine-new-003", "node": "highPressureFuelPump", "label": "High-Pressure Fuel Pump (DFI)", "assembly": "Fuel & Ignition", "system": "Engine", "tier": "primary", "partNumber": "9A1110315060", "function": "Cam-driven high-pressure pump that pressurizes fuel to 150+ bar for direct fuel injection into the combustion chambers." }, { "id": "engine-new-004", "node": "oilSumpUpperPart", "label": "Oil Sump Upper Part (Internal Baffle)", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "sub", "parent": "sump", "partNumber": "9A1107031200", "function": "Upper sump section with baffles that prevents oil starvation during high-g cornering in the mid-engine layout." }, { "id": "engine-new-005", "node": "oilSumpGasket", "label": "Oil Sump Gasket", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "sub", "parent": "sump", "partNumber": "9A1107315030", "function": "Formed gasket that seals the oil sump to the crankcase to prevent oil leaks at the sump flange." }, { "id": "engine-new-006", "node": "oilFilterInsert", "label": "Oil Filter Insert (Cartridge)", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "sub", "parent": "oil-filter-housing", "partNumber": "9A1107224000", "function": "Replaceable cartridge filter element that removes metallic and carbon contaminants from the engine oil circuit." }, { "id": "engine-new-007", "node": "crankshaftMainBearings", "label": "Crankshaft Main Bearings", "assembly": "Short Block", "system": "Engine", "tier": "sub", "parent": "crankshaft", "partNumber": "9A1101052000", "function": "Plain shell bearings that support the crankshaft main journals inside the crankcase under full oil-film lubrication." }, { "id": "engine-new-008", "node": "conRodBearings", "label": "Connecting Rod Bearing Shells", "assembly": "Short Block", "system": "Engine", "tier": "sub", "parent": "connecting-rods", "partNumber": "9A1103053000", "function": "Tri-metal shell bearings at the big-end of each connecting rod that ride on the crankshaft rod journals." }, { "id": "engine-new-009", "node": "pistonRings", "label": "Piston Ring Sets x6", "assembly": "Short Block", "system": "Engine", "tier": "sub", "parent": "pistons", "partNumber": "9A1103050020", "function": "Compression and oil-control rings that seal combustion pressure above each piston and scrape excess oil from the bore walls." }, { "id": "engine-new-010", "node": "crankshaftOilSeal", "label": "Crankshaft Oil Seals (Front & Rear)", "assembly": "Short Block", "system": "Engine", "tier": "sub", "parent": "crankshaft", "partNumber": "9A1101222020", "function": "Radial shaft seals at the front and rear of the crankshaft that prevent oil leaking out of the crankcase." }, { "id": "engine-new-011", "node": "oilHeatExchanger", "label": "Oil-to-Water Heat Exchanger", "assembly": "Lubrication & Cooling", "system": "Engine", "tier": "primary", "partNumber": "9A1107450100", "function": "Engine-mounted oil cooler that transfers heat between engine oil and coolant to maintain optimal oil temperature." }, { "id": "engine-new-012", "node": "valveStemSeals", "label": "Valve Stem Seals x24", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "sub", "parent": "eng-head-007", "partNumber": "99610511552", "function": "Rubber seals fitted to each valve guide that prevent engine oil from being drawn down the valve stems into the combustion chamber." }, { "id": "engine-new-013", "node": "timingChainSprocketCam", "label": "Cam Sprockets x4", "assembly": "Timing System", "system": "Engine", "tier": "sub", "parent": "eng-timing-002", "partNumber": "9A1105148020", "function": "Toothed sprockets at each camshaft nose that receive drive from the secondary timing chains." }, { "id": "engine-new-014", "node": "oilSeparatorCrankcase", "label": "Crankcase Oil Separator", "assembly": "Induction", "system": "Engine", "tier": "sub", "parent": "air-oil-separator", "partNumber": "9A1107380010", "function": "Secondary cyclonic oil separator mounted on the crankcase that scavenges oil mist from blow-by gases before they re-enter the intake." }, { "id": "eng-new-015", "node": "headBolts", "label": "Cylinder Head Bolts (TTY) x12 per Bank", "assembly": "Cylinder Heads & Valvetrain", "system": "Engine", "tier": "sub", "parent": "cylinder-head-l", "partNumber": "9A1104213020", "function": "Torque-to-yield head bolts that clamp each cylinder head to the block; single-use fasteners replaced at every head-off service." }, { "id": "eng-new-016", "node": "valveCoverGasketL", "label": "Valve Cover Gasket (Left Bank)", "assembly": "Valvetrain", "system": "Engine", "tier": "sub", "parent": "cam-cover-l", "partNumber": "9A1105441140", "function": "Formed rubber gasket that seals the left cam cover to the cylinder head to prevent oil leaks." }, { "id": "eng-new-017", "node": "valveCoverGasketR", "label": "Valve Cover Gasket (Right Bank)", "assembly": "Valvetrain", "system": "Engine", "tier": "sub", "parent": "cam-cover-r", "partNumber": "9A1105441150", "function": "Formed rubber gasket that seals the right cam cover to the cylinder head to prevent oil leaks." }, { "id": "eng-new-018", "node": "knockSensors", "label": "Knock Sensors x2", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "99760627200", "function": "Piezoelectric sensors, one per cylinder bank, that detect combustion knock and signal the DME to retard ignition timing." }, { "id": "eng-new-019", "node": "lambdaSensors", "label": "Lambda / O2 Sensors x4", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "9A160618301", "function": "Wideband lambda sensors upstream and downstream of each catalytic converter for closed-loop AFR and OBD monitoring." }, { "id": "eng-new-020", "node": "mapSensor", "label": "MAP Sensor (Manifold Absolute Pressure)", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "99760613502", "function": "Measures intake manifold pressure so the DME can calculate air-charge density for accurate fuelling at all load points." }, { "id": "eng-new-021", "node": "imsBearing", "label": "IMS Bearing (Intermediate Shaft Bearing)", "assembly": "Short Block", "system": "Engine", "tier": "sub", "parent": "eng-block-008", "partNumber": "9A1105183060", "function": "Ball or roller bearing supporting the rear of the intermediate shaft; the known 9A1 wear item replaced as a preventive measure." }, { "id": "eng-new-022", "node": "harmonicBalancer", "label": "Harmonic Balancer / Vibration Damper", "assembly": "Rotating Assembly", "system": "Engine", "tier": "sub", "parent": "crank-pulley", "partNumber": "9A1375262000", "function": "Rubber-bonded inertia ring on the crank pulley that damps high-frequency torsional vibrations in the crankshaft." }, { "id": "eng-new-023", "node": "intakeAirBypassActuator", "label": "Intake Air Bypass / Resonance Flap Actuator", "assembly": "Induction", "system": "Engine", "tier": "sub", "parent": "intake-manifold", "partNumber": "9A1111185200", "function": "Electric actuator that opens and closes the resonance flap inside the intake manifold to tune volumetric efficiency across the rev range." }, { "id": "eng-new-024", "node": "exhaustGasTempSensor", "label": "Exhaust Gas Temperature Sensors x2", "assembly": "Engine Management", "system": "Engine", "tier": "primary", "partNumber": "9A160621200", "function": "Thermocouple sensors upstream of each catalytic converter that monitor exhaust temperature for catalyst protection and OBD compliance." } ] }