Engine: Service and Repair
ENGINE ASSEMBLYWARNING: For engines not equipped with engine slingers, attach proper slingers and bolts described in PARTS CATALOG.
Use either 2-pole lift type or separate type lift as best you can. If board-on type is used for unavoidable reasons, support at the rear axle jacking point with transmission jack or similar tool before starting work, in preparation for the backward shift of center of gravity.
CAUTION: Always be careful to work safely, avoid forceful or uninstructed operations.
Do not start working until exhaust system and coolant are cool enough.
If items or work required are not covered here refer to the applicable sections.
Always use the support point specified for lifting.
REMOVAL
Engine Assembly / G35 (Sedan) 3.5L (VQ35):
Outline
At first, remove engine and transmission assembly with suspension member downward. Then separate engine from transmission.
Preparation
1. Release fuel pressure.
2. Disconnect both battery cables.
3. Remove engine hood, engine cover, battery cover, undercover and LH/RH front wheel.
4. Drain engine coolant from radiator drain plug.
5. Discharge refrigerant from A/C circuit.
6. Remove wiper arm and caul top cover.
7. Remove air duct and air cleaner case assembly.
8. Remove cooling fan.
9. Remove radiator shroud, radiator assembly, reservoir tank and hoses.
Engine Room
1. Disconnect heater hose from engine-side, and fit a plug onto hose end to prevent coolant leak.
2. Disconnect grounding wire (between vehicle to LH cylinder head).
3. Disconnect battery plus harness at vehicle side and temporarily fasten it on engine.
4. Remove battery.
5. Remove engine-room harness connectors shown in the figure.
6. Disconnect A/C piping from A/C compressor, and temporarily fasten it on vehicle with a rope.
7. Disconnect 2 body ground cables.
8. Disconnect brake booster vacuum hose.
9. Disconnect fuel feed hose and EVAP hose.
CAUTION: Fit plugs onto disconnected hoses to prevent fuel leak.
10. Remove power steering pump reservoir tank and piping from vehicle, and temporarily secure them on engine.
CAUTION: When temporarily securing, keep them upright to avoid a fluid leak.
Passenger Room Side
1. Follow procedure below to disconnect engine-room harness connectors at passenger room side, and temporarily secure them on engine.
a. Remove passenger-side kicking plate, dashboard side trim, and glove box.
b. Disconnect engine-room harness connectors at unit sides TOM, ECM and other.
c. Disengage intermediate fixing point. Pull out engine-room harnesses to engine room side, and temporarily secure them on engine.
CAUTION: When pulling out harnesses, take care not to damage harnesses and connectors.
After temporarily securing, cover connectors with vinyl or similar material to protect against foreign material adhesion.
Vehicle Underbody
1. Remove exhaust front tube.
2. Disconnect steering lower joint, and release steering shaft.
3. Separate transmission and propeller shaft.
4. Disengage shift control linkage at selector lever side. Then, temporarily secure it on transmission, so that it does not sag.
5. Remove rear plate cover from upper oil pan. Then, remove bolts fixing drive plate to torque converter.
6. Remove bolts fixing transmission to lower rear side of upper oil pan.
7. Remove front stabilizer.
8. Remove left and right tie rod ends from steering knuckle.
9. Remove lower ends of left and right struts from lower arms. 10. Remove left and right lower arms from suspension member.
Removal Work
1. Use a manual lift table caddy (commercial service tool) or equivalently rigid tool such as a transmission jack. Securely support bottom of suspension member and transaxle.
CAUTION: Put a piece of wood or something similar as the supporting surface, secure a completely stable condition.
2. Remove rear member mounting bolt.
3. Remove suspension member mounting bolt and nut.
4. Carefully lower jack, or raise lift to remove engine, transmission, and suspension member assembly. When performing work, observe the following"
CAUTION: Confirm there is no interference with vehicle.
Check that all connection points have been disconnected.
Keep in mind the center of vehicle gravity changes. If necessary, use jack(s) to support vehicle at rear jacking point(s) to prevent it from falling it off the lift.
Separation Work
1. Install engine slingers into front of right bank cylinder head and rear of left bank cylinder head.
Slinger bolts: 24.5 - 31.4 Nm (2.5 - 3.2 kgf-cm, 18 - 23 ft. lbs.)
To protect rocker cover against damage caused by tilting of engine slinger, insert spacer between cylinder head and engine rear lower slinger, in direction shown in figure.
NOTE: Spacer is a component part of engine rear upper slinger assembly.
2. Remove power steering oil pump from engine side.
3. Remove engine mounting insulator under side nut.
4. Lift with hoist and separate engine and transmission assembly from suspension member.
CAUTION: Before and during this lifting, always check if any harnesses are left connected.
Avoid damage to and oil/grease smearing or spills onto engine mounting insulator.
5. Remove alternator.
6. Remove stator motor.
7. Separate engine from transmission assembly.
8. Remove engine mounting insulator and bracket.
INSTALLATION
Install in the reverse order of removal paying attention to the following.
For a location with a positioning pin, insert it securely into hole of mating part.
For a part with a specified installation orientation, refer to component figure in "Removal and Installation".
When installing front engine mounting bracket on cylinder block, tighten 2 upper bolts (shown as A in figure) first. Then tighten 2 lower bolts (shown as B in figure). (Left and right sides)
Tighten rear member mounting bolts in numerical order shown in figure.
INSPECTION AFTER INSTALLATION
Before starting engine, check the levels of coolant, lubrications and working oils. If less than required quantity, fill to the specified level.
Use procedure below to check for fuel leakage.
a. Turn ignition switch ON (with engine stopped). With fuel pressure applied to fuel piping, check for fuel leakage at connection points.
b. Start engine. With engine speed increased, check again for fuel leakage at connection points.
- Run engine to check for unusual noise and vibration.
- Warm up engine thoroughly to make sure there is no leakage of coolant, lubricants, working oil, fuel and exhaust gas.
- Bleed air from passages in pipes and tubes of applicable lines, such as in cooling system.
- After cooling down engine, again check amounts of coolant, lubricants, oil, and fluid. Refill to specified level, if necessary.