Infinity_QX4_1998-2003

Engine

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Removal & Installation



3.3L Engine
  1. Before servicing the vehicle, refer to the precautions in the beginning of this section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Recover the A/C refrigerant, if equipped.
  8.  
  9. Remove the or disconnect the following:
    NOTE
    When removing the engine mounts, do not loosen the 4 mount cover nuts. The mount is fluid filled and will not function if the fluid leaks out.



    Negative battery cable
     
    Hood
     
    Air cleaner assembly
     
    Idle Air Control (IAC) valve and solenoid connectors
     
    Throttle Position (TP) sensor and switch connectors
     
    Engine Coolant Temperature (ECT) sensor connector
     
    Manifold Absolute Pressure (MAP) sensor connector and vacuum line
     
    Evaporative Emissions (EVAP) canister purge valve connector and vacuum line
     
    Mass Air Flow (MAF) sensor connector
     
    Brake booster vacuum line
     
    Fuel lines
     
    Exhaust Gas Recirculation (EGR) temperature sensor connector
     
    Throttle cable
     
    Accessory drive belts
     
    Cooling fan and shroud
     
    Radiator and hoses
     
    Engine under cover
     
    A/C compressor manifold
     
    Power steering pump
     
    Heated Oxygen (HO 2 S) sensor connectors
     
    Exhaust front pipes
     
    Crankshaft Position (CKP) sensor
     
    Starter motor
     
    Transmission
     
    Left and right engine mounts
     
    Engine
     

  10.  

To install:

  1. Install or connect the following:

    Engine. Tighten the engine mount nuts to 43 - 58 ft. lbs. (59 - 78 Nm).
     
    Transmission
     
    Starter motor
     
    CKP sensor
     
    Exhaust front pipes
     
    HO 2 S sensor connectors
     
    Power steering pump
     
    A/C compressor manifold
     
    Engine under cover
     
    Radiator and hoses
     
    Cooling fan and shroud
     
    Accessory drive belts
     
    Throttle cable
     
    EGR temperature sensor connector
     
    Fuel lines
     
    Brake booster vacuum line
     
    MAF sensor connector
     
    EVAP canister purge valve connector and vacuum line
     
    MAP sensor connector and vacuum line
     
    ECT sensor connector
     
    TP sensor and switch connectors
     
    IAC valve and solenoid connectors
     
    Air cleaner assembly
     
    Hood
     
    Negative battery cable
     

  2.  
  3. Fill the cooling system.
  4.  
  5. Recharge the A/C system, if equipped.
  6.  
  7. Start the engine and check for leaks.

    Click image to see an enlarged view

    Fig. Engine mounts and related components-3.3L engine

  8.  

3.5L Engine
  1. Release fuel pressure.
  2.  
  3. Remove the engine hood and front RH and LH wheels.
  4.  
  5. Remove the engine undercover and suspension member stay.
  6.  
  7. Drain coolant from radiator.
  8.  
  9. Remove the following parts.

    Radiator shroud
     
    Radiator
     
    Cooling fan
     
    Drive belts
     
    Battery
     
    Engine cover
     
    Throttle wires
     

  10.  
  11. Air duct with air cleaner case.
  12.  
  13. Disconnect vacuum hoses, fuel hoses, heater hoses, EVAP canister hoses, harnesses, connectors and so on.
  14.  
  15. Remove the air conditioner compressor from bracket, then put it aside holding with a suitable wire.
  16.  
  17. Remove the power steering oil pump and reservoir tank with bracket, then put it aside holding with a suitable wire.
  18.  
  19. Remove the alternator.
  20.  
  21. Remove the exhaust front tube heat insulators, then remove rear heated oxygen sensors.
  22.  
  23. Remove exhaust front and rear tubes.
  24.  
  25. Remove the transmission.
  26.  
  27. Remove the TWC (manifold) heat insulators, then remove TWC (manifold).
  28.  
  29. Install engine slingers.
  30.  
  31. Hoist engine with engine slingers and remove front engine mounting nuts.
  32.  
  33. Remove the engine from vehicle.
  34.  

To install:

Click image to see an enlarged view

Fig. Front engine mounting-3.5L engine



Click image to see an enlarged view

Fig. Rear engine mounting-3.5L engine



Click image to see an enlarged view

Fig. Rear engine mounting-3.5L engine

Installation is in the reverse order of removal. Observe the following torques:



Front engine mount-to-bracket: 43 - 58 ft. lbs.
 
Front mount-to-frame: 32 - 41 ft. lbs.
 
Front bracket-to-block: 32 - 41 ft. lbs.
 
Rear engine mount-to-bracket: all exc. 2WD with AT: 58 - 77 ft. lbs.; 4WD with AT: 32 - 40 ft. lbs.
 
Crossmember-to-frame: 58 - 77 ft. lbs.
 

 
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