Acura_MDX_2001-2006

Cylinder Head

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Removal & Installation



  1. Before servicing the vehicle, refer to the precautions section.
  2.  
  3. Drain the cooling system.
  4.  
  5. Relieve the fuel system pressure.
  6.  
  7. Remove or disconnect the following:

    Negative battery cable
     
    Ignition coil covers
     
    Intake manifold cover
     
    Air intake tube
     
    Accelerator cable
     
    Cruise control cable
     
    EVAP canister, breather, water bypass hoses and the bypass pipe bolt
     
    Fuel lines
     
    Brake booster vacuum line
     
    Intake manifold vacuum line
     
    Positive Crankcase Ventilation (PCV) valve and hose
     
    Power steering hose clamp
     
    Intake Manifold Runner Control (IMRC) actuator
     
    Wiring harness holder and joint connector
     

  8.  
  9. Support the engine with a jack and a block of wood.

    Side engine mount bracket
     
    Accessory drive belts
     
    Power steering pump
     
    Alternator
     
    Intake Air Temperature (IAT) sensor connector
     
    Idle Air Control (IAC) valve connector
     
    Throttle Position (TP) sensor connector
     
    Manifold Absolute Pressure (MAP) sensor connector
     
    Evaporative Emission (EVAP) canister purge valve connector
     
    Engine Coolant Temperature (ECT) sensor connector
     
    Radiator fan switch connectors
     
    ECT gauge sending unit connector
     
    Crankshaft Position (CKP) sensor connector
     
    Top Dead Center (TDC) sensor connector
     
    Exhaust Gas Recirculation (EGR) connector
     
    Variable Valve Timing and Valve Lift Electronic Control (VTEC) solenoid valve connector
     
    VTEC oil pressure switch connector
     
    Oil pressure switch connector
     
    Ignition coils
     
    Intake manifold
     
    Fuel injector connectors
     
    Fuel supply manifold
     
    Fuel injection air control valve vacuum lines
     
    Front cover
     
    Timing belt
     
    Radiator hoses
     
    Heater hoses
     
    Front and rear exhaust manifolds
     
    Coolant cross-over pipe
     
    Valve covers
     

  10.  
  11. Loosen the cylinder head bolts in sequence and 1 / 3 turns until all bolts are loose.
  12.  
  13. Remove the cylinder head.

    Click image to see an enlarged view

    Fig. Cylinder head bolt loosening sequence-MDX

  14.  

To install:

Click image to see an enlarged view

Fig. Crankshaft timing belt sprocket TDC marks. Align sprocket mark (A) with pointer (B)-MDX



Click image to see an enlarged view

Fig. Camshaft TDC marks. Align sprocket mark (A) with the back cover pointer (B)-MDX

  1. Align the crankshaft and camshaft sprocket TDC marks as shown.
  2.  
  3. Install the cylinder heads with new gaskets.
  4.  
  5. Apply clean engine oil to the cylinder head bolt threads and flanges.

    Click image to see an enlarged view

    Fig. Cylinder head bolt tightening sequence-MDX

  6.  
  7. Tighten the cylinder head bolts in sequence as follows:
    1. Step 1: 29 ft. lbs. (39 Nm).
    2.  
    3. Step 2: 51 ft. lbs. (69 Nm).
    4.  
    5. Step 3: 72 ft. lbs. (98 Nm).
    6.  

  8.  
  9. Install or connect the following:

    Valve covers
     
    Coolant cross-over pipe
     
    Front and rear exhaust manifolds
     
    Heater hoses
     
    Radiator hoses
     
    Timing belt
     
    Front cover
     
    Fuel injection air control valve vacuum lines
     
    Fuel supply manifold
     
    Fuel injector connectors
     
    Intake manifold
     
    Ignition coils
     
    Oil pressure switch connector
     
    VTEC oil pressure switch connector
     
    VTEC solenoid valve connector
     
    EGR connector
     
    TDC sensor connector
     
    CKP sensor connector
     
    ECT gauge sending unit connector
     
    Radiator fan switch connectors
     
    ECT sensor connector
     
    MAP sensor connector
     
    TP sensor connector
     
    IAC valve connector
     
    IAT sensor connector
     
    Alternator
     
    Power steering hose clamp
     
    Power steering pump
     
    Side engine mount bracket
     
    PCV valve and hose
     
    Intake manifold vacuum line
     
    Brake booster vacuum line
     
    Fuel lines
     
    Cruise control cable
     
    Accelerator cable
     
    Intake manifold cover
     
    Ignition coil covers
     
    Accessory drive belts
     
    Air intake tube
     
    EVAP control canister hose and vacuum hose
     
    Negative battery cable
     

  10.  
  11. Fill the cooling system.
  12.  
  13. Start the engine and check for leaks.
  14.  

 
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