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Home >> Mazda >> 2006 >> B4000 Base, Automatic >> Repair and Diagnosis (Single Page) >> Engine Mechanical >> Mechanical >> Engine Mechanical [Service Information 4.0L] >> Valve Cover - RH Removal / Installation - 4.0L >> Removal and Installation

Removal and Installation

    All vehicles 

  1. Drain the cooling system. See ENGINE COOLANT REPLACEMENT - 4.0L .
  2. Remove the air cleaner outlet pipe. See AIR CLEANER OUTLET TUBE REMOVAL / INSTALLATION - 4.0L .
  3. Remove the upper radiator hose.
  4. Disconnect the A/C vacuum reservoir hose.
  5. Disconnect the crankcase breather hose.

    6. Vehicles equipped with an automatic transaxle 

  6. Remove the transaxle fluid level indicator tube nut and position the tube aside.

    Tightening Torque 

    23 Nm {2.3 kgf-m, 17 ft-lbf} 

    7. All vehicles 

  7. Disconnect the heated positive crankcase ventilation (PCV) coolant hose from the intake manifold heated PCV fitting.
  8. Disconnect the heater hose from the thermostat housing.
  9. Disconnect the heater hose from the front lower heater tube assembly.
  10. Disconnect the heater hose from the rear upper heater tube assembly.
  11. Disconnect the heater hose from the rear lower heater tube assembly.
  12. Remove the heater tube assembly bolts

    Rear Bolt Tightening Torque 

    23 Nm {2.3 kgf-m, 17 ft-lbf} 

    Front Bolt Tightening Torque 

    28 Nm {2.9 kgf-m, 21 ft-lbf} 

  13. Lift the heater tube assembly and detach the wiring harness retainer. Remove the heater tube assembly.
  14. Disconnect the heater hose from the heater core and position the heater hose aside.
  15. Disconnect the mass air flow (MAF) sensor electrical connector.
  16. Detach the wiring harness retainer from the generator and position the wiring harness aside.
    Fig 1: Twisting The Spark Plug Wire Boots
    G04307492Courtesy of MAZDA MOTORS CORP.
    CAUTION:
    • It is important to twist the spark plug wire boots while pulling upward to avoid possible damage to the spark plug wire.
    NOTE:
    • Spark plug wires must be connected to the correct spark plug. Mark spark plug wire locations before removing them.
    NOTE:
    • Apply silicone brake caliper grease and dielectric compound to the inside of the spark plug wire boots before connecting them.
  17. Using the spark plug wire remover SST  , disconnect the RH spark plug wires from the spark plugs.
  18. Detach the spark plug wire retainer from the valve cover stud bolt and position the spark plug wires aside.
  19. Disconnect the RH fuel injector electrical connectors.
  20. Detach the wiring harness retainer from the valve cover stud bolt and position the wiring harness aside.
  21. Loosen the bolts and remove the RH valve cover.

    Tightening Torque 

    10 Nm {1.0 kgf-m, 89 in-lbf} 

    CAUTION:
    • Do not use metal scrapers, wire brushes, power abrasive discs or other abrasive means to clean the sealing surfaces. These tools cause scratches and gouges which make leak paths.
  22. Clean the sealing surfaces and inspect the RH valve cover gasket. Install a new gasket if necessary.
  23. To install, reverse the removal procedure.
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