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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 - LH Removal / Installation - 4.0L >> Removal and Installation

Removal and Installation

  1. Disconnect the negative battery cable. See BATTERY DISCONNECT .
  2. Detach the accelerator cable from the throttle body (TB) and the accelerator cable bracket.
  3. Detach the exhaust manifold-to-exhaust gas recirculation (EGR) valve tube from the EGR valve.

    Tightening Torque 

    34 Nm {3.5 kgf-m, 25 ft-lbf} 

  4. Disconnect the evaporative emission (EVAP) purge valve-to-intake manifold tube from the intake manifold.
  5. Detach the EVAP purge valve-to-intake manifold tube retainer.
  6. Disconnect the differential pressure feedback EGR sensor electrical connector.
  7. Detach the wiring harness retainer from the differential pressure feedback EGR sensor.
  8. Remove the differential pressure feedback EGR sensor.
  9. Disconnect the fuel supply tube spring lock coupling. See SPRING LOCK COUPLINGS .
  10. Remove the fuel supply tube-to-cylinder head bracket bolt.

    Tightening Torque 

    10 Nm {1.0 kgf-m, 89 in-lbf} 

  11. Remove the fuel supply tube-to-valve cover bracket bolt.

    Tightening Torque 

    6 Nm {0.6 kgf-m, 53 in-lbf} 

  12. Disconnect the camshaft position (CMP) sensor electrical connector.
  13. Disconnect the EGR vacuum regulator solenoid electrical connector.
  14. Disconnect the EGR vacuum regulator solenoid vacuum connector.
  15. Remove the bolts and the EGR vacuum regulator solenoid.

    Tightening Torque 

    10 Nm {1.0 kgf-m, 89 in-lbf} 

  16. Loosen the bolt and disconnect the wiring harness electrical connector.

    Tightening Torque 

    6 Nm {0.6 kgf-m, 53 in-lbf} 

  17. Remove the bolt and position the wiring harness connector and bracket aside.

    Tightening Torque 

    6 Nm {0.6 kgf-m, 53 in-lbf} 

    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 ignition coil terminal. Mark the spark plug wire locations before removing them.
  18. Disconnect the LH spark plug wires from the ignition coil.
  19. Detach the LH spark plug wire retainer from the ignition coil bracket.
  20. Detach the LH spark plug wire retainer from the valve cover stud bolt.
  21. Disconnect the ignition coil electrical connector.
  22. Detach the wiring harness retainer from the ignition coil bracket.
  23. Disconnect the radio interference capacitor electrical connector.
  24. Detach the accelerator cable bracket from the ignition coil.
  25. Remove the 4 bolts and position the ignition coil and bracket aside.

    Tightening Torque 

    Lower rear bolt 28 Nm {2.9 kgf-m, 21 ft-lbf} 

    Lower front bolt 23 Nm {2.3 kgf-m, 17 ft-lbf} 2 upper bolts 8 Nm {0.8 kgf-m, 71 in-lbf} 

  26. Disconnect the positive crankcase ventilation (PCV) hose from the PCV valve.
  27. Twist and detach the PCV valve from the valve cover.
  28. Disconnect the 3 LH fuel injector electrical connectors.
  29. Detach the wiring harness retainer from the LH valve cover stud bolt.
  30. Loosen the bolts and remove the LH 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.
  31. Clean the sealing surfaces and inspect the LH valve cover gasket. Install a new gasket if necessary.
  32. To install, reverse the removal procedure.