GM Service Manual Online
For 1990-2009 cars only

Valve Rocker Arm Cover Replacement - Upper Right Side LMM

Removal Procedure


    Object Number: 1732769  Size: SH
  1. Remove the generator. Refer to Generator Replacement.
  2. Remove the exhaust gas recirculation (EGR) cooler tube. Refer to Exhaust Gas Recirculation Valve Cooler Replacement.
  3. Remove the glow plug nuts (3).
  4. Remove the engine wiring harness from the glow plugs.
  5. Remove the glow plug harness bracket bolts (1) and nut (2).

  6. Object Number: 1732560  Size: SH
  7. Remove the fuel rail pressure sensor electrical connector bracket bolt and nut.
  8. Remove the bracket from the stud.

  9. Object Number: 1848684  Size: SH
  10. Remove the transmission tube support nut at the bell housing.

  11. Object Number: 1848703  Size: SH
  12. Remove the transmission fluid fill tube upper nut and reposition the tube.
  13. Remove the EGR heater inlet hose/pipe retainer stud at the rear of the engine.
  14. Remove the EGR heater inlet hose/pipe retainer nut at the center of the lower right cylinder head.
  15. Remove the injector wire harness stud at the center lower right cylinder head.

  16. Object Number: 1335536  Size: SH

    Caution: Label all the injector electrical connectors before the connectors are removed in order to prevent reconnecting to the wrong injector. Failure to properly connect the injectors in the correct sequence will cause severe engine damage.

  17. Disconnect the engine harness electrical connectors from the fuel injectors.

  18. Object Number: 1732359  Size: SH
  19. Remove the fuel injector return line clip (1) from the injector.
  20. Remove the fuel injector return line fitting (2) from the injector.
  21. Perform the above 2 steps for the other 3 fuel injectors.
  22. Reposition the injector return line out of the way.
  23. Disconnect the right side main engine harness connector.

  24. Object Number: 1732754  Size: SH
  25. Remove the main connector bracket bolts.
  26. Reposition the engine wiring harness out of the way.

  27. Object Number: 1335614  Size: SH
  28. Prior to removing the fuel injector pipes, use compressed air to blow any debris from between the injector line and fittings. Wipe the fittings clean of debris.
  29. Spray lithium grease between the fuel injector line and fittings to assist in containing any debris during removal. Refer to Adhesives, Fluids, Lubricants, and Sealers.
  30. Caution: DO NOT use compressed air to clean debris from the fuel injector inlet after the fuel line is removed. Using compressed air can allow debris to enter the fuel injector inlet and damage the fuel injector.

  31. Remove the right fuel injector pipes.

  32. Object Number: 1335653  Size: SH
  33. Remove the upper valve rocker arm cover bolts.
  34. Remove the upper valve rocker arm cover.
  35. Remove the upper valve rocker arm cover gasket.
  36. Inspect the upper valve rocker arm cover gasket for damage, replace if necessary. Otherwise reuse the old gasket.

Installation Procedure


    Object Number: 1335653  Size: SH
  1. Install the upper valve rocker arm cover gasket.
  2. Install the upper valve rocker arm cover.
  3. Install the upper valve rocker arm cover bolts.
  4. Caution: Refer to Fastener Caution in the Preface section.


    Object Number: 1411030  Size: SH
  5. Tighten the upper valve rocker arm cover bolts in the sequence shown to 8 N·m (71 lb in).

  6. Object Number: 1335614  Size: SH

    Caution: Ensure proper torquing of the fuel injector line. An under-torqued fuel injector line will not seal properly and an over-torqued fuel injector line may damage the fuel injector fitting. An improperly sealed or damaged fuel injector line or fuel injector fitting will cause a fuel leak.

  7. Install the fuel injector pipes and tighten to 41 N·m (30 lb ft).
  8. After installing the fuel injector pipes, clean the injector pipes and apply sealant at the fittings to prevent moisture and debris from collecting between the line and fitting. Refer to Adhesives, Fluids, Lubricants, and Sealers.

  9. Object Number: 1732754  Size: SH
  10. Position the engine wiring harness.
  11. Position the main connector bracket to the generator bracket.
  12. Install the main connector bracket bolts and tighten to 10 N·m (89 lb in).
  13. Connect the right side main engine harness connector.

  14. Object Number: 1732359  Size: SH
  15. Position the injector return line.
  16. Install the fuel injector return line clip (1) to the injector.
  17. Install the fuel injector return line fitting (2) to the injector.
  18. Perform the above 2 steps for the other 3 fuel injectors.

  19. Object Number: 1732560  Size: SH
  20. Install the fuel rail pressure sensor electrical connector bracket to the stud.
  21. Install the bracket bolt and nut and tighten to 10 N·m (89 lb in).

  22. Object Number: 1848703  Size: SH
  23. Position the transmission fluid fill tube and install the upper nut and tighten to 25 N·m (18 lb ft).

  24. Object Number: 1848684  Size: SH
  25. Install the transmission tube support nut at the bell housing and tighten to 25 N·m (18 lb ft).
  26. Install the injector wire harness stud at the center lower right cylinder head.
  27. Install the EGR heater inlet hose/pipe retainer nut at the center of the lower right cylinder head.
  28. Install the EGR heater inlet hose/pipe retainer stud at the rear of the engine and tighten to 10 N·m (89 lb in).

  29. Object Number: 1335536  Size: SH
  30. Connect the engine harness electrical connectors to the fuel injectors.

  31. Object Number: 1732769  Size: SH
  32. Install the engine wiring harness to the glow plugs.
  33. Install the glow plug harness bracket bolts (1) and nut (2) and tighten to 10 N·m (89 lb in).
  34. Install the glow plug nuts (3) and tighten to 2 N·m (18 lb in).
  35. Install the EGR cooler tube. Refer to Exhaust Gas Recirculation Valve Cooler Replacement.
  36. Install the generator. Refer to Generator Replacement.