GM Service Manual Online
For 1990-2009 cars only

Removal Procedure


    Object Number: 621681  Size: SH
  1. Remove the engine cover (1).

  2. Object Number: 621682  Size: SH
  3. Remove the ignition coils (1, 2, 3, 4).
  4. Disconnect the following components from the cylinder head cover:
  5. • The hose clamps
    • The two positive crankcase ventilation (PCV) hoses

    Object Number: 234134  Size: SH
  6. Remove the following components from the cylinder head:
  7. • The nine bolts
    • The two nuts
    • The two seal washers
    • The cylinder head cover (1) (with the gasket)

Installation Procedure


    Object Number: 234134  Size: SH

    Important: Use a new cylinder head cover gasket and new seal washers whenever the cylinder head cover replacement procedure is performed.

    Ensure that the new gasket and the new seal washers are correctly positioned during the cylinder head cover installation.

  1. Install the new cylinder head cover gasket to the cylinder head cover.
  2. Install the new seal washers to the cylinder head cover.
  3. Notice: Use the correct fastener in the correct location. Replacement fasteners must be the correct part number for that application. Fasteners requiring replacement or fasteners requiring the use of thread locking compound or sealant are identified in the service procedure. Do not use paints, lubricants, or corrosion inhibitors on fasteners or fastener joint surfaces unless specified. These coatings affect fastener torque and joint clamping force and may damage the fastener. Use the correct tightening sequence and specifications when installing fasteners in order to avoid damage to parts and systems.

  4. Install the cylinder head cover to the cylinder head. Secure the cover using nine bolts and two nuts (1, 2, 3).
  5. Tighten
    Tighten the cylinder head cover bolts and nuts to 10 N·m (89 lb in).


    Object Number: 621682  Size: SH
  6. Install the ignition coils (1, 2, 3, 4).
  7. Reconnect the following components to the cylinder head cover:
  8. • The hose clamps
    • The two positive crankcase ventilation (PCV) hoses

    Object Number: 621681  Size: SH
  9. Install the engine cover (1).