GM Service Manual Online
For 1990-2009 cars only

Special Tools

J 45059 Angle Meter

Removal Procedure


    Object Number: 52299  Size: SH
  1. Drain the engine oil. Refer to Engine Oil and Oil Filter Replacement .
  2. Lower the vehicle.
  3. Remove the lower intake manifold. Refer to Lower Intake Manifold Replacement .
  4. Remove the valve rocker arms and push rods. Refer to Valve Rocker Arm and Push Rod Replacement .
  5. Remove the exhaust manifold. Refer to Exhaust Manifold Replacement - Right Side .
  6. Remove the right spark plugs. Refer to Spark Plug Replacement .
  7. Remove the generator. Refer to Generator Replacement .
  8. Notice: This component uses torque-to-yield bolts. When servicing this component do not reuse the bolts, New torque-to-yield bolts must be installed. Reusing used torque-to-yield bolts will not provide proper bolt torque and clamp load. Failure to install NEW torque-to-yield bolts may lead to engine damage.

  9. Remove and discard the cylinder head bolts.
  10. Remove the cylinder head.

  11. Object Number: 54362  Size: SH
  12. Remove and discard the cylinder head gasket.
  13. Remove the cylinder locator dowel pins, if necessary.
  14. Clean and inspect the cylinder head. Refer to Cylinder Head Cleaning and Inspection .

Installation Procedure


    Object Number: 1557860  Size: SH

    Notice: Head gaskets are specific for right hand and left hand applications, and also must be installed with the correct side facing up. Note the markings (1) on the head gaskets for proper installation. Failure to do so may lead to engine damage.

  1. Install the cylinder head locator dowel pins, if necessary.
  2. Inspect the cylinder head locator dowel pins for proper installation.

  3. Object Number: 54362  Size: SH
  4. Install the cylinder head gasket.

  5. Object Number: 52299  Size: SH
  6. Install the cylinder head and bolts.
  7. Notice: Refer to Fastener Notice in the Preface section.

    Notice: This component uses torque-to-yield bolts. When servicing this component do not reuse the bolts, New torque-to-yield bolts must be installed. Reusing used torque-to-yield bolts will not provide proper bolt torque and clamp load. Failure to install NEW torque-to-yield bolts may lead to engine damage.


    Object Number: 826677  Size: SH
  8. Install the NEW small hex cylinder head bolts (5 and 8).
  9. Install the NEW large hex cylinder head bolts (1, 2, 3, 4, 6 and 7).
  10. Tighten

    1. Tighten the cylinder head bolts a first pass in sequence to 60 N·m (44 lb ft).
    2. Tighten the cylinder head bolts a final pass in sequence to 140 degrees using the J 45059 .
  11. Install the generator. Refer to Generator Replacement .
  12. Install the right spark plugs. Refer to Spark Plug Replacement .
  13. Install the exhaust manifold. Refer to Exhaust Manifold Replacement - Right Side .
  14. Install the valve rocker arms and push rods. Refer to Valve Rocker Arm and Push Rod Replacement .
  15. Install the lower intake manifold. Refer to Lower Intake Manifold Replacement .
  16. Fill the engine with oil. Refer to Engine Oil and Oil Filter Replacement .
  17. Inspect for leaks.