GM Service Manual Online
For 1990-2009 cars only

Exhaust Camshaft Installation


    Object Number: 1403926  Size: SH
  1. Install the hydraulic lash adjusters into their bores in the cylinder head. Apply lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent.

  2. Object Number: 1825091  Size: SH
  3. Lubricate the valve tips with GM P/N 12345501 (Canadian P/N 992704) or equivalent.

  4. Object Number: 1403921  Size: SH

    Note: Used roller followers must be returned to the original position on the camshaft. If the camshaft is being replaced, the roller followers actuated by the camshaft must also be replaced.

  5. Position the roller followers on the tip of the valve stem and on the lash adjuster. Apply lubricant GM P/N 12345501 (Canadian P/N 992704) or equivalent.

  6. Object Number: 1825076  Size: SH

    Note: The engine is timed top-dead center exhaust stroke.

  7. When installing the camshafts, ensure the intake camshaft notch is in the 5 o'clock position (2) and the exhaust camshaft notch is in the 7 o'clock position (1). The number 1 piston should be at top dead center (TDC), crankshaft key at 12 o'clock.

  8. Object Number: 1403931  Size: SH
  9. Set the exhaust camshaft on top of the roller followers in the camshaft bearing journals. Lubricate with GM P/N 12345501 (Canadian P/N 992704) or equivalent.
  10. Install the camshaft caps and hand start the camshaft cap bolts.
  11. Caution: Refer to Fastener Caution in the Preface section.

  12. Tighten the camshaft cap bolts in increments of 3 turns until they are seated, lubricate. Tighten the camshaft caps to 10 N·m  (89 lb in).

Intake Camshaft Installation


    Object Number: 1404027  Size: SH
  1. Install the hydraulic lash adjusters into their bores in the cylinder head.
  2. Lubricate the hydraulic lash adjusters with GM P/N 12345501 (Canadian P/N 992704) or equivalent.

  3. Object Number: 1825091  Size: SH
  4. Lubricate the valve tips.

  5. Object Number: 1403946  Size: SH

    Note: Used roller followers must be returned to the original position on the camshaft. If the camshaft is being replaced, the roller followers actuated by the camshaft must also be replaced.

  6. Position the roller followers on the tip of the valve stem and on the lash adjuster. Lubricate roller followers with GM P/N 12345501 (Canadian P/N 992704) or equivalent.

  7. Object Number: 1825076  Size: SH

    Note: The engine is timed top-dead center exhaust stroke.

  8. When installing the camshafts, ensure the intake camshaft notch is in the 5 o'clock position (2) and the exhaust camshaft notch is in the 7 o'clock position (1). The number 1 piston should be at top dead center (TDC), crankshaft key at 12 o'clock.

  9. Object Number: 1403944  Size: SH
  10. Set the intake camshaft on top of the roller followers in the camshaft bearing journals. Lubricate with GM P/N 12345501 (Canadian P/N 992704) or equivalent.
  11. Install the camshaft caps and hand start the camshaft cap bolts.
  12. Tighten the camshaft cap bolts in increments of 3 turns until they are seated. Tighten the camshaft caps to 10 N·m  (89 lb in).