For 1990-2009 cars

### Removal Procedure

1. Remove the exhaust camshaft position actuator. Refer to Camshaft Position Exhaust Actuator Replacement .

Important: Remove each bolt on each cap one turn at a time until there is no spring tension pushing on the camshaft.

2. Mark the bearing caps to ensure they are installed in the original position.
3. Remove the bearing cap bolts.
4. Remove the bearing caps.
5. Remove the exhaust camshaft (3).

Important: Keep all of the roller followers and hydraulic adjusters in order so that they can be reinstalled in their respective locations.

6. Remove the camshaft roller followers.
7. Remove the hydraulic element adjusters.

### Installation Procedure

1. Install the hydraulic element adjusters into their bores in the cylinder head.
2. Lubricate the hydraulic lash adjusters with GM PN 12345501 (Canadian PN 992704) or equivalent.
3. Lubricate the valve tips with GM PN 12345501 (Canadian PN 992704) or equivalent.

Important: 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.

4. Position the roller followers on the tip of the valve stem and on the lash adjuster, apply lubricate GM PN 12345501 (Canadian PN 992704) or equivalent.
5. Install the exhaust camshaft (3). Lubricate with GM PN 12345501 (Canadian PN 992704) or equivalent.
6. Install the camshaft bearing caps. Hand tighten the cap bolts.

Notice: Refer to Fastener Notice in the Preface section.

7. Tighten the bearing cap bolts in increments of 3 turns until they are seated.

Tighten
Tighten the bolts to 10 N·m (89 lb in).

8. Install the exhaust camshaft position actuator. Refer to Camshaft Position Exhaust Actuator Replacement .