Only the SOHC engine has a cylinder head that uses rocker arms in its valve train.
REMOVAL & INSTALLATION
See Figures 1 and 2
- Disconnect the negative battery cable.
- Remove the rocker arm cover, then inspect the cover silicone isolators for cracks or deterioration and replace as necessary.
- Uniformly remove the rocker arm assembly bolts, then carefully remove the 2 shaft and rocker arm assemblies. The shafts may be unsnapped from the lifter guideplates leaving the lifters and plates in the cylinder head. If this cannot be accomplished, remove the guideplates and lifters, but make sure to reposition the lifters in the same bores and guideplates during installation.
- If necessary, remove the rocker arms from the shafts.
- If removed, oil the shafts and install the rocker arms into position on the shafts.
- Snap one end of each lifter guide plate retaining spring onto the rocker arm shaft between the No. 1-No. 2 and the No. 3-No. 4 cylinder rocker arms.
- Install the rocker arm shaft assemblies. To prevent valve or piston damage, be sure the rocker arm tangs are squarely seated on the lifter plungers and the retaining springs are positioned in the guide plate slots.
If difficulty is encountered aligning the rocker arms on the valves and lifters, use a flat piece of wood, cardboard or an extension bar of suitable length on top of the shafts and rocker arms to hold both assemblies in position.
- Tighten the 5 rocker arm bolts on each shaft in a uniform sequence to 18 ft. lbs. (25 Nm). Verify the proper position and seating of all rocker components.
- Apply a small drop of RTV to each cylinder head and front cover T-joint. Inspect the rocker arm cover gasket and replace if necessary. Install the gasket and rocker arm cover, then tighten the fasteners uniformly to 22 ft. lbs. (30 Nm). Make sure all cover hoses and components are reconnected after installation.
- Connect the negative battery cable, start the engine and check for leaks.