REMOVAL & INSTALLATION
- Remove the valve cover.
- Remove the rocker arm retaining bolt.
Rocker arms should be installed in their original location and position during assembly.
- Remove rocker arms. If more than one rocker arm is to be removed, identify rocker arm location.
- Lubricate pushrods and rocker arms with Engine Assembly Lubricant (D9AZ-19579-D), or equivalent. Lubricate the retaining bolts with engine oil.
Prior to final tightening, the rocker arm seats must be fully seated into the cylinder head. The pushrods must be fully seated in the rocker arm and valve tappet sockets.
- Install the rocker arms into position with the pushrods and snug the retaining bolt.
- Rotate the crankshaft until the lifter is on base circle (heel) of the cam lobe.
- Tighten the rocker arm retaining bolt to 60-132 inch lbs. (7-15 Nm) on 3.0L engine or 44 inch lbs. (5 Nm) maximum on 3.8L engine.
- Final tighten bolt with camshaft in any position to 20-28 ft. lbs. (26-38 Nm).
- Install valve cover.
See Figure 1
If a pushrod, rocker arm or valve tappet must be replaced, the engine should not be cranked or rotated until the valve tappets have an opportunity to leak down to their normal operating position. The leakdown rate can be accelerated by using a Valve Tappet Bleed Down Wrench, or equivalent, on the rocker arm and applying pressure in a direction to collapse the valve tappet.
With the tappet fully collapsed and the camshaft on the base circle of the valve being checked, clearance between the rocker arm and valve head should be 0.09-0.19 in. (2.25-4.79mm).