Valve Lifter Installation

NOTICE: Prime the new valve lifters before installation. The valve lifters may be damaged if the valve lifters are dry when the engine is started.





IMPORTANT: Replace the lifters when you install a new camshaft. Some engines will have both standard and 0.25 mm (0.010 inch) oversize valve lifters. The oversize lifter will have the number 10 etched on the side. The block will be stamped OS on the cast pad adjacent to the lifter bore and on the top rail of the cylinder case above the lifter bore.

1. Install the valve lifters to the engine.
- Prime the new valve lifters before installation, by working the lifter plunger while submerged in clean kerosene or diesel fuel.
- Coat the lifter roller and the bearings with lubricant GM P/N 1052367, or equivalent.
- Install the lifters in their original location.

IMPORTANT: Ensure that the straight edge of the guide plates and the clamps face away from the cylinders.





2. Install the guide plates.

NOTICE: Refer to Fastener Notice in Service Precautions.





3. Install the clamps.
Tighten the clamp bolts to 27 Nm (20 ft. lbs.).

IMPORTANT: It the engine will not turn over by hand, one or more of the lifters may be binding in the guide plates.

4. After installing the clamps, turn the crankshaft by hand 720 degrees (two full turns), in order to ensure the free-movement of the lifters in the guide plates.