1. Ensure roller rotates smoothly and without excessive play. Inspect all components for damage. Ensure plunger moves freely in plunger body. Replace valve lifter if plunger fails to move freely in plunger body or if any components are damaged. Valve lifter must be replace as an assembly.
2. Measure valve lifter outside diameter and valve lifter bore diameter in cylinder block.
Determine oil clearance. Replace valve lifter if oil clearance is not within specification. See VALVE LIFTERS table under ENGINE SPECIFICATIONS.