Hydraulic Valve Lifter Assembly
Lifters are serviced as assemblies only and parts are not interchangeable. See Fig 1. Always check rocker arm-to-valve stem clearance before concluding a noisy lifter is defective. After cleaning and reassembling lifters, they should be tested for leakdown rate. Use lifter tester according to directions of manufacturer. Leakdown rate is 10-50 seconds measured at 1/16" plunger travel under a 50 pound load.