Hydraulic Lash Adjuster-Leakdown Test
HYDRAULIC LASH ADJUSTER - LEAKDOWN TEST1. Compress the hydraulic lash adjuster to remove the engine oil if necessary.
Note
^ The leakdown test will not be accurate if it is done with engine oil in the hydraulic lash adjuster. Use testing fluid. New hydraulic lash adjusters are already filled with testing fluid.
2. Place the hydraulic lash adjuster in a commercially available hydraulic tappet leakdown tester. Add testing fluid to cover the hydraulic lash adjuster and compress the hydraulic tappet leakdown tester until the hydraulic lash adjuster is filled with testing fluid.
3. Adjust the length of the ram so that the pointer is just below the start timing mark when the ram contacts the hydraulic lash adjuster. Start timing as the pointer passes the start timing mark and end timing as the pointer reaches the center mark.