Econoline E450 V8-5.4L SOHC VIN L (1998)
Lifter / Lash Adjuster: Testing and Inspection
Leakdown Test
1. Compress the valve tappet to remove the engine oil if necessary.
NOTE: The leakdown test will not be accurate if it is done with engine oil in the valve tappet. Use testing fluid. New valve tappets are already
filled with testing fluid.
2. Place the (A) valve tappet in a (B) commercially available hydraulic tappet leakdown tester. Position the (C) steel ball provided in the plunger
cap. Add testing fluid to cover the valve tappet and compress the hydraulic tappet leakdown tester until the valve tappet is filled with testing fluid.
3. Adjust the length of the (A) ram so that the (B) pointer is just below the (C) start timing mark when the ram contacts the valve tappet. Start timing
as the pointer passes the (C) start timing mark and end timing as the pointer reaches the (D) center mark.
