W 250 Pickup L6-359 5.9L DSL (1989)
Inspect the push rod ball and socket for signs of scoring or cracks where the ball and the socket are pressed into the tube.
Check the push rods for roundness and straightness.
Install the push rods into the sockets of the valve tappets. Lubricate the push rod sockets with clean engine oil.
CAUTION: Make sure the rocker lever adjusting screws are completely backed out.
ROCKER LEVER ASSEMBLY - INSTALLATION
