adjustment on HD Morel lifters
 

Searched the old threads and there is a bunch of opinions on correct pre-load on HD morel lifters. What should it be? Seat pressure #175, open 475 lbs.

I was told .050 to .070. About 5/8 of a turn on a big block chev.

Advantage,
With a 7/16-20 stud @ the fulcrum point there is .050” drop per full turn. A 5/8 turn results in a .031” drop at the fulcrum with a resultant drop of .049” at the lifter with a 1.7 rocker ratio. I have seen, in most instances that preload figure will yield audible noise.

One full turn yields a .050” drop at the fulcrum with a resulting drop of .079” at the lifter. A three quarter to one full turn will place the plunger at the proper height to purge the chamber and eliminate any audible mechanical sound. This figure is marginally past the half way point of available lifter travel.

These figures are for iron/aluminum, and will be ~ ¼ turn less with iron/iron combinations.

Bob

Thanks Bob. When the T&D's come in, i'll get with you on two sets of pushrods.