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PBM hyd roller lifter preload?

Old 06-05-2012, 10:24 PM
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Default PBM hyd roller lifter preload?

I have start my engine with all new parts in them, and after about 10 min the engine start to make a lifter noise on both side. I have preload them one turn after the zero lash (.050) preload, so now i dont know if they are too tight or too loose, They are PBM parts no: (RL 931).

I have start the engine with mercruiser 25W40 mineral oil i dont know if it can be a oil grade problem, my oil pressure is at 80 psi at 105f engine temp idle.

Any sugestion?
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Old 06-05-2012, 10:26 PM
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also they have no noise when it is cold the noise come only after warming up.
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Old 06-06-2012, 12:19 AM
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Originally Posted by supermx96
also they have no noise when it is cold the noise come only after warming up.
There's a real good post on morel litter preload in here with some VERY good info from Bob Madara / "rmbuilder ". If I recall correctly preload should be 3/4 turn (with alum. heads) and 1/2 turn (with iron heads) using a 7/16-20 rocker arm stud.
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Old 06-06-2012, 12:28 AM
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I'm guessing that you were not actually at zero lash when you started and they are a little loose.
Generally, 3/4 of turn from zero lash is near perfect.
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Old 06-06-2012, 05:26 PM
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I ended up setting mine and a pair I did for a friend, down
to 1 turn down to quiet them down...same symptom
as you discribe.
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