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?

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.

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.

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.