If I recall from his previous thread he was 1 1/4 plus or minus

http://www.offshoreonly.com/forums/g...r-preload.html


Another thread from 2012 with RL931 lifters. Maybe pm OP and see what he did to resolve the problem. Looks like his last post was on 4/16/16 so he's still active.

Thanks for the reference. I've read that one. Think I've read every lifter thread on this website and yellowbullet/Chevelle/etc.

They were originally set to 3/4. Sounded like a freaking tractor. Then turned them down another quarter and quieted down some. Still have noise that comes and goes.

It's amazing how much info you can gather on something we always just took for granted and wouldn't expect to have such failures with. You end up learning more than you thought imaginable. Seriously a lifter. Wtf. I understand to a degree however years ago I never recall being such an issue. Is it possible the lifters just haven't kept up with the ongoing cam lobe design/changes specs etc or is it the poor quality? Quality control? I'm not saying all companies of course but obviously is a problem these days.

I do notice yellowbullet form has some pretty good info for the most part at least on the subjects I've gathered info on from time to time. We'll be sure and keep us informed and good luck.

I think the tolerances in the lifter are too close, and they don't work well with thicker oils needed in a marine engine. Seems every thread I've read on these on auto forums that went with a light oil, and when we put light oil in these engines the noise went away.

Mild thunder and a few others are running them with straight 40 and straight 50 without any issues. Ours sounds like there is 1 or 2 acting up. Not all of them.

If it were an oil problem it would always be there, not come and go? I don't know what to think anymore.

Do you have at least an hour run time on it?

12-15 hours. Won't run it anymore until it's fixed.

Did you set up your heads or did somebody else do them? Although I agree with you on the spring pressures are not accessive however just what if you put a +.050 locks on one engine to lighten the pressures a bit. Just to try and see if it solves the problem? It would be a inexpensive and real quick thing to do outside of changing your lifters.

Probably irrelevant but what kind of roller rockers are you using?