excalibur82

Like mild thunder said. That motor is a flat tappet and that is usually the sign of a bad lobe.

Cujo

i loosened off the poly lock to reinstall the push rod..i kept the set screw in place without turning it and screwed back down to zero lash..then turned another 3/4 turn till it stopped..so i assume thats where it was set to originally..

Cujo

no its a hydraulic roller

SB

iTrader: (1)

Well, there could be your answer. The Poly lock could have backed off.

Did you install these rocker arms because of a problem, or just because ?

If just because, then you did not tighten the set screw correctly to lock it down.
Would be too much of a coincidence too.

Cujo

just rebuilt both motors with all new parts..

MILD THUNDER

iTrader: (3)

Sounds like the poly lock backed off. I usually adjust the valve lash, tighten the set screw. Then, I give the 5/8 nut and set screw a 'squeak' turning both of them at the same time. Don't get crazy on them, but don't be a little girl either.

Something else to consider. I have seen the tops of rocker studs in pizz poor shape. The part where the set screw mates up against. The top of the stud needs to be flat, the set screw just holds better.

Cujo

thanks.. but like i said, the poly lock was still locked in place when i removed the valve cover..im thinking maybe a collapsed lifter..its all back together,and gonna run engine on land tomorrow and ifs all good will take out on water and try again..will let you know how it went..

mike tkach

iTrader: (3)

i dont know what brand the lifters you used are but maybe one broke where the axel goes threw the body,i have seen that happen a couple of times but usually on lifters with a lot of hours on them.i recommend pulling the intake and checking before restarting the engine.

Unlimited jd

iTrader: (5)

Are the set screws all at a similar depth in the poly lock? Usually a sign when one is way off. Maybe a lifter issue. I get what you're saying about the lock, you put it back exactly where it was and the lifter seemed to be preloaded properly.

Cujo

they are new Crower lifters..thanks, i will pull the valve cover first and turn engine over to see if all valves are moving properly before starting..and yes all locks were at the same depth..