On my 99 HP500, one of the rocker rollers is about 50% on the valve stem tip. What would cause this? The rocker stud is not bent, neither is the pushrod. Guide plates are not interfering, so bent valve?

Just seems weird, one goofy rocker.

Thanks...

i have seen where the poly lock gets mushroomed at the base of the threads and causes the base of the rocker to get wedged against it and caused it to get misaleigned..

i was setting lash on my friends stock car engine last week and found this problem,,i chucked them up in the lathe and took a .002 off them it freed them up and the rockers went center..

Cool, I will look into this.

Merc did some grinding on the outside rockers for valve cover clearance. You most likley have the Crane Gold Wide Body rockers.

Except this is an inner rocker. No cover clearance issues pushing the rocker. Cover off, rocker installed and valve lashed the roller is half on and off the valve tip.

is it mushroomed like Mr Fix mentioned or is it a bent valve ?? may wanna leak that puppy down way easier fix

blew a head gasket, so couldnt do a leak down, but did the old water in the chamber test, no leaks there. The heads are going out to be conditioned while they are off, so if there is some hidden damage, it will be found.

I am going to inspect my locks. maybe order a new set.

Thanks!

put the locks in the rockers like your installing them,,should turn smoothly,,if not then they are mushroomed..

I am just going to put a new rocker stud in for that valve and new guide.

What are identical replacements for those 2 items?

Im assuming these are the correct guides, what about rocker studs? I would measure but I am not near the heads at the moment. Not sure the height of the stud.

Guides

http://www.summitracing.com/parts/NAL-12562369/