Worn Comp Cam lobes and oil additives

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Apr 12, 2008 | 07:30 PM

#21

JimMueller

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From: Casselberry FL

PRC 5.3l heads w/ PRC platinum springs installed at 1.81", stock rockers, 3/8" 7.400 pushrods, Caddy lifters, rev kit with helper springs, German Castrol 0W30 oil. Lifter rollers all look OK, there was unusual wear on only #8 cylinder.

Apr 12, 2008 | 08:14 PM

#22

9000th01ss

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Quote:

Originally Posted by JimMueller

there was unusual wear on only #8 cylinder.

Could be caused by the lifter retainer not holding it inline with the cam lobe. If the lifter is crooked the slightest bit it won't roll right it will scrub across the lobe.

Apr 13, 2008 | 07:41 AM

#23

vettenuts

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From: Little Rhody

I think I would take the rev kit to a shop and have them check for squareness, etc. especially on the offending lobe to make sure it is truly keeping the lifter at the correct angle to the cam lobe.

Apr 13, 2008 | 01:24 PM

#24

JimMueller

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From: Casselberry FL

The guy who builds them is in the hospital due to a heart attack. Since one of the pieces cracked in cylinders 2/4, I can't get it replaced even if I was confident that it would work better in the future. So I guess the situation means I have no choice but to use the new OEM trays and it doesn't matter at this point if the piece on cyl #8 was square. Also, I don't know if the retainers were marked per se when removed, as I wasn't involved in shortblock disassembly, nor did I request that they be marked.

Apr 13, 2008 | 06:24 PM

#25

highgear

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From: Helendale, Ca (SilverLakes)

Wear should NOT be an issue on Roller Cams in any type of engine.
Unless of course the cam was made out of some really bad material. Like Clay....lol

Apr 13, 2008 | 07:26 PM

#26

vettenuts

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From: Little Rhody

Quote:

Originally Posted by JimMueller

and it doesn't matter at this point if the piece on cyl #8 was square.

Jim,

Guess my thought centered more on identifying the original source of the problem.

Apr 14, 2008 | 01:04 PM

#27

JimMueller

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From: Casselberry FL

If I came off gruff, I didn't intend it to be. I picked up the old cam and lifters today. The worn lobe is the 3rd from the rear. I can't get my cheap digicam to focus well enough at a close distance to show the wear clearly. You can slightly feel it running the finger 90* perpendicular to the lifter path. Nothing real rough, but visually it appears to be in the early stages.