| [GMCnet] Tid Bits. How you can be distorying your good running engine [message #331588] |
Tue, 01 May 2018 08:21  |
BobDunahugh
Messages: 2465
Registered: October 2010
Location: Cedar Rapids, IA
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And you will never know it till it's TOO LATE. Your 403, or 455 came with a cam gear that had an aluminum gear sprocket center. That has a plastic gear around it. Most of us are concerned about the cam chain getting loose. Thus retarding the cam shaft timing. That WILL NOT destroy your engine. But when the plastic/aluminum cam gear plastic starts to break off the aluminum core. Next the steel chain starts chewing up the aluminum sprocket core. This then can produce lots of plastic/ aluminum contamination that then restricts ( plugs up ) the oil flow of your oil filter. Then all that contamination causes the oil filter bypass valve to open. So since the oil filter can't filter the oil anymore. Then this contamination starts to destroy your engine main/rod bearings. The replacement chain/sprocket sets are all steel. So if your engine is running great. And has never been rebuilt. You ARE on barrowed time. PIROID. So a couple of hundred to replace the chain set. Or a few thousand for a complete rebuild. This well happen at some point. When we bought or first 78 Royale in 2003. One of the first things I did was to change that chain set. Our origin cam sprocket was still fine. That 403 still runs great at 154,000 miles. Simple choice. Bob Dunahugh
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