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post #4 of Old 07-20-2006
Join Date: Feb 2006
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I can't speak to the vibration, But there is something you need to check re overheating. I owned a 1980 Perkins 4-108 from 1996 to 2004. Carbon deposits built up where the water injects into the exhaust elbow. At low rpm and on short jaunts, no problem. Higher rpm and longer running periods, problem. The effect is subtle enough it is very hard to detect by watching the waterflow ejected from the exhaust. If the engine was old enough to rebuild you may have replaced this elbow. If not, take a look. Also make sure you don't have hoses that are delaminating or collapsing from the inside out.
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