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Old 05-02-2009
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How to identify a problem diesel?

I have the opportunity to spend a lot of time aboad a boat with a Universal M25 that I belive is on its way out. We had a compression test and it is really low. It also stopped once due to overheating. So I got to thinking what would give this engine away if I didn't know it so well?

It starts easy. Glow plug for 30 seconds, starts immediately.
White smoke for 45 seconds
No venting from the crankcase overflow tube.

The above would lead one to belive that something is amis but maybe not too bad. I know better.

There is a bad smell below but that could be attributed to a simple exhaust problem.

So what would I look for to confirm the low compression diagnosis?
I see this as an opportunity to improve my surveyor skills.
I have some inside knowledge, how could I deduce the state of the engine from more subtle clues?
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