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post #25 of Old 05-11-2012
dabnis
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Re: Runaway Yanmar 2qm15 HELP!

OK, I think I have got it? If you used #2 piston for TDC the timing is 180degrees retarted. Every engine, gas or diesel, that I have worked on uses Piston #1 for TDC settings. Which means:

1. The real intake stroke becomes the power stroke
2. The real compression stroke becomes the exhaust stroke
3. The real power stroke becomes the intake stroke
4. The real exhaust stroke becomes the compression stroke

So what, you ask? The fuel is being squirted in on the intake stroke and eventually accumulates to the point of being enough to ignite on the compression stroke. As the fuel is not all being burned because of the mixed up strokes more accumulates and the engine starts to run away.

I think

Anyway the timing thing is easy to fix, let us know.

Paul T
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