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post #1 of 3 Old 10-15-2014 Thread Starter
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Injection pump too short?

So my ongoing engine saga continues. Is it possible when my injection pump was rebuilt, that it was reassembled too short? The timing on the Yanmar is adjusted by putting shims in and taking shims out to change when the bottom of the pump is pushed by a cam.
If I add shims, the injector pops later, and if I take them out, it pops sooner. Problem is, even if I take all of them out, it still pops late. I can only think that the bottom of the pump has somehow shrunk about 1mm.
Basically I cannot get the timing right, the best I can get is about 6 teeth late (which is about 5-6 degrees I guess).

Orange Crush
1974 C&C27 MkII

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post #2 of 3 Old 10-16-2014
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Was the engine in time before the pump work? Mating surfaces clean, no gasket, only spray sealant?
Rebuilding the pump is not supposed to alter the timing. When I had mine done the timing did not change.
Does it run now?
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post #3 of 3 Old 10-16-2014 Thread Starter
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Re: Injection pump too short?

Well, more digging and chat with an injection specialist. Turns out that the injector firing is nothing to do with timing the engine, but also the rail slider thing on the pump has to be in the central position, i.e. flush. With the throttle set half way as per the shop manual, the slider thing is not in the middle, I had to partially pull the engine stop lever too. I now have the timing close enough.

Orange Crush
1974 C&C27 MkII

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