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Old 29-11-2009, 06:56   #1
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Location: hard aground in C.FL
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Yanmar 2QM20H Stuck Fuel Plunger?

Yanmar 2Qm20H

I seem to have a stuck plunger in the high pressure pump.
The enginine supposedly ran when placed in storage.
I had hooked the fuel feed backwards but donít think it should have done anything serious.
The delivery valve was stuck.
Fuel comes out of the pump but as soon as the delivery valves are tightened it stops from one cylinder.
Iíve replaced the delivery valve but still no fuel.

Does anyone know any tricks to this? The local Yanmar mechanic suggests I bring the engine in to get the pump looked at, an expensive and problematic undertaking at the best!
Thanks
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Old 29-11-2009, 16:21   #2
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Sounds like you have twisted one of the plungers....it is very easy to do.

I see it all the time when people don't "double wrench" when taking lines off.
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Old 29-11-2009, 17:32   #3
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No,
On this model the high pressure pump is inside the enigine, delivery valves outside.
I'll try to scan in the diagram if i can.
# Note: the engine was last run on a mix of veg oil and diesi years agol. the delivery valve was also stuck #
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Old 29-11-2009, 20:16   #4
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The only thing that is inside the engine is the bottom of the injection pump....the parts that are activated by the cam(s).

Check for a shop the cleans and rebuild injectors......not necessarily a marine repair outfit.

I sub out all my injector work to an outfit that has all the tools, parts testing equipment. My turnaround time is 24 hours...unless there is something radically wrong. It usually costs me about 2-300 bucks for a thourough cleaning and testing
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