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post #11 of 19 Old 06-21-2009
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I would remove the injector and have it serviced. From your description of the engines run profile, this sounds like the culprit.

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post #12 of 19 Old 06-21-2009
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Here is how I would attack the problem.
Remove incoming fuel line from high pressure/injector pump. Attach a hose to a nipple, attach long nosed funnel to another end of hose. (Any hose will do the job, as long it is close in diameter)
Make sure the hose and funnel is clean. Get cleanest fuel, splash it into funnel. Start the engine.
Basically you are running the engine now by-passing most of the fuel system, using gravity feed.
If engine runs fine (chances are 9 out of 10) then you have a problem with fuel supply –lift pump, dirty fuel, bad filters, air is sipping in, something stuck in there..
If engine is not running fine, then, in order of probability
a. Compression
b. Fuel injector
c. High pressure pump
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post #13 of 19 Old 06-22-2009
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When bleeding are you getting air??

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post #14 of 19 Old 06-22-2009 Thread Starter
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well after talking to a yanmar guy he says to pull the pump and injector and get em checked out.

as for the ? of air on bleeding yes i did get air after changing the filter but once purged it was just fuel

no compression check check yet, and its a 1gm yanmar, first line in the OP
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post #15 of 19 Old 06-22-2009
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Had a similar problem on my Yanmar YSE8. I ended up needing a new head gasket and cleaned carbon out of the head, and piston top. Also set the valve lash and injector timing at the same time. It starts hot or cold in a second or two now.



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post #16 of 19 Old 06-23-2009
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Have the valves been adjusted lately?

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post #17 of 19 Old 06-23-2009 Thread Starter
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Quote:
Originally Posted by timebandit View Post
Have the valves been adjusted lately?
no they have not and i cant seem to find a service manual online for free. i have several site that say they have it until you try and its either buy and they dont have it at all
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post #18 of 19 Old 06-23-2009
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1gm

Where are you located? I have a shop manual,compression guage and yanmar experience. I am in southern MD. Let me know know if you would like to borrow anything. Most likely you have a rusted out cylinder head, squirts water in the exhaust valve(very little) it puts the fire out so to speak.


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post #19 of 19 Old 06-23-2009
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Air getting in the system or injector pump, mostly likely injector pump from what you've said here. Pull your pump out and have it tested. I've been a diesel mechanic for 16 years and it sounds like a worn out injector pump.
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