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Re: Re: Re: JD diesel will not start
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Posted by jdemaris on February 26, 2004 at 05:28:45 from (209.23.31.225):
In Reply to: Re: Re: JD diesel will not start posted by Dirthog on February 26, 2004 at 04:05:37:
Yeah . . . I said I was being simplistic and I wasn't trying to write a service manual - just provide some non-technical real-world advice. Guess you can add #5 to your list - the diesel needs someone to start it. Or #1b - the CORRECT fuel, or #3b - not just compression, but enough compression to cause enough heat for combustion to result, etc. etc. &c. Another note - if there is no air, what is being compressed?
Since, as far as I can tell, the thing ran when it was borrowed, but now does not - and needed a new radiator - I made some quick assumptions based on data provided, i.e. inferrence. Lack of air isn't going to make the engine push white smoke at cranking speed. As far as timing goes, theres very little chance, on that engine, that the timing got far enough out to prevent it from starting unless someone had it apart. There's no timing chain, and nothing inside the pump that can make it go that far out of wack. The pump driveshaft is designed to shear when strained, but if so, it would pump NO fuel. The fuel-pressure regulator inside the Roosa Master injection pump can blow its plug and overadvance - but not at cranking speed. The pump's head and rotor can get scored to a point where not enough fuel can be pumped to start at cranking speed, the old-style governor weight retaining ring can shatter and subsequently, pieces of it can plug the housing pressure-regulator/check-valve where the return fuel line hooks - and make the pump shut off after it starts, etc. etc.
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