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Crawlers, Dozers, Loaders & Backhoes Discussion Forum

detroit diesel - dynahoe

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Chad

08-03-2004 19:26:03




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I recently got an old hy-dynamic dynahoe. It has a detroit diesel (I think 353). About a month ago it just up and quit running, I got it to start on some starting fluid but it was very slugish and had no power so I thought it was the fuel filter. Got a new filter and after finally getting all the air out of the lines it wasn't running right. It wouldn't idle and wanted to run wide open. Didn't mess with it for a week or so and now I can't even get it to start at all. Could this be a injector pump problem or is it something else? What is the pump pressure supposed to be? I'm not to familiar with diesels but have some basic knowledge. P.S. The blower flapper is not tripped.
Thanks for any help, Chad

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scott in wa.

08-06-2004 11:07:29




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 Re: detroit diesel - dynahoe in reply to Chad, 08-03-2004 19:26:03  
Just wondering if you got that thing figured out yet??
scott



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Gatractorman

08-04-2004 17:26:05




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 Re: detroit diesel - dynahoe in reply to Chad, 08-03-2004 19:26:03  
Sounds like a governor or control rack problem in that it wanted to run wide open the last time it was running. At any rate it should have at least hit on the ether (mabye it did it just wouldn't start?). The old 2-stroke Detroits did not have injection pumps per say, they did have a fuel pump driven off the back of the governor housing on the 3-53's that provided positive fuel pressure to the injectors (but very low pressure) the magic takes place under the valve cover in the injectors, they operate off an extra rocker arm that works against the top of the injector, thus metering fuel based on the height of the spring and making it's own pressure inside the injector. Those old Detroits are testy in all the adjustments that have to be made, I'd probably recommend having a professional look at it if your not 100% confident in your ability. They will run away with you at times if everything is not exactly right.

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scott in wa.

08-04-2004 08:51:25




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 Re: detroit diesel - dynahoe in reply to Chad, 08-03-2004 19:26:03  
How about cleaning your injectors?
I did have to replace my fuel pump
on a 2-53. made a massive differance, not to mention puting new n-35 injectors in.
but as far as the, wanting to over rev, that seems that it would be a different prpblem.??
scott



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