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Allis Chalmers Discussion Forum
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Re: AC 6080 hard starting

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Author  [Modern View]
Longmeadow Farm

10-12-2013 14:18:13
67.252.60.236



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Early model 6080 had a 14.1 compression ratio while the later models starting at engine serial number 20833, were 15.1 to improve cold starting. Late 1983 models had a manifold air heater, as an improvement, as well. As heat causes diesel fuel to combust any additional warming (caused by increased compression) is beneficial. I would suggest you may have other problems, as I own a 1981 model year 6080 with an original 3745 hours on it. While mine retains its cold blooded reputation, nevertheless on summer mornings it fires up without the ether starting aid. Any temperature below 45 degrees... she needs a little assist from the ether button on the dash. Normally she will fire and I just hit the ether button to keep her going. Other than low hours and presumably good injectors, I rebuilt the injector pump a few years back for a "governor" problem and turned the pump to the low side. Believe it or not she starts easier and doesn't smoke nearly as much when cold. You just might have a tried engine, experiencing compression loss.

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