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Allis Chalmers Discussion Forum

WD running problems

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11-26-2003 14:47:05

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Doing a compression test what is an acceptable range. Also just wondering why the reason for positive ground..

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11-27-2003 07:48:34

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 Re: WD running problems in reply to Ren, 11-26-2003 14:47:05  
Ren, the compression pressure on a WD is listed in the Allis-Chalmers factory manual at 110 lbs. The WD-45 was bumped up to 130 lbs. As always, it's not so much that it is exactly 110 for there are variables, not the least of which is gauges themselves, then normal wear and tear comes in. But the bigger issue is that it doesn't vary so much. You'll have a little but it ought not to be a big deal. Like you would look again at a cylinder that registered say 70 lbs. and the other three ran at least 100 lbs. If you do have one that is low, try to find out whether it's the rings or the valves for example. If one is low, squirt a little oil in it and see if it picks up significantly. If it does the rings are suspect, if it doesn't then the valves or maybe even a head gasket are suspicious. Happy Thanksgiving and God Bless.

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11-26-2003 16:56:44

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 Re: WD running problems in reply to Ren, 11-26-2003 14:47:05  
Well, I guess it is because actually, electricity flows from Neg to Pos, so they set it up that way at the factory... Why they ever changed to Neg ground ia a puzzle to me..!!!

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11-27-2003 19:12:37

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 Re: Re: WD running problems in reply to Ron, 11-26-2003 16:56:44  
I was told at one time they had positive ground systems to keep corrosion down on the batterie posts. Wether there is any truth to that I am not shure. When I got my WD it was 6 volt positive ground and I left it like that for about 2 years and I never had any corrosion on the batt. posts. Then I switched it to 12 volt negative ground and now I am seeing some corrosion at the batt.

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