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Allis Chalmers Discussion Forum
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WD-45

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rowdy33

07-29-2009 18:49:26




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In a compression test with all 4 spark plugs removed, is 90 PSI good or what? What is a good compression test? It ranges from 90 to 95. and i know that is good. Not so sur about 90 lbs though




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John Harmon

07-31-2009 06:01:46




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 Re: WD-45 in reply to rowdy33, 07-29-2009 18:49:26  
Does it have a miss,smokes a little? If not At 90PSI I would think blowby and rings goeing away but probably not any time real soon and not real bad for an old Engine. If you do not run it to do a job but only for amusement as I suspect, I would get some "Engine Restore",install as OLD says [credit] 40 wt OIL if you can find some or 20/50 if not and the "Engine Restore" and have fun.I've used Engine Restore for many years on old engines and have not been disapointed by the increased Engine life it contributes.

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Tramway Guy

07-30-2009 07:39:52




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 Re: WD-45 in reply to rowdy33, 07-29-2009 18:49:26  
Are you sure it's a WD45 and not an 'imposter'; like a WD with'45 decals or a WD45 with a WD engine??
Does it burn oil, and/or is there a lot of 'blowby' from the crankcase breather?



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Will Herring

07-30-2009 06:13:46




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 Re: WD-45 in reply to rowdy33, 07-29-2009 18:49:26  
Just out of curiosity...

1. What should compression be on an early and a late model WD?

2. Do you need a complete engine rebuild to fix compression issues?

3. What causes bad compression? Bad seals? Worn engine metal? Stuff wearing out?



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mlpankey

07-30-2009 08:10:36




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 Re: WD-45 in reply to Will Herring, 07-30-2009 06:13:46  
I like no less than 300 psi but i dont farm with mine .I just play with it at pulls.



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old

07-29-2009 21:25:32




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 Re: WD-45 in reply to rowdy33, 07-29-2009 18:49:26  
That be about as low as you would want. One like that can last a long time if you run a 30W/40W or 50W oil in it and keep an eye on things



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Texas Denny

07-29-2009 21:02:30




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 Re: WD-45 in reply to rowdy33, 07-29-2009 18:49:26  
It isn't great and you will be down a bit on power. However, if you are not in competition, it will probably give you years of reliable service. Problems with low compression are starting and plug fowling. If it starts good and the plugs don't fowl, you don't need to rebuild now.



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stu (ON)

07-29-2009 19:08:32




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 Re: WD-45 in reply to rowdy33, 07-29-2009 18:49:26  
Service Manual specifies WD45 at 130 psi.



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