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Allis Chalmers Discussion Forum

Compression check on WD45?

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12-24-2017 17:31:55

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I have a Allis WD45 1955 that I have had for 15 years and use it about 20 hours a year. The machine runs real good and strong. It does smoke a bit when cold but tends to go away when warmed up.

Today I ran a compression check on all engine cylinders and got like 145 PSI out of every one. That is way more than what I would have expected. Does that sound right for wd45?

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Brian G. NY

01-08-2018 13:54:45

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 Re: Compression check on WD45? in reply to JEK1, 12-24-2017 17:31:55  
Not many repair manuals give the compression pressure of an engine but rather recommend comparing the pressure between cylinders.
However, the WD-45 "Owners" manual shows a compression pressure of 125 PSI for the gas engine.
Based on that, I would say the stock pistons have been replaced with something like D-17 or LP gas.
I bet she "barks" very nicely!

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12-28-2017 11:19:49

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 Re: Compression check on WD45? in reply to JEK1, 12-24-2017 17:31:55  
Even though the engine never had valve seals, a set installed on the intake valves will probably eliminate the smoke at start-up..and they are cheap..

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12-25-2017 14:20:55

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 Re: Compression check on WD45? in reply to JEK1, 12-24-2017 17:31:55  
Probably the best thing that could happen is to hook it onto a plow or disc and work it for a couple of hours. Maybe hook a loaded wagon or trailer behind it and go for a 20 mile drive at full throttle. I have a feeling the spark plugs could be changed to one heat range hotter for the way it gets used ?? Like AC Delco 46-S instead of 45-S ??

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12-25-2017 15:38:12

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 Re: Compression check on WD45? in reply to DrAllis, 12-25-2017 14:20:55  
Just to let you know I have found the NGK 3112 plugs work a whole lot better then the champ and AC or auto lite plugs do. I run them in my ford and A/C tractor and they have made a big difference as to how quickly they foul or not. I have a WD45 that would foul plugs and it has yet to foul the NGK3112s I put in

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12-25-2017 08:22:24

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 Re: Compression check on WD45? in reply to JEK1, 12-24-2017 17:31:55  
To me that says you have an engine that tis still in good shape. If I where you I would try a quart of ATF in 5 gal of gas and see if the smoking when cold goes away because that could be as simple as rings sticking or carbon build up

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12-24-2017 17:50:10

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 Re: Compression check on WD45? in reply to JEK1, 12-24-2017 17:31:55  
WD-45 gas cranking compression is 130 psi as per A-C specs. The D-17 engine was 145 psi. So, it either has D-17 pistons/sleeves or maybe M&W pistons/sleeves. On a side note, WD-45 LPGas pistons were the same as D-17 gas pistons/ sleeves. Anyway, a WD-45 was kind of a tiger anyway, but when they were up-rated to this compression they were really mean for their size !!!

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