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Allis Chalmers Discussion Forum

Gap between pistion and top of cylinder at TDC on WD AC

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Jacob Severin

04-18-2010 20:14:37

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I have a 1948 WD. The engine serial number is WD205109GA. I removed the head to do work. I realized the pistons come within 3/4's of an inch from the top of the cylinder at the top of the stroke. I was curious if someone pieced this motor together with parts from a different engine, or is just the way its supposed to be.

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04-19-2010 18:03:48

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 Re: Gap between pistion and top of cylinder at TDC on WD AC in reply to Jacob Severin, 04-18-2010 20:14:37  
An "All-Fuel" engine would have less compression than a Gasoline engine.. It may be hard to tell if the pistons were ever changed to raise the compression.. Yep, that "45 crank" does wonders for the WD..!! 12V will spin it right over, tho..!


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Gary in da UP

04-19-2010 08:41:43

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 Re: Gap between pistion and top of cylinder at TDC on WD AC in reply to Jacob Severin, 04-18-2010 20:14:37  
I recently took apart a WD , the pistons are exactly 1/2 " below the deck at TDC. They are flat top pistons #224753.

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Kentb of SWMO

04-19-2010 05:58:55

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 Re: Gap between pistion and top of cylinder at TDC on WD AC in reply to Jacob Severin, 04-18-2010 20:14:37  
I do not know how far down the WD piston should be BUT that is the was they were built. If you put WD pistons on a WD-45 crank the distance will be less resulting in a higher compression ratio. Make the engine a power house but most of the time you must pull start the tractor as the stock starter can not crank the engine because of the high compression. This is an old tractor pulling trick.


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