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

Anonymous-0 · Apr 18, 2010

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.

Kentb of SWMO · Apr 19, 2010

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.

Kent

Gary in da UP · Apr 19, 2010

I recently took apart a WD , the pistons are exactly 1/2 " below the deck at TDC. They are flat top pistons #224753.

BushogPapa · Apr 19, 2010

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..!

Ron.

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

Anonymous-0

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Kentb of SWMO

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Gary in da UP

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BushogPapa

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