sucessful motor change out D graders

Recently spoke with friend from Texas that has successfully changed out motors in D model Graders. Maybe this information could help someone. Start with any 4 cyl industrial motor that fits within the confines of engine bay. Has 3 pulleys on front of crank obviously for alternator and hydraulic pump. Plexiglass to draw on for building adapter plate motor and bell housing . Make your measurements from center always from center he said. Use original Allis C clutch throw out bearing , pressure plate. If your not a machinist you will need a machine shop to build a flywheel to bolt on to new crank and holes to mount Allis Pressure plate. Build your flywheel as heavy as you can for the most kinetic energy you can get around 90 to 100 lb flywheel. My under standing is he milled a hole big enough for a bushing or bearing to press in center of flywheel to accommodate pilot shaft. Engineer motor mounts as needed for new motor. The D model grader, that he loaned me to grade some roads on some property I had in Coryell county texas, was one he had changed the motor out in. The motor he used in it was a 4 cyl diesel Hercules, 80 something horsepower. By the way I remember it was a military engine. If interested Google 4 cyl diesel Hercules motors several 4 cylinder motors pop up with different hp ratings.                            Hope this can help in some way.

no I don't, just my recollection . I recently bought a model DD . After getting it home found that the water pump shaft had slack, other than that just needs cosmetics . It did have cab, but I removed it because of my preference. I know where there is another grader locally that has a motor in it that overheated
, I've been thinking about buying and changing motor out in it . Hard to explain here but I have some ideas to make it more simple. For example when locating a new motor other than the obvious front pulley arrangement, you need to pay attention how far out or how for in the crankshaft is from back of motor so pilot shaft from transmission will work. Be happy to talk to you if you have questions. phone number 318 359 0292 .                     

The purpose of the really heavy flywheel was torque maintenance, as the engine built energy up and had rpm the weight of inertia of that massive chunk of steel made torque for power curve.

Edited by DMiller - 16 Jan 2019 at 6:35pm

Sorry, but I would not be able to help you. Post it on the forum somebody can.

Good photos of the engine would likely help. The casting number you posted looks like it might be a 226, possibly like used in a WD45.

That same 226 engine was also used in the D17 gas farm tractor. The transaxle of the D grader was also used by Galion graders and they used IHC engines in their graders. The engines are mounted to the transaxle by a adaptor plate so it is possible that the transaxle served a variety of purposes and a variety of engines. When I made some upgrades to my D grader I shifted the hydraulic pump to be driven off the end of the crankshaft as I could never get the belts to the hydraulic pump tight enough to stop the pump from stalling now and then even with new belts.

From from what I can determine from the grader serial number the grader was built  in 1952. I could be mistaken. From what you told me, the power unit motor  that I have must have been in the machine at some point, and replaced with the present one. The PU shows 226 on the I'd tag. Thanks to everyone who replied  to my questions. You have been most helpful.