amount of play in pony motor crankshaft

i think the book says few thousandths, i go by "less than 1/8"" ok 4 me. good luck.

When I got my D2 you could see the pony crank drifting back n forth when running, you could literally measure the endplay/thrust with a ruler, something near a 1/4 inch, It ran like a top but I feared self destruction so I opened it up, the dowel pin that held the bearing in place was laying in the bottom of the engine and the bearing was floating loose in the block. custom aluminum bearings were made

When I got my D2 you could see the pony crank drifting back n forth when running, you could literally measure the endplay/thrust with a ruler, something near a 1/4 inch, It ran like a top but I feared self destruction so I opened it up, the dowel pin that held the bearing in place was laying in the bottom of the engine and the bearing was floating loose in the block. custom aluminum bearings were made

Mike, are you talking about end play or radial play?

Im talking about end play, I can grab the flywheel and move it around a little over 1/8 inch Im guessing.

Your pushing your luck, as stated 0.025" is the max. spec.
At 0.125" your pounding away on the thrust bearing dowel, if it hasn't dropped out already.

Mike, I made the bearings on my south bend lathe, I am limited in my toolmaker skills and still managed to make the necessary bearings, the tough part was locating the dowel pin hole. If I remember there was a trial and a error or 2

I have a lathe, but have never really learned how to use it after having it for almost 5 years lol, maybe this would be a good time to actually use it.