Originally posted by DennyW
Well, that's fine if you want to do it like that, but the builders always take that measurement. It is important to have the right amount of press fit. Some shafts and balancers have a slight taper, did you know that ? So, the measurements are usually taken in the middle for acuracy. Half thousand to 1 1/2 thousandths is general rule. higher rpm's a little tighter on the press fit. And always make sure the key fits in the keyway good, with at least a half thousandth top clearance.
Now where did I lay lub, my 2x4, and bfh ?
I don't doubt you, but I'm just doing a Rustoleum rebuild on this motor, not a complete blueprinting job. As far as I can tell, this is the original balancer for this engine, so it's stayed on for 50 years, more or less (may have been removed at some time for engine rebuilding I guess, but I don't know the history of the engine), so the clearances are probably okay. Anyway, it was running okay when I pulled it out to clean it up and paint it, so I'm not planning any mechanical work on it -- just make it purty and put it back in. All I wanted to do was expand the hole a bit temporarily so it would go on easier.