parsonsj

OK, so the HRB height issue is fixed. I had to mill and turn 9mm to achieve the proper clutch depth. All is well now. Thanks to all for the help!

@MV8Crank end play should be perfect. This is a brand new Dunnell engine, with about 10 minutes run time on it. The flywheel and clutch are also Dunnell provided parts. You're right about the plate -- it was there on the old engine, but Dunnell did not provide one with the new one. In the meantime, I've gone ahead and turned the gearbox input shaft cover to allow the HRB to move back 7mm. Tomorrow, I'll set the bell up in the mill and lower the HRB adapter landings. I'll take some "perfect" measurements to make sure I cut just the right amount. I hope.

@CarlBThanks Carl. I've left a message for Bruce.

@MV8 Thanks very much. I've done exactly as you described, and I have a -6mm problem +/- 1mm. It's not as simple as just machining the bellhousing or the HRB adapter plate. The HRB rides on the gearbox input shaft housing, which has a shoulder, so that will need to be turned to allow the HRB to slide farther back. I've got the tools to make these sorts of modifications, but I wanted to talk with some experts in case there's a simpler solution.

@CarlB, have you solved this issue? I have the EXACT same problem, and am contemplating the of a lathe (to turn down the release bearing carrier on the gearbox) and a mill (to allow the aluminum plate to move about 6mm deeper). If there is a bolt-in solution, I'd be thrilled.