The Ford Barn - View Single Post

rotorwrench · 12-27-2019, 09:55 AM

Push fit is anywhere from .001" to .0015". .002" is good for a rotational clearance that doesn't need to be a push fit. I've seen the V8 flywheels with the old phosphor bronze bushing worn egg shaped and they were still working albeit not as well as they should. Now if it was more than .002", then I'd start to get concerned. The input shaft bearing has clearance too or the bearings would last very long.

Rotating bearing fits have to have some clearance or there can be galling from excessive temperature built up. The only time the pilot really turns is when the clutch is released. Folks that stand on the clutch too long will experience more wear. Put the transmission in neutral and release the clutch.

12-27-2019, 09:55 AM	#18
rotorwrench Senior Member Join Date: Jun 2010 Location: San Antonio, Texas Posts: 16,422	Re: Pilot Bearing Question Push fit is anywhere from .001" to .0015". .002" is good for a rotational clearance that doesn't need to be a push fit. I've seen the V8 flywheels with the old phosphor bronze bushing worn egg shaped and they were still working albeit not as well as they should. Now if it was more than .002", then I'd start to get concerned. The input shaft bearing has clearance too or the bearings would last very long. Rotating bearing fits have to have some clearance or there can be galling from excessive temperature built up. The only time the pilot really turns is when the clutch is released. Folks that stand on the clutch too long will experience more wear. Put the transmission in neutral and release the clutch.