Ever Seen a Pilot Bushing Fall Out of the Crank?
I just got done rebuilding the 408sb and reinstalling it in my Camaro a little over a month ago. I have an Autogear 4 speed in this car so I have to use a pilot bushing or bearing. I chose to install a pilot bushing this time around, even though I have had some trouble out of the bushings in the past. Anyway, after a few hundred miles, I started to notice a weird vibration when I pushed the clutch in. I have had this problem before, and it was caused by the center hub of the clutch disc being loose, which in turn caused an out of balance situation, and caused a vibration. The vibration eventually took out the pilot bushing. Anyway, a new clutch and a pilot bearing, not bushing, took care of the problem. I figured I had the same problem this time around.
So, I took the tranny out today and the pilot bushing just fell out of the crank, which was actually kind of handy since I was going to change it to a bearing. Anyway, the bushing had been spinning in the end of the crank. It was tight when I hammered it in so I don't know how it got loose enough to spin in the end of the crank. When I hammered the new bearing in today, it was very tight, just like it should be. When I installed the tranny for the first time, when the engine was fresh, I did notice that the tranny was very tight going in. I did use the bolts to press it up against the bellhousing and yes, I know that is a no no. I got lazy toward the end. Could the pilot bushing have seized to the input shaft and spun in the end of the crank? I also noticed that on initial startup, I had some clutch disengagement problems. Maybe it was because of the pilot bushing? I also noticed that the pilot bushing was mushroomed over where I hammered it in without something between the hammer and the bushing. I didn't make that mistake this time around. Has anyone ever seen or heard of anything like this?
49 Chevy 3100 Project
Acro Sport II Biplane
400 Small Block
AutoGear M22 4 Speed