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Studebaker M15A-20 "Mr. Potato Head"

Wednesday, November 30, 2011

Correct Pilot Bearing

After installing the transmission and then installing the engine into the truck I worried that there was something wrong because difficulty bolting it up. So I pressed the clutch, put the transmission in high gear, and tried rotating the transmission output shaft. It took a breaker bar and a 4' pipe to turn it - not good!! So I pulled the engine, removed the transmission and dismantled the clutch. I found that the pilot bearing was not fully pressed into the flywheel. The pilot bearing was distorted from the it's installation and it appeared to be the wrong part. The transmission input shaft would not slide into the pilot bearing. I removed it and ordered the correct bearing. The correct bearing was shorter and the correct inside and outside dimension. It pressed into the flywheel with little effort and slides nicely onto the transmission input shaft. I put everything back together and installed the engine back into the truck. I then preformed the same test and the transmission output shaft now spins freely by hand...

 New correct pilot bearing slips onto transmission nicely

 Installing new bearing

 As I tapped the bearing in I checked squareness with calipers

 New bearing installed

 New installed bearing slides nicely onto the transmission input shaft

 Flywheel install on crankshaft

 I left the pressure plate loosely mounted on the flywheel and used the transmission input shaft to align the clutch plate, then tightened the pressure plate

 I used grease to determine how far in the the input shaft engaged the pilot bearing

Transmission mouted and ready to go into the truck

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