The Ford Barn

Bob from Northport · 11-17-2013, 09:36 AM

With the clutch bolted in place, disc as well, should there be any side to side or up and down movement in the transmission input shaft when inserted into the clutch/flywheel??

We have been trying to solve a transmission problem on a 1930 Chevrolet truck 3 speed. When I inserted another input shaft, I have movement in both directions. Several information sources indicate this could be a cause of a transmission jumping out of third gear, our problem when the engine is under a load or pulling. The pilot bearing should keep the shaft straight and true??

Thanks!!

V4F · 11-17-2013, 10:03 AM

maybe the front bearing in the transmission is bad .

Mitch//pa · 11-17-2013, 10:17 AM

the pilot bearing and front trans bearing should hold the input steady with no lateral movement. if your trying it with a dummy shaft not installed in the trans you will get back end movement as no bearing is holding it.

tbirdtbird · 11-17-2013, 10:18 AM

the pilot bearing and the front bearing in the tranny keep the input shaft properly supported and aligned on each end. Check both for slop and wear, and check the machined stub on the very front of the input shaft for wear (the part that engages the pilot bearing.

Check to be sure the bell housing and tranny bolts are tight.

The front of the output shaft rides in a recess in the input shaft and also on the rear bearing, check those places for wear

be sure the shifter detent springs and balls are tight and round.

All tranny parts need to be within spec, they all help to keep it in gear

1931 flamingo · 11-17-2013, 10:55 AM

Is there a pilot bearing installed ?? If so, is it worn (they do wear)?? Is it the original engine and trans?? Did this problem just start??
Paul in CT

Tom Endy · 11-17-2013, 11:49 AM

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Inspect the nose of the transmission input shaft. Very often it is worn. If you have a lot of lateral movement inside the pilot bearing the wear should be visible.

I keep a new pilot bearing handy and use it to check the fit on the nose of the shaft whenever rebuilding a transmission.

The input shaft can be repaired by machining the nose down and pressing a sleeve over it.

Tom Endy

glenn in camino · 11-17-2013, 10:09 PM

I always replace the pilot bearing when the flywheel is out.

11-17-2013, 09:36 AM	#1
Bob from Northport Senior Member Join Date: May 2010 Location: 215 E. 6th Street Northport, Michigan 49670 Posts: 956	Pilot bearing question With the clutch bolted in place, disc as well, should there be any side to side or up and down movement in the transmission input shaft when inserted into the clutch/flywheel?? We have been trying to solve a transmission problem on a 1930 Chevrolet truck 3 speed. When I inserted another input shaft, I have movement in both directions. Several information sources indicate this could be a cause of a transmission jumping out of third gear, our problem when the engine is under a load or pulling. The pilot bearing should keep the shaft straight and true?? Thanks!! __________________ Bob from Northport Northport, Michigan

11-17-2013, 10:03 AM	#2
V4F Senior Member Join Date: May 2010 Location: ca. Posts: 2,522	Re: Pilot bearing question maybe the front bearing in the transmission is bad . __________________ V4f

11-17-2013, 10:17 AM	#3
Mitch//pa BANNED Join Date: May 2010 Location: Bucks County, PA Posts: 11,454	Re: Pilot bearing question the pilot bearing and front trans bearing should hold the input steady with no lateral movement. if your trying it with a dummy shaft not installed in the trans you will get back end movement as no bearing is holding it.

11-17-2013, 10:18 AM	#4
tbirdtbird BANNED Join Date: May 2012 Location: inside your RAM Posts: 3,134	Re: Pilot bearing question the pilot bearing and the front bearing in the tranny keep the input shaft properly supported and aligned on each end. Check both for slop and wear, and check the machined stub on the very front of the input shaft for wear (the part that engages the pilot bearing. Check to be sure the bell housing and tranny bolts are tight. The front of the output shaft rides in a recess in the input shaft and also on the rear bearing, check those places for wear be sure the shifter detent springs and balls are tight and round. All tranny parts need to be within spec, they all help to keep it in gear __________________ '31 180A

11-17-2013, 10:55 AM	#5
1931 flamingo Senior Member Join Date: May 2010 Location: new britain,ct 06052 Posts: 9,394	Re: Pilot bearing question Is there a pilot bearing installed ?? If so, is it worn (they do wear)?? Is it the original engine and trans?? Did this problem just start?? Paul in CT

11-17-2013, 11:49 AM	#6
Tom Endy Senior Member Join Date: May 2010 Location: Southern California Posts: 3,139	Re: Pilot bearing question Sponsored Links (Register now to hide all advertisements) Inspect the nose of the transmission input shaft. Very often it is worn. If you have a lot of lateral movement inside the pilot bearing the wear should be visible. I keep a new pilot bearing handy and use it to check the fit on the nose of the shaft whenever rebuilding a transmission. The input shaft can be repaired by machining the nose down and pressing a sleeve over it. Tom Endy

11-17-2013, 10:09 PM	#7
glenn in camino Senior Member Join Date: May 2010 Location: Camino, CA. Posts: 3,086	Re: Pilot bearing question I always replace the pilot bearing when the flywheel is out.