The Ford Barn

Ordsgt · 03-28-2022, 09:22 AM

I just rebuilt the transmission and have all new bearings (US made) and a new reproduction mains shaft. Transmission is fully assembled on a stand and functions fine. However observed an up and down motion on the input shaft. The shaft is not able to move up and down or sideways by hand. I put a dial indicator on the main shaft pilot shaft and the splined shaft. Both show 30 thousands run out. All I can figure is that it was machined improperly. Am I missing something else could be the problem?

katy · 03-28-2022, 10:03 AM

W/the transmission in neutral, can you turn the shaft by hand?

Ordsgt · 03-28-2022, 10:17 AM

everything turns freely in all gears and neutral

old ugly · 03-28-2022, 11:33 AM

the input shaft will have some up and down movement/play at the pilot bearing end of the shaft. the exact amount i don't know, but .030" is probably ok. others will have to comment on this number.
that is why the pilot bearing is in the end of the crank or flywheel, to support the front end of that shaft.

the bell housing alignment in relationship to the end of the crankshaft (runout) is crucial to this shaft being in alignment . make sure you check the runout on the crank-bellhousing.

Ordsgt · 03-28-2022, 02:47 PM

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problem found, I had a new input shaft but used the old output shaft. Took another trans that was apart and put that output shaft in and bingo everything was correct, no run out. As that shaft had damage from a bad roller bearing I ordered a new output shaft

Thanks

03-28-2022, 09:22 AM	#1
Ordsgt Senior Member Join Date: Sep 2020 Location: Yorktown Virginia Posts: 182	Trans overhaul issue I just rebuilt the transmission and have all new bearings (US made) and a new reproduction mains shaft. Transmission is fully assembled on a stand and functions fine. However observed an up and down motion on the input shaft. The shaft is not able to move up and down or sideways by hand. I put a dial indicator on the main shaft pilot shaft and the splined shaft. Both show 30 thousands run out. All I can figure is that it was machined improperly. Am I missing something else could be the problem?

03-28-2022, 10:03 AM	#2
katy Senior Member Join Date: Jun 2015 Location: Red Deer, Alberta Posts: 5,046	Re: Trans overhaul issue W/the transmission in neutral, can you turn the shaft by hand? __________________ If you don't hear a rumor by 10 AM, start one!. Got my education out behind the barn!

03-28-2022, 10:17 AM	#3
Ordsgt Senior Member Join Date: Sep 2020 Location: Yorktown Virginia Posts: 182	Re: Trans overhaul issue everything turns freely in all gears and neutral

03-28-2022, 11:33 AM	#4
old ugly Senior Member Join Date: Aug 2021 Location: alberta canada Posts: 585	Re: Trans overhaul issue the input shaft will have some up and down movement/play at the pilot bearing end of the shaft. the exact amount i don't know, but .030" is probably ok. others will have to comment on this number. that is why the pilot bearing is in the end of the crank or flywheel, to support the front end of that shaft. the bell housing alignment in relationship to the end of the crankshaft (runout) is crucial to this shaft being in alignment . make sure you check the runout on the crank-bellhousing. __________________ old ugly my old father-in-law told me. "listen close when people tell you how to do stuff they may know something. then do it the way you want."

03-28-2022, 02:47 PM	#5
Ordsgt Senior Member Join Date: Sep 2020 Location: Yorktown Virginia Posts: 182	Re: Trans overhaul issue Sponsored Links (Register now to hide all advertisements) problem found, I had a new input shaft but used the old output shaft. Took another trans that was apart and put that output shaft in and bingo everything was correct, no run out. As that shaft had damage from a bad roller bearing I ordered a new output shaft Thanks