Pilot bearing journal diameter

[Gary57210]

What is the range of dimension for the main drive shaft pilot bearing journal? It's for a later transmission if that makes a difference.

 

[Terry Burtz Calif]

The diameter of the hole for the 40 mm pilot bearing in the flywheel is 1.5738/1.5743 inches.

 

[Gary57210]

Thank you for the help.

 

[Chuck Sea/Tac]

You can buy a pilot bearing with a slightly smaller ID. then, assuming your input shaft is worn, it can be turned down and reused. Assuming the gears are good.

 

[Bob Bidonde]

The transmission shaft should not turn in the pilot bearing, so the fit needs to be 0.001 to 0.003" clearance in my opinion. I recently restored a worn journal on a transmission shaft with JB Weld. After curing, I abraded the JB Weld to a diameter that was a snug fit into the pilot bearing. I have 100 miles on this fix, and so far it is working (no clutch chatter).

 

[Patrick L.]

Seems if I remember correctly a generator bearing is the same. In case you have one hanging around.

 

[ponymare]

The input shaft does turn in the pilot bearing anytime the clutch is depressed, otherwise you can't get it in gear.

 

[Phil Brown]

The input shaft does turn in the pilot bearing anytime the clutch is depressed, otherwise you can't get it in gear.

That was ny first thought also but I think that Bob is correct in the close fit because it is a bearing not a bushing. So the rotational speed differences are made up in the bearing

 

[katy]

IIRC, the originals were a bronze bushing, so the shaft would have to have been able to turn:

 

[J Franklin]

There was a person at the Portland Oregon swap selling re-machined shaft journal to fit a MM inside diameter bearing. FYI the original pilot bearing was/is used in many applications and easy to source. It was the same in my '66 mustang 6 cyl, and old Ferguson tractor.

 

[Dick M]

An input shaft that is loose in the pilot bearing can and will cause your transmission to walk out of gear. It should be a machine fit, that is, no slop between the input shaft and the inner pilot bearing race...

 

[Jim Mason]

The originals were ball bearings.
The front generator bearing is the same.
6203 2rs is a replacement number




http://jmodela.coffeecup.com/bearings.html