The Stovebolt Site Forums The Shop Area Driveline 318 Muncie 3 speed diagram

I have a 1950 3100 stock engine and 3 speed transmission that leaks oil.

I believe it is leaking from the front of the transmission.

I don’t believe there is a seal there, but how do you slow the oil leak.

Does someone have a good copy of the Muncie 318 exploded diagram?

Thank you.

There's no seal on the input shaft, but there is a gasket on the retainer that the throwout bearing rides on. Also, there's no gasket where the countershaft goes thru the front of the tranny case, but some sealant around the depression in the bell housing for that shaft can take care of potential leakage there.The countershaft also is exposed at the rear of the case, and may seep there if it's not real tight, but again, a little sealant can deal with that.

There's an exploded view in the service manual.

There is a bearing nut/oil slinger that is threaded on the front of the clutch gear and staked in place. There is also a corresponding tapered portion of the bearing retainer that is very close to the bearing nut but is not a contact surface. The idea is for whatever oil that passes through the bearing is directed into a passage in the bearing retainer and returned to the transmission case. I have found many of the bearing retainers and the bearing nuts excessively worn which allows for the oil to just run out the front. It is difficult to remove the nut without a special wrench so many use channel locks which dents the outside and causes metal transfer to the bearing retainer, thus the beginning of a problem. The bearing nut/slinger is left hand thread.
Fred

Can this special thin style wrench be found anywhere?

Kevin, thanks. I should have looked there first. This looks like a project I can take on. I went down to one of our local transmission shops and they quoted me $700. For that I'll give it a try.

I fabricated one from two pieces of flatstock I welded together then cut out the jaws to match the nut.