1967 muncie

[Randy K.]

i have oil seeping from the hole in the front of the main case where the shaft that holds the counter gear comes through. has anyone had this repair done and by who? thank you

[Joel A.]

Re: 1967 muncie

Silicon sealer works well there. Clean the area around the shaft with carb/brake cleaner to remove any oil, first. Then, a thin bead around the circumference of the shaft, and smoothed over with a putty knife/scraper will seal it without taking it apart, or doing any machine work. Just make sure the sealant is not allowed to dry before smoothing it out flat. I've been doing this on every rebuild I do on Muncies and T-10s for years, and it always stops the seepage.

[Tom P.]

Re: 1967 muncie

QUOTE: Silicon sealer works well there. Clean the area around the shaft with carb/brake cleaner to remove any oil, first. Then, a thin bead around the circumference of the shaft, and smoothed over with a putty knife/scraper will seal it without taking it apart, or doing any machine work. Just make sure the sealant is not allowed to dry before smoothing it out flat. I've been doing this on every rebuild I do on Muncies and T-10s for years, and it always stops the seepage. QUOTE

It stops the oil seepage-------------temporarily, but it DOES NOT fix the cause of the leak.
It is common, in time, for the cluster gear shaft to cause the front hole in the case to become enlarged. The nose of the shaft and the hole are tapered. When properly installed, this tapered shaft/hole forms a tight seal. With time, hard use and mileage, the shaft can move around and loosen this tight taper fit, thus an oil leak. The only sure cure is to either have the hole shrunk (if not enlarged too much) or have a bushing installed in the case.

[Jerry #1965]

Re: 1967 muncie

I didn't know that the hole and the shaft were actually tapered - I thought it was just a slight press fit ??
How do you shrink a hole ? In aluminum ?
I agree that the silicone cure is simply masking the problem of a stretched hole / loose fit, not remeding the situation.
On stretched cases I usually loctite the shaft with the case upside down, so as to locate the countershaft closer to it's intended location.
Jerry

[Randy K.]

Re: 1967 muncie

tom .i have heard of the bushings being installed but can't find any one who does it. do you know some one who does this repair?thanks,

[Bill Stephenson]

Re: 1967 muncie

------Randy,,,Got our 66 M21 done about 4 years ago. Local (good) trans guy took the trans apart and took the case to someone else in the Detroit area to be bushed. I am about 40 miles northest of Detroit. Re-bushing is the only correct way to repair your problem. E-mail if I can help........Bill S

[Page C.]

Re: 1967 muncie

Randy,
Another source to rebush the front hole is Larry Fisher. He has done one for me and I was very pleased and no more leaks.
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