65 396

Is there a lip seal that goes inside the front input shaft bearing retainer on an M20 to prevent oil from leaking when the transmission is tilted forward? I removed mine and expected to find a seal but there was none.

JohnZ

No. There's no front seal in the bearing retainer in any Muncie or T-10. The bearing retainer has an asymmetrical bolt pattern to the case (only goes on one way), and there's an internal groove that directs any excess lube back through a hole into the case.

65 396

Thank you John.

Avispa

Also notice the tapered, machined surface just outside the diameter of the shaft opening in the bearing retainer. That surface works with a similar tapered surface on the forward side of the main drive gear bearing retainer nut to keep oil out of the shaft opening.

domenic tallarita

If you notice the machined area just behind the taper. I once went to the bearing house with the size requirements and bought a seal that fit. It worked but I then learned that the leaks were from filling them to the bottom of the hole.
By the way the seal looked much like the one on the steering box, the one that leaks

65 396

Now I need to locate a tool to tighten that retainer nut. Where can I find that tool? There is very little room to get a tool on the nut so the tool must be very thin.

65 396

I measured the nut. It is 1.650" from side to side and it appears that the wrench cannot be over .175" thick.

JohnZ

It's also a left-hand thread.

DZAUTO

Here is the gland nut (left hand thread) and the required wrench.















The smooth side of the nut is what faces the corrosponding surface inside the bearing retainer shown above. When properly installed, the nut DOES NOT make contact with the bearing retainer. The outer diameter of the nut serves as an oil slinger. As oil comes off of the slinger, it moves down to the groove in the bearing retainer then drains into a return hole in the front of the case and back inside the case.

It is impossible to count the number of Muncies I've opened in the past 45+yrs that I've been rebuilding them, and discovered where a pipe wrench has been used to loosen/tighten the gland nut. Some nuts have been badly damaged/ruined by use of a pipe wrench and some have just had a few marks from the teeth of the pipe wrench. If you only rebuild a Muncie one time, you may not feel the price of the wrench is justified. The one in my picture above is second one I've bought. I wore out the first one, so mine have more than paid for themself.

rongold

Try an auto parts store that rents out tools. They may have a fan clutch wrench that will fit.

mrg

You can make a one time use 'wrench' out of a length of 1/8 thick 2"x2" angle stock. Measure across nut flats, cut notch in angle.

65 396

I was lucky enough to locate one of these wrenches on Ebay. I now own one of these and believe me, it worked great to tighten that input shaft nut. So, if anyone else needs one, you are welcome to borrow mine anytime. If you don't mind paying the shipping costs back and forth. Just let me know if you need it.[/QUOTE]