Military Vehicles, April 1997,: Re: [MV] T-84 Transmission Leak

Re: [MV] T-84 Transmission Leak

Jeff Polidoro (willys@vgernet.net)
Fri, 25 Apr 1997 17:02:14 -0400

The proper fix is a new (NOS can be OK depending upon how it was stored)
seal and new shaft without a wear groove or, as Dennis correctly stated,
alternatives (B) or (C). There is, however, an alternative (D) which while
not the best method, is preferable to just living with the seepage. If you
get a variety of the same seal from different manufacturers there is an
excellent chance that you will find one or more with a slightly different
method of manufacture or design which results in the wiping or sealing
surface contacting a different place on the worn shaft and not riding in
the original wear groove. Essentially, by riding on a "new" place on the
shaft the new seal doesn't know that the whole shaft is not new. If you
find more than one with a different profile, use the one which places the
new seal outboard of the groove for the marginal aestethic value.
Alternative (E) would be to accomplish the same offset by shimming the
seal out to misalign the sealing surface and wear groove. This is,
obviously, the least preferable method.

Regards

JP
----------
> From: DOConnor@zoomit.sikorsky.com
> To: mil-veh@skylee.com
> Subject: re: [MV] T-84 Transmission Leak
> Date: Friday, April 25, 1997 10:20 AM
>
> Jim,
> We've found this to be a common problem in MB/GPW's we know. There has
to
> be a seal of some sort where the shaft exits the case, I just don't have
the
> manuals here to look at the diagrams. The culprit in may cases is just
worn
> seals which you can get at NAPA. Always use new seals not N.O.S. because
the
> "New Old Stock" is going to be the same age as the "Nasty Old Stuff" it's

> replacing and won't do the job. We know this from hunting down all the
proper
> seals to do the trans and then redoing it with new NAPA parts when it
leaked
> worse than when it came out. The other problem common to these parts is
the
> shaft has a groove worn into it by the seal allowing it to seep out. Yes,

> rubber can wear steel after years of friction on the same surface!
(Commonly
> found on the harmonic balancers of 350 Chevy's is another good example)
The
> fix is A:) New Shaft B:) Grind shaft down and install sleeve to return to

> original size or C:) Weld the shaft and grind down to original size. Any
good
> machine shop that has experience turning cranks and cams can perform the
> service and "C" is the easiest and probably the cheapest.
>
> Good Luck,
> Dennis O'Connor
> Naugatuck, CT, USA
>
>
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