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Leaking T-10 Transmission

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Old 07-22-2010, 08:41 AM   #1
Pierre
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Default Leaking T-10 Transmission

I have a 62/63 first generation T-10 in my í57. I have had this transmission for three years (3000 miles) and never had a problem, until recently. I am using non synthetic 89/90 GL5 gear lube.

I am now having a fluid leak at the input shaft. The transmission was taken out , the front retainer and bearing removed but I canít find nothing obviously wrong at the input shaft, there are no front seals on these transmissions. It was carefully reassembled using sealer behind the bearing retainer. I reinstalled the transmission but Iím still having a smaller leak at the same location. I spoke to the vendor who sold me the transmission and he suggested I use 90/140W oil and a bearing with a built in shield??
Has anyone ever had similar problem with a T-10?
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Pierre
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Old 07-22-2010, 11:07 AM   #2
Dan Hampton
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Did you use silicon sealer on the retainer cover bolts? That could be your problem. They do not go into a blind hole, but rather, extend into the case. I would look there for the source of your leak.

Last edited by Dan Hampton; 07-22-2010 at 11:10 AM.
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Old 07-22-2010, 11:36 AM   #3
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Quote:
Originally Posted by Dan Hampton View Post
Did you use silicon sealer on the retainer cover bolts? That could be your problem. They do not go into a blind hole, but rather, extend into the case. I would look there for the source of your leak.
Yep, put sealant on the bolts for the front bearing retainer (oh ya, make sure the threads in the case are clean and dry first).

As far as I know, there is not such a thing as a front bearing with a seal for hese trannys (that 5th hole at the bottom is for oil drain back into the case).

If your alum T-10 has a snap ring to retain the front bearing on the input shaft, it's a 62-earlier. If it has a LEFT HAND THREADED gland nut, then it's a 63-later T-10.

Tom Parsons
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Old 07-22-2010, 11:53 AM   #4
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Yep, put sealant on the bolts for the front bearing retainer (oh ya, make sure the threads in the case are clean and dry first).

As far as I know, there is not such a thing as a front bearing with a seal for hese trannys (that 5th hole at the bottom is for oil drain back into the case).

If your alum T-10 has a snap ring to retain the front bearing on the input shaft, it's a 62-earlier. If it has a LEFT HAND THREADED gland nut, then it's a 63-later T-10.

Tom Parsons
Good point on the gland nut, Tom. I couldn't remember the first year of its use on the T-10.
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Old 07-22-2010, 01:01 PM   #5
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Quote:
Originally Posted by DZAUTO View Post
Yep, put sealant on the bolts for the front bearing retainer (oh ya, make sure the threads in the case are clean and dry first).

As far as I know, there is not such a thing as a front bearing with a seal for hese trannys (that 5th hole at the bottom is for oil drain back into the case).

If your alum T-10 has a snap ring to retain the front bearing on the input shaft, it's a 62-earlier. If it has a LEFT HAND THREADED gland nut, then it's a 63-later T-10.

Tom Parsons
This has gotten this old plant engineer thinking. Dangerous I know.

I would expect an open ball bearing to let gear oil migrate out the end.

Why not sub in a bearing with a snap ring and shield or seal? Unless it is a non standard size, most 100, 200, 300 and 400 series bearings are available off the shelf with a combination of seals, shields and snap ring.

What size (O.D., I.D., Width) is the bearing? Do you have a mfgr's number?
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Old 07-22-2010, 05:52 PM   #6
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If the drain channel cast into the back side of the front bearing retainer is blocked, and/or the drainback hole in the front of the case it feeds is blocked, you'll eventually wind up with gear lube in the clutch.

Photos are a Muncie, but T-10's are the same design.
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