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GEN1 AT AW372 Manual Shaft Seal Replacement #1105686 08/31/20 04:34 AM
Joined: Apr 2018
Posts: 105
C
chadzeilenga Offline OP
Wheeler
Hi All,
I'm chasing down a small leak in my 89 LWB with an AW372 automatic transmission. I thought it might be my pan gasket, but all the bolts were pretty snug when I removed, so now I'm looking above it for a possible leak source. I get a very small puddle (3" dia) after it sits for ~1wk. The farthest forward I can see any wetness is near the Manual Shaft (shifter shaft) and according to the FSM (pg 21-140) there appears to be a seal on each end of this shaft.

Has anyone replaced these seals with the transmission in the vehicle?
What tool did you use to do it? I have seen some generic tools at Napa that claim to be for this (Balkamp BK 7769250), but don't know if they will work

This leak started a while ago after I had overfilled the trans after a drain & fill of the fluid. I've been dealing with the leak and finally got around to investigating further. The drips are typically coming from the passenger rear area of the transmission, but I can't tell if that is just where the accumulation is as the drip is extremely slow.

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Chad Zeilenga
1989 Gen 1 Montero
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Re: GEN1 AT AW372 Manual Shaft Seal Replacement [Re: chadzeilenga] #1105690 09/06/20 02:44 AM
Joined: Feb 2001
Posts: 2,340
MarkG Online Content
Body Damage is Cool
*****
One way to track down small leaks ......
Clean the area with a good degreaser. Drive the rig a bit. Use some fine powder (like talc, etc) to dust the area. The power will not stick to the cleaned areas. But, it will stick to the areas that have oil. This will let you track down a small leak that is difficult to do otherwise.


Mitsu # 6 - 98 6G72 Montero Sport, R D Lock, 31x10.5

Mitsu # 7 - 02 6G74 Montero Limited
Re: GEN1 AT AW372 Manual Shaft Seal Replacement [Re: MarkG] #1105692 09/06/20 03:52 AM
Joined: Apr 2018
Posts: 105
C
chadzeilenga Offline OP
Wheeler
Hey Mark,
That is a good idea. I have a fresh pan gasket and the manual shaft seals installed, I think the other possible culprit is the PTO cover


Chad Zeilenga
1989 Gen 1 Montero
Re: GEN1 AT AW372 Manual Shaft Seal Replacement [Re: chadzeilenga] #1105693 09/09/20 02:19 PM
Joined: Feb 2001
Posts: 2,340
MarkG Online Content
Body Damage is Cool
*****
I can't credit for the idea. I first heard this from FastEddy.


Mitsu # 6 - 98 6G72 Montero Sport, R D Lock, 31x10.5

Mitsu # 7 - 02 6G74 Montero Limited
Re: GEN1 AT AW372 Manual Shaft Seal Replacement [Re: chadzeilenga] #1105716 09/22/20 04:04 PM
Joined: Feb 2005
Posts: 7,312
rxinhed Offline
Trail Leader
*****
He continues to provide good advice.








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