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727 leak
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   Forward Look Technical Discussions -> Transmission and Rear AxleMessage format
 
plymouth
Posted 2019-10-05 9:58 AM (#588433)
Subject: 727 leak



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Posts: 2223
2000100100
Location: McComb, Mississippi
My 63 Imperials Torqueflite has a small leak after I park the car. It's dripping from the pan rail, but is not the pan. So far, I've replaced the torque converter seal, speedometer seal , kickdown linkage seal, pushbutton and park cable seals, NSS seal, and dipstick tube seal. I've made sure the pan flange is straight and put heat shrink tubing on both cables. From what I can tell, the leak appears to be originating from the back half of the trans. I have confirmed that the tailshaft seal is not leaking. Any ideas where else to check? Thanks

Edited by plymouth 2019-10-05 10:00 AM
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Shep
Posted 2019-10-05 11:40 AM (#588440 - in reply to #588433)
Subject: Re: 727 leak



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Posts: 3130
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Location: Chestertown, NY ( near Lake George)
May be worth getting a leak detector dye kit, to pinpoint the source. You have covered the usual suspects, may be in the casting somewhere.
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57chizler
Posted 2019-10-05 4:07 PM (#588447 - in reply to #588433)
Subject: RE: 727 leak



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Posts: 3264
200010001001002525
Location: NorCal
One of the most insidious 727 leaks is the rear band lever pivot shaft; this shaft has an O ring that leaks out onto the pan rail and appears to be coming from the pan gasket. Unfortunately, on the pre-'66, the end of the pin is hidden in front of the Park module and can't be accessed without removing the tail housing. An additive like Lucas or Trans-X might stop the leak.



(Rear Band Pin.jpg)



Attachments
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Attachments Rear Band Pin.jpg (59KB - 4 downloads)
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plymouth
Posted 2019-10-05 6:31 PM (#588450 - in reply to #588447)
Subject: Re: 727 leak



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Posts: 2223
2000100100
Location: McComb, Mississippi
I didn't even know there was a seal back there. I bet that's the culprit. I may get the dye and confirm that. Thanks
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57chizler
Posted 2019-10-06 6:19 PM (#588484 - in reply to #588450)
Subject: Re: 727 leak



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Posts: 3264
200010001001002525
Location: NorCal
Here's what the shaft and O ring look like, leaks here are so common that in later years they added a second O ring.



(Rear Band Lever Pin.JPG)



Attachments
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Attachments Rear Band Lever Pin.JPG (152KB - 5 downloads)
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plymouth
Posted 2019-10-06 6:45 PM (#588487 - in reply to #588484)
Subject: Re: 727 leak



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Posts: 2223
2000100100
Location: McComb, Mississippi
Hmmmm.. well, since I don't really want to pull the pan again, I might just drain a little fluid out, clean around that shaft with brake cleaner and use a little Ultra Gray.
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57chizler
Posted 2019-10-07 2:15 PM (#588516 - in reply to #588487)
Subject: Re: 727 leak



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Posts: 3264
200010001001002525
Location: NorCal
That's the procedure I recommend but access if pretty limited. There is a tab on the tailhousing to prevent the shaft from coming out; if you can, push the shaft forward as far as possible to make room for mo9re sealer.
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