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Front Pump Seal Leak on new Seal
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Myke
Posted 2023-04-24 10:48 PM (#629114)
Subject: Front Pump Seal Leak on new Seal



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Posts: 1110
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Location: Tulare Ca
Hey all,

I tracked down the source of my preview Torqueflite woes to a leaking front pump seal, I took the advice of 56D500boy's Post about leaky torqueflites and replaced the seal with SKF 21098 from RockAuto.
After finally getting it all back together I took it for a trip a noiced the leak was back and just about as bad as ever. Crawled under and confirmed that its stil coming from the front pump seal.

HOWEVER I noticed it now only leaks when the fluid is hot and thin. I let it idle in the driveway after letting it sit overnight for about 20 min, with no issues, but once i drove it fora bit and got the fluid hot, it started to leak. Does anyone have anysuggestions to where to start next? I really dont want to replace it again for no reason if there the possibility that the solution is something else?

Could it be that the fluid is just too thin overall? I know its currently an Unholy mix of Dex 4, Universal and Type F (a result of taking what i could get in an emergency on the way home a while back, as I was loosing so much before i took it apart)

I dont have any other issues now other than this leak. Car goes into gear and drives just fine...when the fluid level stays correct....


Any advice appreciated!
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57chizler
Posted 2023-04-25 1:10 PM (#629134 - in reply to #629114)
Subject: RE: Front Pump Seal Leak on new Seal



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Location: NorCal

Are you absolutely sure the leak originates at the seal? Did you inspect the pump drive sleeve for wear at the seal lip? If the new seal is hammered in, it's possible to dislodge the garter spring behind the seal lip and it will leak worse than before...I always pack the spring with heavy grease to prevent that.
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Myke
Posted 2023-04-25 1:50 PM (#629136 - in reply to #629134)
Subject: RE: Front Pump Seal Leak on new Seal



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Posts: 1110
1000100
Location: Tulare Ca
Yes, It's definitely coming from that seal, I Put her up on Ramps and got under there while it was running. I could see the Fluid streaming down from the seal. The garter spring thing could be a possibility as I didn't know until afterwards that I could pack it with grease and I did Put it in with a ball peen hammer... Looks like it's gonna have to come apart again

Would it harm anything to put some RTV around the outside of the seal after it's driven in to try to make sure it's not leaking around the metal of the seal?

Edited by Myke 2023-04-25 2:26 PM
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wizard
Posted 2023-04-25 4:16 PM (#629138 - in reply to #629114)
Subject: Re: Front Pump Seal Leak on new Seal



Board Moderator & Exner Expert 10K+

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Location: Southern Sweden - Sturkö island
If the transmission was installed without guide studs there's a huge risk that the seal was cut by the drive sleeve.
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Shep
Posted 2023-04-25 5:00 PM (#629144 - in reply to #629138)
Subject: Re: Front Pump Seal Leak on new Seal



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Location: Chestertown, NY ( near Lake George)
Agreed common issue..
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Myke
Posted 2023-04-25 5:40 PM (#629149 - in reply to #629138)
Subject: Re: Front Pump Seal Leak on new Seal



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Posts: 1110
1000100
Location: Tulare Ca
wizard - 2023-04-25 1:16 PM

If the transmission was installed without guide studs there's a huge risk that the seal was cut by the drive sleeve.


Does this apply if I pulled the Engine out instead rather than drop the trans and removed/reinstalled the torque converter by hand? that being said I was struggling to to put the TC in as it took me a few tries to get it to line up correctly
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Shep
Posted 2023-04-25 6:05 PM (#629152 - in reply to #629149)
Subject: Re: Front Pump Seal Leak on new Seal



Expert

Posts: 3393
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Location: Chestertown, NY ( near Lake George)
Could be, all the mating components need lube on them and be in good alignment.
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Myke
Posted 2023-04-26 2:57 AM (#629164 - in reply to #629152)
Subject: Re: Front Pump Seal Leak on new Seal



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Posts: 1110
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Location: Tulare Ca
Shep - 2023-04-25 3:05 PM

Could be, all the mating components need lube on them and be in good alignment.



Ok good to know, So any particular grease i need to use when assembling them? Will regular old high temp red grease be a problem with the ATF in any way?

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wizard
Posted 2023-04-26 6:28 AM (#629167 - in reply to #629149)
Subject: Re: Front Pump Seal Leak on new Seal



Board Moderator & Exner Expert 10K+

Posts: 13045
500050002000100025
Location: Southern Sweden - Sturkö island
Myke - 2023-04-25 11:40 PM

wizard - 2023-04-25 1:16 PM

If the transmission was installed without guide studs there's a huge risk that the seal was cut by the drive sleeve.


Does this apply if I pulled the Engine out instead rather than drop the trans and removed/reinstalled the torque converter by hand? that being said I was struggling to to put the TC in as it took me a few tries to get it to line up correctly


Yes, the guide studs are always needed for to aviod damage the seal and/or the drive sleeve. You can use automatic fluid or silicon grease.
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Myke
Posted 2023-05-03 2:46 PM (#629303 - in reply to #629114)
Subject: Re: Front Pump Seal Leak on new Seal



Elite Veteran

Posts: 1110
1000100
Location: Tulare Ca
Hey All, on Sunday I finally discovered the actual culprit, it seems at some point, Likely when the engine was pulled a a while back for a rebuild it seems as though something smacked the machine surface on the torque converter, lifting the seal and also trashing it.

I was able to have it machined and polished down, going to reinstall today.



(20230429_184529.jpg)



Attachments
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Attachments 20230429_184529.jpg (147KB - 50 downloads)
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