slight leak at pinion seal location - Team Camaro Tech
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post #1 of 19 (permalink) Old Jun 3rd, 19, 06:43 AM Thread Starter
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slight leak at pinion seal location

I replaced the pinion seal already along with a new bearing (outter I guess). I still have a slight leak. Any ideas ??? Pinion nut too loose ?

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #2 of 19 (permalink) Old Jun 3rd, 19, 08:00 AM
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Re: slight leak at pinion seal location

Did you put a little RTV or other sealant around the outside of the seal before driving it in? Did you seal the splines in the yoke before installing it? Did you put some grease or oil on the rubber lip of the seal before putting the yoke on? If this is a 12 bolt did you drive the seal in all the way against the flange?
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post #3 of 19 (permalink) Old Jun 3rd, 19, 08:18 AM Thread Starter
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Re: slight leak at pinion seal location

Quote:
Originally Posted by big gear head View Post
Did you put a little RTV or other sealant around the outside of the seal before driving it in? Did you seal the splines in the yoke before installing it? Did you put some grease or oil on the rubber lip of the seal before putting the yoke on? If this is a 12 bolt did you drive the seal in all the way against the flange?
Thanks for the reply Freddie. this is a 8.5 10 bolt. The only yes would be for grease the rubber lip. I'm certain the seal is all the way in. I guess I will have to try another seal.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #4 of 19 (permalink) Old Jun 3rd, 19, 09:44 AM
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Re: slight leak at pinion seal location

Gear oil may be seeping thru yokesplines that engage the pinion splines.

As Freddie already mentioned... When reinstalling the pinion yoke, be sure to but a little RTV sealant on the YOKE splines that engage the pinion splines to keep gear oil from seeping out thru the splines. DO NOT put any RTV on the pinion splines... as the yoke will push the RTV into the pinion bearing during installation.

How much torque did you use to tighten the pinion nut?
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post #5 of 19 (permalink) Old Jun 3rd, 19, 12:12 PM
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Re: slight leak at pinion seal location

around the 37 min mark talks about pinion seal
very good info

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Tremec TKO 600
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post #6 of 19 (permalink) Old Jun 3rd, 19, 12:58 PM Thread Starter
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Re: slight leak at pinion seal location

Quote:
Originally Posted by oldschoolchevy View Post
Gear oil may be seeping thru yokesplines that engage the pinion splines.

As Freddie already mentioned... When reinstalling the pinion yoke, be sure to but a little RTV sealant on the YOKE splines that engage the pinion splines to keep gear oil from seeping out thru the splines. DO NOT put any RTV on the pinion splines... as the yoke will push the RTV into the pinion bearing during installation.

How much torque did you use to tighten the pinion nut?
I marked the nut before removal and installed in the same position.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #7 of 19 (permalink) Old Jun 4th, 19, 06:15 AM
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Found this updated video from the one i posted above

https://youtu.be/eX-1MUTVnQ8
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Tremec TKO 600
Moser 12 bolt rear with ford ends 3.73:1 Eaton tru trac differential
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post #8 of 19 (permalink) Old Jun 4th, 19, 06:22 AM Thread Starter
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Re: slight leak at pinion seal location

Quote:
Originally Posted by stamatisg1977 View Post
Found this updated video from the one i posted above

https://youtu.be/eX-1MUTVnQ8
Thanks Steve, I have a 8.5 10 bolt. It appears the issue is with 12 bolt car/truck seals.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #9 of 19 (permalink) Old Jun 4th, 19, 07:34 AM
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Quote:
Originally Posted by DT View Post
Quote:
Originally Posted by stamatisg1977 View Post
Found this updated video from the one i posted above

https://youtu.be/eX-1MUTVnQ8
Thanks Steve, I have a 8.5 10 bolt. It appears the issue is with 12 bolt car/truck seals.

Np good luck
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Tremec TKO 600
Moser 12 bolt rear with ford ends 3.73:1 Eaton tru trac differential
Speedtech pro touring subframe
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post #10 of 19 (permalink) Old Jun 4th, 19, 08:47 AM
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Re: slight leak at pinion seal location

Just a quick note to anyone that may be replacing the pinion seal in a Chevy 12 bolt rear.
About 2 years ago, I was looking into this exact issue when I was rebuilding my 12 bolt rear. I posted on this subject within this forum. This is a recap out what I found out.

The Ratech 6109 pinion seal will work on a Chevy 12 bolt "car" rear without having to shim out the seal.
As shown in the photos below, the Ratech 6109 pinion seal (BLUE Seal) is shorter than the truck 12 bolt seal (GREEN Seal) and the seal portion of the Ratech 6109 pinion seal also sits higher in the housing than the truck 12 bolt seal.





In my original post, I also discussed how I used some header collector gaskets as a spacer to install the truck 12 bolt seal into the 12 bolt rear.
Below is a link to the original post. Post #16 provides a lot of details.
https://www.camaros.net/forums/27-tr...-question.html

Below is a link to the Ratech 6109 pinion seal.
https://www.summitracing.com/parts/rat-6109
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post #11 of 19 (permalink) Old Jun 25th, 19, 08:37 AM Thread Starter
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Re: slight leak at pinion seal location

I removed the pinion yoke and sealed the splines. Same seal installed. I still have a slight leak. Weird, the oil is on the u-joints (slight leak) as if the leak is coming from the nut/washer/splines area. It is dry as a bone around the housing.

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #12 of 19 (permalink) Old Jun 25th, 19, 10:04 AM
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Re: slight leak at pinion seal location

sounds like you need more/different RTV on the pinion splines. Permatex Black "ultra" is more suited to oil sealing than other types of RTV.

...or maybe the splines were still coated with gear oil preventing the RTV you used from sealing well. Pulling the diff cover and draining gear oil then hitting splines with brake cleaner may allow the RTV to seal....assuming the current RTV sealing is compromised
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post #13 of 19 (permalink) Old Jun 25th, 19, 12:44 PM
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Re: slight leak at pinion seal location

Is it actually coming from the u joint? Grease can separate in the u joint and leak out like oil. Be sure that it's coming from the pinion nut area before taking it apart again.

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post #14 of 19 (permalink) Old Jun 25th, 19, 01:27 PM Thread Starter
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Re: slight leak at pinion seal location

Quote:
Originally Posted by big gear head View Post
Is it actually coming from the u joint? Grease can separate in the u joint and leak out like oil. Be sure that it's coming from the pinion nut area before taking it apart again.
Thanks Freddie. Yeah, it sure seems like its coming from the pinion nut area. Its dry by the pinion flange by the housing. I mean I don't hear any noise or anything. The first seal I changed I had to replace the pinion bearing. I wonder if the inner bearings need replacement??

1969 X66 396 LeMans Blue, M20, 373 (Sold)
1969 Convertible LS3 TKO 600, 373
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post #15 of 19 (permalink) Old Jun 25th, 19, 04:39 PM
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Re: slight leak at pinion seal location

Seems like you didn't get the splines sealed well enough. Did you use RTV or thread sealant? I usually use RTV because it's easier, but GM used thread sealant. You might try that. Be sure to use enough in the yoke that it pushes it up under the washer when you put the yoke on. Use your finger to work it into the splines in the yoke. When the yoke is on you should have a nice even bead all the way around the open area under the washer.

Just be careful if you use any brake cleaner on the pinion splines. Do not let any of it get inside the housing. It can cause the oil to break down and cause more problems. You can not get it out unless you disassemble the whole rear end.
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Last edited by big gear head; Jun 25th, 19 at 05:09 PM.
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