Seal Leak Won’t Stop Leaking - JeepForum.com
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post #1 of 35 Old 03-03-2019, 01:50 PM Thread Starter
Alabamacj71981
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Seal Leak Won’t Stop Leaking

Help. I’ve got a transfer case (Dana 300) that has a front drive shaft yoke seal that keeps leaking. I’ve replaced it 4 times. I’ve tried different brands, etc. It leaks where the output shaft goes through the rubber dual lipped hole of the seal. The leak generates about 50mL each night. It stays at this same rate. Any ideas? The pic below is old (things are cleaner now) but is representative of the new seal install direction and location.

Karl

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post #2 of 35 Old 03-03-2019, 02:13 PM
lacscam
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I can't tell from the picture, but when I replaced my seal, I put a thin skim coat of RTV on the outside of the seal. Additionally, I clean the splines and put a light coat of RTV on the splines as well.

Can you tell the source if the leak(splines, outside edge of seal, inside of seal)?
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post #3 of 35 Old 03-03-2019, 02:28 PM
Boojo35
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What does the surface of the yoke where it makes contact with the seal look like? Is it grooved or damaged in anyway?
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If you cannot fix it with a hammer then it has to be an electrical problem.
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post #4 of 35 Old 03-03-2019, 02:41 PM Thread Starter
Alabamacj71981
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I have used the recommended sand paper (doesn’t feel like sandpaper) to remove any issues and did not see anything on the outside of the yoke that would come into contact with the robber seal. This is where the leak is occurring. However, I might not have a trained eye for that sort of thing. I have tried single and dual lipped seals. I have tried lightly sanding for burrs. Also, tried greasing and not greasing the seal so I don’t fudge the lip of the seal when I slide in the yoke shaft.

I like that you guys are enlightening me that it could be the splines.

Thanks,

Karl
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post #5 of 35 Old 03-03-2019, 03:31 PM
jtec
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issue is the seal against the yoke, often the yoke will get a grove over time and our offroading dirt, sand etc not a kind environment, there are sleeves that press onto yoke sealing surface.

The older jeeps - sure the yoke is correct for this application - one of the challenges working on older vehicles. I think redi seal is a trade name seal/sleeve kit.

When I see the price of OEM I think aftermarket.
When I see the quality of aftermarket I think OEM.
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post #6 of 35 Old 03-03-2019, 03:39 PM
kovic
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Before I tore my jeep down that was leaking on mine also. It was caused by my U joints vibrating so bad and ruining the bearings. May want to check the shaft for play, may need new bearings.

kov
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post #7 of 35 Old 03-03-2019, 03:51 PM
Boojo35
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Quote:
Originally Posted by jtec View Post
issue is the seal against the yoke, often the yoke will get a grove over time and our offroading dirt, sand etc not a kind environment, there are sleeves that press onto yoke sealing surface.

The older jeeps - sure the yoke is correct for this application - one of the challenges working on older vehicles. I think redi seal is a trade name seal/sleeve kit.
Speedy sleeve is a name I have used in the past. Not sure if they are still around. They made a lot of harmonic balancer repair stuff.
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If you cannot fix it with a hammer then it has to be an electrical problem.
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post #8 of 35 Old 03-03-2019, 03:52 PM
Boojo35
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take pics of your yoke and post them if you do not have a trained eye.

If you cannot fix it with a hammer then it has to be an electrical problem.
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post #9 of 35 Old 03-03-2019, 04:29 PM
Rsb201
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Have you checked your transfer case vent?? A restricted vent will cause a seal to leak.
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post #10 of 35 Old 03-03-2019, 04:38 PM
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Question

Quote:
Originally Posted by Boojo35 View Post
What does the surface of the yoke where it makes contact with the seal look like? Is it grooved or damaged in anyway?
I'm with Boojo on this one. My thought on a constantly leaking seal, especially after having replaced the seal a few times, is a grooved yoke surface. It only takes a little reduction in gland (?) diameter to reduce the seal lip pressure a lot.

Inspect the seal/yoke contact surface carefully for a groove. Do you have any pictures of the yoke when it's out of the TC?

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post #11 of 35 Old 03-03-2019, 08:45 PM Thread Starter
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Great feedback. Here are some responses in no specific order:
(1) I’ll take some pics of the yoke next weekend. I’ll be on travel tomorrow for the work week.
(2) I just replaced my drive shaft u-joints in front and back so they have no play. The front drive shaft is not spinning. Confirmed by taking boot off of shifters and sneaking a peak while test driving. It is currently in two wheel high. The front drive shaft is able to be wiggled a little with the front dive shaft where the little segment meets the longer segment. Not sure what is normal.
(3) my TC air vent tube, I just replaced. It should be nicely breathing.
(4) I hope I don’t need new bearings...

Sounds like I should buy a new yoke but I will definitely send pics to this thread to learn the eye for issues. I think I can also clean the splines better. I’ll also research the other solution mentioned above if that treatment can save money.

Real great feedback. Much appreciated!
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post #12 of 35 Old 03-04-2019, 12:24 AM
LJameson
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If it is in fact the yoke, you donít need to replace it. Repair sleeves are readily available that are made to address this issue.
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post #13 of 35 Old 03-05-2019, 06:41 PM
importman
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How much lateral motion, (up and down) does the output shaft have? If the output shaft bushing is worn the excessive motion can cause the yoke to stretch the seal and leak in a very short time.
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post #14 of 35 Old 03-05-2019, 07:01 PM
astjp2
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Quote:
Originally Posted by jtec View Post
issue is the seal against the yoke, often the yoke will get a grove over time and our offroading dirt, sand etc not a kind environment, there are sleeves that press onto yoke sealing surface.

The older jeeps - sure the yoke is correct for this application - one of the challenges working on older vehicles. I think redi seal is a trade name seal/sleeve kit.
speedi sleeve... and I had one that was leaking between the splines and the nut/washer, they make a seal washer for that. Tim
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post #15 of 35 Old 03-05-2019, 09:22 PM
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have used speedi sleeve seal on full side trucks for over 25 years good deal looking back at pic looks as roller bearing how is yoke to spline fit slide on not move side to side or wiggle
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