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E36 M3 (1992-1999) {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999


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Old Tue, May-16-2017, 04:00:05 PM   #1
nholmes
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Question Transmission Advice (friend's trans)

So, we recently replaced the seal for the input shaft inside the bell housing in my friends ZF320 5 speed and it won't stop seeping fluid.

Has anyone experienced this before? What's the cause and best fix?

Thanks!
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Old Tue, May-16-2017, 04:15:37 PM   #2
j0rdan J
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Default Re: Transmission Advice (friend's trans)

Noah, try putting some "reinzoplast" or an equivalent product around the seal when you replace it again.

Thats what I use when I replace front or rear crankshaft seals and have never had them leak on me
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Old Tue, May-16-2017, 05:08:31 PM   #3
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Default Re: Transmission Advice (friend's trans)

I haven't checked the holes, but the guide tube bolts have a thread sealant on them. If they pass through you will get leaks through the bolts.
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Old Tue, May-16-2017, 06:00:32 PM   #4
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Default Re: Transmission Advice (friend's trans)

Quote:
Originally Posted by j0rdan J View Post
Noah, try putting some "reinzoplast" or an equivalent product around the seal when you replace it again.

Thats what I use when I replace front or rear crankshaft seals and have never had them leak on me
Where on the deal does this out? Along the outer edge?

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Originally Posted by Braymond141 View Post
I haven't checked the holes, but the guide tube bolts have a thread sealant on them. If they pass through you will get leaks through the bolts.
Good point. We'll check those.

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Old Wed, May-17-2017, 12:48:18 AM   #5
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Default Re: Transmission Advice (friend's trans)

Anaerobic sealant on outer circumference of seal won't hurt and might help. But I like the idea of first checking the guide tube bolts to see if they are leaking.

If you punctured the skirt behind the seal dont worry. That won't cause a leak if the seal is installed right and the guide tube bolts are installed right.
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Old Wed, May-17-2017, 02:06:08 AM   #6
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Default Re: Transmission Advice (friend's trans)

I remember reading something awhile back about installing the seal too deep in the case and causing it to leak. Did you install it to the same depth as the old one? I've never replaced mine because "if it ain't broke, don't fix it" attitude.
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Old Wed, May-17-2017, 04:42:35 PM   #7
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Default Re: Transmission Advice (friend's trans)

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Did you install it to the same depth as the old one?
It looked to be flush at the time of the install.
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Discussing Transmission Advice (friend's trans) in the E36 M3 (1992-1999) Forum - {Euro - S50 B32 321hp @ 7400 rpm} {U.S. - S52 B32 240 hp @ 6000 rpm}
Total Produced: 71,212 - Years Produced: 1992 to 1999 at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)