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Old 01-19-2016, 10:41 PM   #1
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Transmission Leak at the shaft

Hi All,

Recently, the starboard transmission (BorgWarn) started to leak right at the flange where the shaft comes out. It was enough ATF loss that I was down to the 1/2 mark on the dip stick after six hours of motoring.

I guess it's a seal. Thoughts?

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Old 01-19-2016, 11:18 PM   #2
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Greetings,
Mr. CL. Sounds like a seal. I had had a leaking seal for a couple of years that I finally changed. NOT a big job. Two things I can suggest: 1) Make a piece of angle iron with two drilled holes that you can bolt onto your flange, using two adjacent bolt holes, for removal and tightening that big nut you'll find holding the flange half onto the transmission. 2) Beg, borrow or steal a LARGE socket and breaker bar for removal/replacement (and proper torque) of aforementioned nut.
Partially drain fluid out of the transmission so as not to slop fluid all over your bilges (have lots of diapers handy). Get a tube of RTV silicone, yes, silicone (I don't believe I just said that) for sealing the nut upon re-assembly.
Took me about 2-3 hrs of easy work. Next time it should go a lot faster.
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Old 01-19-2016, 11:59 PM   #3
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Rear seal.
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Old 01-20-2016, 12:45 AM   #4
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RT, I'm gobsmacked! You actually advocated the use of the dreaded s...s...s... I can't say it!
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Old 01-20-2016, 06:46 AM   #5
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Pack the entire coupler cavity with RTV, put on new nut and torque to 200 pounds or as close as you can get then spread the rest of the RTV over the nut. It is a one-time nut and cannot be reused.
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Old 01-20-2016, 09:35 AM   #6
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Pack the entire coupler cavity with RTV, put on new nut and torque to 200 pounds or as close as you can get then spread the rest of the RTV over the nut. It is a one-time nut and cannot be reused.
Or you could just replace the seal.
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Old 01-20-2016, 09:43 AM   #7
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Sometimes nut loosens, and it leaks through the splines and threads. If you can pull back shaft easily, check for a loose nut.
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Old 01-20-2016, 11:14 AM   #8
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Might want to check the shaft for alignment, after repairing the leak.
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Old 01-20-2016, 11:17 AM   #9
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The coupling comes off to replace the seal.
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Old 01-20-2016, 11:46 AM   #10
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Quote:
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The coupling comes off to replace the seal.
The shaft coupling and shaft have to be moved back out of the way either way.

Unless you are talking about the flange on the end of the transmission that the coupling attaches to.
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Old 01-20-2016, 08:41 PM   #11
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Gentleman,

Thanks all for the feed back.

Should I replace both while I'm doing the repair or just wait and see if ever needed?
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Old 01-20-2016, 09:08 PM   #12
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I`d wait and see. Look for reasons one seal failed, old age, misalignment, in my case a bent shaft. You do need to realign.
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Old 01-20-2016, 09:10 PM   #13
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Greetings,
Mr. CL. Buy 2 seals, do the leaking one now. If and when the time comes to do the other, you will have the tools (hopefully), the part and the know-how. If you never have to do the other side, what have you lost? $10?
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Old 01-20-2016, 11:40 PM   #14
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Location of leak



Capt Bill,

That's where it is leaking from, at the flange that is bolted to the shaft. See photo, leaking at the blue tape.
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Old 01-21-2016, 05:29 AM   #15
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Sounds like the fluid is migrating along a gap between the shaft and coupler. Perhaps through the key way.
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Old 01-21-2016, 09:50 AM   #16
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But you still think it's the rear seal?
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Old 01-21-2016, 10:07 AM   #17
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But you still think it's the rear seal?
I would say that it is.
Although it is possible that the oil is following the shaft splines and coming out at the nut. But once you are there the seal is easy to change.

If you would like a copy of the BW repair manual in pdf send me your e address.

jleonard@globalsteering.com
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Old 01-21-2016, 10:16 AM   #18
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The shop manual says the coupling nut must be replaced when the seal is replaced. Torque is 220 to 260 ftlb. If ordering a new seal will also need a new coupling nut.
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Old 01-21-2016, 11:21 AM   #19
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But you still think it's the rear seal?
Yes. Unless you can see/find another source for the oil you see.

That is one reason I like running ATF in those transmissions. You can tell right away by the color of that is the source of a leak.
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Old 01-21-2016, 11:28 AM   #20
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BW manual.

Quote:
Originally Posted by jleonard View Post
I would say that it is.
Although it is possible that the oil is following the shaft splines and coming out at the nut. But once you are there the seal is easy to change.

If you would like a copy of the BW repair manual in pdf send me your e address.

jleonard@globalsteering.com
Great! I will send an email this morning.

Thanks,
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