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Old 28-03-2010, 15:25   #1
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V-Drive / Perkins 4-108

Hello

I am losing -- actually lost 3X over now -- all my transmission fluid into the bilge. It appear to be draining from where the shaft goes into the V drive right where there is a large orange colored / seal/ disk/ thingy (about 1 inch thick). I can see no way to get to that area to service it. If I fil the transmission with 2.7 Qts, it is all drained in about 12-18 hours. I have lost about 9 quarts so far.

Is there a manual for these types of transmissions? I suspect the set up is the original -- all appears heavily corroded. The lines and elbow fittings that go to the cooler from the transmission are not the source of the leak. I do not know for sure where the source is -- it only appears to be coming from that area because I can see the drips hit the pool of oil as if coming from that junction area.

What am I looking at?

Thanks

Michael
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Old 28-03-2010, 15:40   #2
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here is a leak for the Vee Drive hope it helps.Walter V-drive Manual


Dutch
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Old 28-03-2010, 15:44   #3
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Thanks johnar -- I am not even sure what type of V drive I have. Looking at the manual thread here - the one link that seems to have the right manual is "locked". Appreciate the link -- am looking at the drawings now.
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Old 28-03-2010, 15:56   #4
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Photo

Here is a shot of the suspected area...
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Old 28-03-2010, 17:11   #5
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That "orange disk thingy" is your drive coupler...there is a seal in the blue painted part ...you will have to pull it apart to get at it.

Possible to do in the water but in your case i recommend getting hauled or have it professionally done.

Nice avatar picture!
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Old 28-03-2010, 18:55   #6
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Hello Michael,
Bummer! No doubt that the SEAL on the output shaft of the gearbox is shot.
This is a spring loaded rubber seal that is contained in a small housing at the aft end of the gearbox.

Depending on space - if you can lift the engine - this SEAL replacement can be done without taking it out of the boat. The gearbox output shaft flange is separated from the red flexable coupling - then the prop shaft and coupling are moved aft -'as far as possible'
I have taken your excellent photo and added information which will point out exactly where the offending seal is located - once you have got it out - take it to a motor parts shop and get an inexpensive replacement.
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Old 28-03-2010, 19:16   #7
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Michael,
BTW I guess that your V drive is a Borg-Warner Velvet Drive 71 & 72 Series.
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Old 28-03-2010, 19:42   #8
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Is it just me, that angle of the shot,.. or there a big misalignment here?
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Old 28-03-2010, 20:25   #9
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Minggat, I had similar thoughts - then measured the angles - perspective gives wrong impression. Might be a tad off, but will need feeler gauge to confirm. In any event will require re-aligning when repairs are complete.
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Old 29-03-2010, 04:19   #10
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Alignment

Minggat,
my curiosity got the better of me - so took Michael's photo and rotated it until the prop shaft was more or less horizontal. then took a line through the centre of the shaft to the gearbox flange. It more or less confirms that there is no problem facing Michael when it comes to re-aligning gearbox to prop shaft.
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Old 29-03-2010, 13:47   #11
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It will be necessary to provide a space of at least 12 " (305mm) between the prop shaft and the transmission's output shaft flange - this is space to be gained by moving the prop shaft aft and the transmission forward. Only then can the output shaft in it's housing be removed - it's total length is around 12 inches. It may practical to take this removed sub-assembly to a machine shop, as it may be necessary to hydraulically pull off bearing/s from the shaft to get at the problem seal (the part number for the seal should be 71C-110)
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Old 30-03-2010, 19:39   #12
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A little extra lateral thought after looking at the parts for the Borg Warner V Drive gearbox (IF it is one) provides a slightly easier method of getting at the seal to replace it (without have to move the engine) - here is a photo of the Flange Coupler which is female splined to take the male splined output shaft. The Flange is is held in position by a large NUT. If the prop shaft together with the red flexable coupling is moved aft only sufficiently far to allow a socket wrench (spanner) to fit over the NUT thus to remove it, allowing the flange to be pulled off the output shaft. At that point one maybe be able to ascertain placement of the SEAL. Then by removing the housing one should be able to see the SEAL at the end of the shaft - remove it and replace it. At the same time check the visible bearing/s . Then re-install the housing, the flange, the NUT - reconnect the prop shaft. Done!
NB. It is possible that there two (2) SEALS - one on the coupling flange and the other on the end of the output shaft
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Old 30-03-2010, 20:31   #13
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Service Manual BW V drive

Michael,
If you have the Service Manual for the Borg Warner V drive series 71 & 72
Go to page 43 step 15 -
Earlier we mentioned part no # 71C-110 that is correct for the older models.
The newer models list the part number fot the SEAL as # 1000-044-017.
Have a good read of the appropriate sections - the SEAL replacement may turn out to be much easier than originally thought.
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Old 30-03-2010, 21:45   #14
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For some reason the Service manual pdf did not load, In the meantime here is the link to the BW OWNERS OP manual which has a little info - i will try and get the link to the service manual:- http://www.mv-dreamer.com/VelvetDriveOwnersManual.pdf
The Service manual fot the Direct BW 71/72 series is to be found here:-
http://www.motoren.ath.cx/download.p...ice_Manual.pdf
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Old 30-03-2010, 23:26   #15
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Additional info

here is parts and listing for the SEAL - the seal is number #5 :-
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