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Old 08-06-2007, 16:26   #1
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Shaft Keeps Spinning

I have a Perkins 4-107 and a Borg Warner Velvet Drive gear box. I'll need to look up which model this weekend. My problem is, is that the gear box still spins the shaft even in nuetral at idle speed. I can stop it with my shoe , but I can feel the friction as it tries to rotate. Is their an adjustment for this? Oil too thick? If I raise the rpms it will stop.

What say all of you?
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Old 08-06-2007, 17:08   #2
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happened with my old 4-108 and the same tranny all the time and the thing just kept running with no problems for years.
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Old 08-06-2007, 17:35   #3
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It provides just enough thrust that I can't hold a still position in the water and keeps the speed up when I approach a dock. Other than that, it's freaking great.
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Old 08-06-2007, 17:45   #4
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There are brakes for prop shafts available. Either mechanical or electrical solenoid actuated.

But I would check the spec's on your tranny oil.
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Old 08-06-2007, 18:41   #5
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It's normal. Not much you can do about it unless you fit a shaft brake. But it doesn't damage anything. The velvet drive can also be quite happily free wheeled while sailing.
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Old 08-06-2007, 21:03   #6
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Quote:
Originally Posted by delmarrey
There are brakes for prop shafts available. Either mechanical or electrical solenoid actuated.

But I would check the spec's on your tranny oil.
Your thinking it may be heavy/thick. Allighter oil or going to an ATF? Can I use an ATF?
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Old 08-06-2007, 21:32   #7
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It should be ATF. What are you using???
No... let me retract and rephrase that. It should be whatever is specified in your users manual. Check the manual first. But I would think it should say ATF.
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Old 08-06-2007, 21:34   #8
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I don't know which series you have but they normally run an ATF fluid. Which one do you have???

Here is a pfd for a 70C & 71C series. Look on page 21 & 22

http://mysite.verizon.net/vze6mxo8/d...erv_Manual.pdf
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Old 08-06-2007, 22:11   #9
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[quote=delmarrey]I don't know which series you have but they normally run an ATF fluid. Which one do you have???

Here is a pfd for a 70C & 71C series. Look on page 21 & 22

http://mysite.verizon.net/vze6mxo8/d...erv_Manual.pdf[
/quote]

Del - The file is password protected. Could you remove the password or share it with me?
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Old 08-06-2007, 22:13   #10
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Quote:
Originally Posted by Alan Wheeler
It should be ATF. What are you using???
No... let me retract and rephrase that. It should be whatever is specified in your users manual. Check the manual first. But I would think it should say ATF.
Last time I checked it it look like a 30wt or regular motor oil. Could that be the problem. Not enough vecosity?
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Old 08-06-2007, 22:32   #11
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From my 70C and 71C (a very early) Service Manual, "The properties of the oil used in the transmission are extremely important to the proper function of the hydraulic system. Therefore, it is extremely important that the recommended oil, Automatic Transmission Fluid (ATF), Type "A", Suffix "A", be used.
The later manual says, "Dexron, Type F, or any hydraulic fluid which meets the C-3 oil specification is acceptable. Do not mix different brands. If engine doesn't exceed 3,000 R.P.M., a premium grade 30 weight engine oil is acceptale. SAE #40 and multi-viscosity oils are not recommended."
The later manual was published in August 1988.
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Old 09-06-2007, 08:14   #12
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Del - Thanks fo the manual. I am going to buy some new coolers an replace te oil with ATF. I'm hoping this cures my problem.
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Old 09-06-2007, 08:53   #13
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I used Dextron II in the previous Boat BW VD and also in the Twin BW VD drives I have now. Check that the neutral is really neutral I had a problem once with a detented Hydropneumatic Clutch control where the system would creep out of neutral slightly because of pressure changes in the shifting system. It dosen't take much movement to get the shaft turning. I found that this shaft rotational creep also happened when the oil got dirty, or comprimised. The previous transmission was a 71 I haven't noticed any of this happening yet on the present ones which are 71C 's maybe things were improved.
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Old 13-04-2010, 16:50   #14
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propshaft

Maddog,

I have the exact same problem. Did you ever fix it? Or are you dealing with it?
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Old 13-04-2010, 17:15   #15
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I have a Perkins 4-108 and the shaft free wheels to. The engine has about 150 hours on it. I have thought, when cruising, to lock the shaft with a vicegrip. Maybe rig a quick release line with a big sign, "pull me before starting engine".
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