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Old 02-09-2011, 12:33   #1
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Correct Transmission Sizing - What Is 'this?' [Pic]

Hi,

The transmission on my 32-foot steel sailboat needs to be rebuilt or replaced. Any help would be much appreciated.

The transmission is probably a Borg Warner - the plate says "BW tip 6" built by Industrias Subsidiarias de Aviacon (ISDA) Seville, Spain.

forward 2.0 backwards 1.76 (see attached photo).

If the transmission needs to be replaced, how can I be sure a Velvet Drive 71C In-line (for example) would be correct? For example, if the reduction cannot be exactly matched to the old transmission, how much can I go up or down?

Right now I'm in northern Newfoundland.

thanks for any help.

Dennison
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Old 02-09-2011, 12:49   #2
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Re: Sizing correct transmission. What is this?

ZF on the plate? There is a ZF bw6 transmission manual on line
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Old 02-09-2011, 13:08   #3
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Re: Correct Transmission Sizing - What Is 'this?' [Pic]

Thank you - this helps a lot. Will try to find the manual now and move forward from there.
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Old 02-09-2011, 17:58   #4
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ZF?

As I understand it all the more recent marine transmissions from ZF have one of a limited number of standard plates. It should be possible to work out which one suits your engine.

I'm in favour of oversizing the transmission if possible as a heavy cruising boat seems to put on a heavier load than the manufacturer expected.
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Old 02-09-2011, 18:00   #5
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Re: Correct Transmission Sizing - What Is 'this?' [Pic]

Many transmissions on production boats are really undersized. They are rated for intermittent use and run hot if you have to work them for to long.
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Old 06-09-2011, 08:17   #6
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Re: ZF?

Thanks for this. Rather than changing the transmission I'm looking whether a cooler would help. Anythoughts on that?
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Old 06-09-2011, 08:19   #7
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Re: Correct Transmission Sizing - What Is 'this?' [Pic]

Thank you. Do you think a cooler would help? I'm reluctant to start to trying to install a new transmission because everything takes a long long time here and supply lines are weeks long.
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Old 06-09-2011, 09:03   #8
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Re: Correct Transmission Sizing - What Is 'this?' [Pic]

I believe Velvet Drive is manufactured in the U.S.
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Old 06-09-2011, 09:17   #9
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Re: Correct Transmission Sizing - What Is 'this?' [Pic]

The BW 6 has an offset. That is to say the output shaft (to the prop) is lower than the input shaft. The BW Velvet drive 71 is an inline where the input and output shafts are in line. Compare your BW 6 to say a ZF 10. They have a similar offset if not the same and the same "Key hole mount on the bellhousing.

What is the Engine? Sole?
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Old 06-09-2011, 09:23   #10
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Re: Correct Transmission Sizing - What Is 'this?' [Pic]

Thank you for this - a step forward. Yes my transmission has an offset. I'd prefer to rebuild this one (so that i can be sure it fits) and add a cooler.

Two seasons I used the motor a lot - coming 300 miles through Trent-Severn Waterway in Ontario, Canada, and down the St. Lawrence Seaway from Toronto to Rimouski and on to Newfoundland.

The engine is an Isuzu 40 hp. (marinized).

Den
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