Cruisers Forum
 


Reply
  This discussion is proudly sponsored by:
Please support our sponsors and let them know you heard about their products on Cruisers Forums. Advertise Here
 
Thread Tools Search this Thread Rate Thread Display Modes
Old 02-09-2011, 11:33   #1
Registered User
 
OceansFive's Avatar

Join Date: Mar 2008
Location: Langkawi, Malaysia
Boat: Chevrier 36
Posts: 77
Images: 1
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
Attached Thumbnails
Click image for larger version

Name:	ISA.jpg
Views:	916
Size:	385.9 KB
ID:	31076  
__________________
Marine Diesel Basics - first VISUAL guides to marine diesel systems. marinedieselbasics.com
OceansFive is offline   Reply With Quote
Old 02-09-2011, 11:49   #2
Registered User
 
Blue Stocking's Avatar

Join Date: Dec 2008
Location: St. Georges, Bda
Boat: Rhodes Reliant 41ft
Posts: 4,131
Re: Sizing correct transmission. What is this?

ZF on the plate? There is a ZF bw6 transmission manual on line
__________________
so many projects--so little time !!
Blue Stocking is offline   Reply With Quote
Old 02-09-2011, 12:08   #3
Registered User
 
OceansFive's Avatar

Join Date: Mar 2008
Location: Langkawi, Malaysia
Boat: Chevrier 36
Posts: 77
Images: 1
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.
__________________
Marine Diesel Basics - first VISUAL guides to marine diesel systems. marinedieselbasics.com
OceansFive is offline   Reply With Quote
Old 02-09-2011, 16:58   #4
Moderator Emeritus
 
Boracay's Avatar

Cruisers Forum Supporter

Join Date: Feb 2004
Location: Sunshine Coast, Qld, Australia
Boat: CyberYacht 43
Posts: 5,174
Images: 19
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.
Boracay is offline   Reply With Quote
Old 02-09-2011, 17:00   #5
Registered User
 
DeepFrz's Avatar

Cruisers Forum Supporter

Join Date: Mar 2006
Location: Winnipeg
Boat: None at this time
Posts: 8,462
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.
DeepFrz is offline   Reply With Quote
Old 06-09-2011, 07:17   #6
Registered User
 
OceansFive's Avatar

Join Date: Mar 2008
Location: Langkawi, Malaysia
Boat: Chevrier 36
Posts: 77
Images: 1
Re: ZF?

Thanks for this. Rather than changing the transmission I'm looking whether a cooler would help. Anythoughts on that?
__________________
Marine Diesel Basics - first VISUAL guides to marine diesel systems. marinedieselbasics.com
OceansFive is offline   Reply With Quote
Old 06-09-2011, 07:19   #7
Registered User
 
OceansFive's Avatar

Join Date: Mar 2008
Location: Langkawi, Malaysia
Boat: Chevrier 36
Posts: 77
Images: 1
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.
__________________
Marine Diesel Basics - first VISUAL guides to marine diesel systems. marinedieselbasics.com
OceansFive is offline   Reply With Quote
Old 06-09-2011, 08:03   #8
Registered User
 
James S's Avatar

Cruisers Forum Supporter

Join Date: May 2008
Location: We're technically refugees from our home in Yemen now living in Lebenon
Boat: 1978 CT48
Posts: 5,964
Images: 139
Re: Correct Transmission Sizing - What Is 'this?' [Pic]

I believe Velvet Drive is manufactured in the U.S.
__________________
James
S/V Arctic Lady
I love my boat, I can't afford not to!
James S is offline   Reply With Quote
Old 06-09-2011, 08:17   #9
Registered User
 
S/V Antares's Avatar

Join Date: Sep 2007
Location: Annapolis, Bahamas
Boat: 1983 Gulfstar 36
Posts: 1,253
Images: 1
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?
__________________
Will & Muffin
Lucy the dog

"Yes, well.. perhaps some more wine" (Julia Child)
S/V Antares is offline   Reply With Quote
Old 06-09-2011, 08:23   #10
Registered User
 
OceansFive's Avatar

Join Date: Mar 2008
Location: Langkawi, Malaysia
Boat: Chevrier 36
Posts: 77
Images: 1
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
__________________
Marine Diesel Basics - first VISUAL guides to marine diesel systems. marinedieselbasics.com
OceansFive is offline   Reply With Quote
Reply

Tags
transmission

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes Rate This Thread
Rate This Thread:

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Advertise Here


All times are GMT -7. The time now is 01:09.


Google+
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.
Social Knowledge Networks
Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2024, vBulletin Solutions, Inc.

ShowCase vBulletin Plugins by Drive Thru Online, Inc.