Trojan transmission question

captain don · Post by **captain don** » Wed Jul 15, 2009 7:07 am

I am restoring a 1977 F-32 and need answers to some pretty basic questions for now. I am missing the port velvet drive transmission. If I start searching for one is it the same as the starboard? I know the port engine is counter clockwise but is the transmission also different. Also to match up, is the gear reduction located on the outside and what do I look for? Thanks, Captain Don

rossjo · Post by **rossjo** » Wed Jul 15, 2009 8:43 am

1st - determine what model you have ... Inline (P/N 10-xx-xx) or Down Angle (P/N 20-xx-xx) - (Your's is undoubtedly down-angle.
http://boatdiesel.com/Transmissions/Vel ... -Drive.cfm

2nd - What gear ratio:

1:10:1 (direct)
1.52:1
1.88:1
2.10:1
2.57:1
2.91:1

3rd - Reverse the direction with hydraulic pump (they must NEVER simply be run in reverse to get counter -rotation). Here's how to setup counter-rotation properly:
http://www.boatgears.net/Velvet_Drive_Tips.html

rossjo · Post by **rossjo** » Wed Jul 15, 2009 8:46 am

http://www.velvetdrive.com/productsm.html
http://www.velvetdrive.com/7172.html
http://www.velvetdrive.com/techinfo/V7172/V7172pg1.pdf
http://www.velvetdrive.com/techinfo/V7172/V7172pg2.pdf

rossjo · Post by **rossjo** » Wed Jul 15, 2009 8:47 am

http://www.marine-engine-parts.com/Tran ... elvet.html

rossjo · Post by **rossjo** » Wed Jul 15, 2009 8:49 am

For ref (I have diesels however), I have 1:1 down-angle 20-01-001 models

Beacon has them on this site for about $2.5k
http://www.trojanboats.net/TB%20Transmissions.htm

rossjo · Post by **rossjo** » Wed Jul 15, 2009 8:53 am

That was the MOST painful post in history. Apache PHP forbidden access errors kept locking me out, so I had to split the post up into 4 sections and re=type most of it ... sorry guys ...

rossjo · Post by **rossjo** » Wed Jul 15, 2009 9:12 am

1 addition. These guys have great info on their site:

Here are the Velvet Drive Rotations:
http://www.boatgears.net/Rotation_Guide.html

http://www.boatgears.net/Velvet_Drive_models.html

5000 (Model 2001 - 2002) Series & Liberty (Model 3001) Series

prowlersfish · Post by **prowlersfish** » Wed Jul 15, 2009 12:56 pm

I would think they would be inline not down angle with gas engines anyway the trans should be the same both sides in most case you would just have the pumps turned diffrently