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  #1  
Old 04-25-2013, 11:33 AM
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Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
As mentioned in my other thread :
http://www.mastercraft.com/teamtalk/...ad.php?t=53645

After changing the ATF fuid of my velvet drive 71c (model 10-17-004) (which had probably never been changed) the transmission started slipping severely. I decided, it was time for a rebuild, so here goes the write-up:

Tools/fluids/parts you’ll need:
- Dexron III ATF oil (preferably mineral)
- WD40 / engine cleaner
- Rebuild kit (includes forward and reverse clutch plates, seals and gaskets) http://bpi.ebasicpower.com/p/ALT23901
- Complete snap ring set or at least front bearing snap ring:
http://bpi.ebasicpower.com/p/ALT23255
- Possibly a new damper plate:
http://bpi.ebasicpower.com/p/ALTDA-106A/
(All these parts are also available elsewhere (i.e. skidim.) I have no affiliation with ebasic.
- An arbor press (mainly to compress the clutch pack)
- Snap ring pliers
- Rubber mallet (came in very handy)
- The usual assortment of torque wrench(es), socket (hex but also at least one 3/8" 12 points socket), etc.
- One big (38mm) 1-1/2” hex socket
- A feeler gauge 0.018" to 0.055" (to set clutch clearance)
- Shop or service manuals:
http://www.mastercraft.com/teamtalk/...ad.php?t=32581
different manual attached to this post. look below transmission tag.

Important things to remember:
This thread does not cover reduction ratios.
Stage the parts in order as you are pulling them out to remember how they go back in.
If you can, take pictures as you go in case you forget how/when a particular part came out.
Make sure to note position of pump housing (this is particular to your engine’s rotation direction.)
Read service manual and thread completely before starting
Attached Images
 
Attached Images
File Type: pdf BW71C_72C_reduced2.pdf (1.64 MB, 618 views)
File Type: pdf Borg-Warner-Velvet-Drive-71C-72C-Transmission-Owners-Manual_red.pdf (1.49 MB, 948 views)
File Type: pdf 16A8R2.pdf (187.8 KB, 535 views)

Last edited by Wouter; 04-29-2013 at 05:43 AM.
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  #2  
Old 04-25-2013, 11:46 AM
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Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
Bellow is a diagram of the velvet drive: I'll use the diagram part numbers for the rest of the thread:
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  #3  
Old 04-25-2013, 11:47 AM
Wouter's Avatar
Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
remove transmission from boat and note position of pump housing.
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Old 04-25-2013, 11:50 AM
Wouter's Avatar
Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
remove pump housing 104
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  #5  
Old 04-25-2013, 11:55 AM
Wouter's Avatar
Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
remove pump drive gear 101 (slides off)
remove woordruff key 65 from drive gear assembly 64
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  #6  
Old 04-25-2013, 12:00 PM
Wouter's Avatar
Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
remove 99 (12 points (10mm) 3/8" socket necessary)
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  #7  
Old 04-25-2013, 12:02 PM
Wouter's Avatar
Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
forward and reverse adapter (99) comes off
Note sealing ring 96 is sitting on adapter 99
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Last edited by Wouter; 04-26-2013 at 10:10 AM.
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  #8  
Old 04-25-2013, 12:08 PM
Wouter's Avatar
Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
remove reverse clutch pressure plate (92) (it's sitting on the adapter in picture), outer clutch plate (91) and reverse clutch assembly (90)
stage in order
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Last edited by Wouter; 04-26-2013 at 09:59 AM.
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  #9  
Old 04-25-2013, 12:13 PM
Wouter's Avatar
Wouter Wouter is offline
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Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
You can pull the drive gear assembly at this point (just pull out by hand)
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  #10  
Old 04-25-2013, 12:18 PM
Wouter's Avatar
Wouter Wouter is offline
TT Enthusiast
 
Join Date: Jan 2007
Boat: Mastercraft Prostar 190, 1990, Indmar Ford 351w GT40P, Borg Warner 1/1 Velvet drive 71c 10-17-004, pp stargazer, Acme 13
Location: Belgium
Posts: 257
Remove snap ring 87 (this one is very thight and often gets warped with removal, that's why you might want to order it with the rest of the parts)
and snap ring 88 (use snap ring pliers)
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Last edited by Wouter; 04-25-2013 at 12:42 PM.
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