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-   -   Velvet Drive 71c rebuild (http://www.mastercraft.com/teamtalk/showthread.php?t=53874)

Wouter 04-25-2013 10:33 AM

4 Attachment(s)
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

Wouter 04-25-2013 10:46 AM

1 Attachment(s)
Bellow is a diagram of the velvet drive: I'll use the diagram part numbers for the rest of the thread:

Wouter 04-25-2013 10:47 AM

1 Attachment(s)
remove transmission from boat and note position of pump housing.

Wouter 04-25-2013 10:50 AM

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remove pump housing 104

Wouter 04-25-2013 10:55 AM

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remove pump drive gear 101 (slides off)
remove woordruff key 65 from drive gear assembly 64

Wouter 04-25-2013 11:00 AM

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remove 99 (12 points (10mm) 3/8" socket necessary)

Wouter 04-25-2013 11:02 AM

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forward and reverse adapter (99) comes off
Note sealing ring 96 is sitting on adapter 99

Wouter 04-25-2013 11:08 AM

3 Attachment(s)
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

Wouter 04-25-2013 11:13 AM

1 Attachment(s)
You can pull the drive gear assembly at this point (just pull out by hand)

Wouter 04-25-2013 11:18 AM

2 Attachment(s)
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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