Borg-Warner 10-17 Velvet drive locking up????

[barefootboy4]

My wife tried to post this question yesterday but left out all the details. My 1988 comp ski boat has a 5.7 liter (350ci)Mercrusier. Model is 5.7SKI. It has a standard Borg-Warner 10-17 Velvet Drive transmission. Do not have the serial #'s.

After doing battle with this issue for the entire summer and going thru parts on the engine I have decided my problem is the transmission. The engine starts and idles fine. If you rev it up in netural it is fine. Here is the odd part. Sometimes when I put in gear it will run fine but quite often when it's hot it will simply stall out. The transmission oil has always looked nice and clear but I checked it and it's black and nasty. I feel it's overheated for some reason. The oil cooler looks good inside but who knows. It acts like there is a huge overload on the engine like a rope wrapped around the prop shaft. Someone suggested that there can be a issue with the velvet drive trying to shift into forward and reverse at the same time. Has anyone heard of this?? This would make sense? How do you check it. Sounds like the selector valve leaking by? Any help out there. Thanks
Steve

 

[Tahorover]

Re: Borg-Warner 10-17 Velvet drive locking up????

Is your cutlass bearing OK?

You can check you clutch pressure to forward and reverse with pressure gauges. There are taps in the case to hook up pressure gauges.
Go to page 36 of the shop manual:
http://www.marineryachts.com/borg_manual.pdf

 

[Don S]

Re: Borg-Warner 10-17 Velvet drive locking up????

Here is a link to the OEM service manual too. Section 8A covers your transmission.
http://www.4shared.com/document/lGC4GhQ0/Service_Manual_15.html

Those are fairly simple transmissions to rebuild, and kits are readily available. It could be the clutches are worn out completely.