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Sounds just like what I expected in regard to the shaft seal. They get hard and crack, especially if the shaft alignment is not perfect. Also raising the front of the 3 inches might only move the angle of the coupler a degree or two. Reasonable. My only other worry for you might be in the...

Can anyone tell me where to find the pdf SteveK sent?

I just bought a 1979 Hershine 37 from Kingston, WA

I have overhauled 3 of them so far. It definitely is an easy task. The trick is identifying which model it is before opening it up so I can get the right kit when the tag is gone.

I don't know how to find the pdf and download

If the valve allows a bypass to take place because of a changed tension value (damaged or broken spring) that would explain the clutches surviving without burning up.

I know that there is a spring controlled poppet in the control valve. Would this function as a pressure relief valve? I know the outfeed from that poppet goes directly to the cooling lines (no pressure). As a bypass valve I suppose it would function as a pressure control by default.

The problem is that if a rebuild is necessary, you need a model type to get the right kit. Is there a pressure relief valve on a Velvet drive? I was not aware of one. That could explain a lot if there is one.

Yes. I'm an experienced diver. I just didn't have my drysuit with me. Last dive I got a hole in my neck seal. A new seal should arrive this week. That thought about the heat generated really has me baffled. In every case in the past I have seen massive heat generated by slipping clutches...

Yes it would. I bought one about a month ago for other reasons but will take it with me for next trip. Will have to have someone else drive boat while I compare rpms at start of the propshaft and same if speed slows down again. Found a hatch at the back of the engine room where I can get easy...

Is there any way to determine the model of Velvet Drive without the numbers? The plate is missing completely. Original engine was 1979 Lehman 120hp diesel. Velvet drive in there now is original. My guess is a 71-C. I can't imagine they would put a 72C in it when there was no need for the...

Is there any way to determine the model of Velvet Drive without the numbers? The plate is missing completely. Original engine was 1979 Lehman 120hp diesel. Velvet drive in there now is original. My guess is a 71-C. I can't imagine they would put a 72C in it when there was no need for the...

Well it was definitely worth a look. The trans fluid was sweet smelling and absolutely clean. Probably Dexron II or III. No water in fluid. Looks freshly changed. No oil in bilge. Did find the heat exchanger hoses aimed parallel to water surface so a false oil level would be a factor. Oil...

thats where I'm headed now... hopefully I'll find answers

will be going to check out thoroughly this weekend.

appreciate the response. Going to check it out this weekend. Was in too much of a hurry on the day of the trip to investigate. Was relieved to have made it in without towing it. My ride was in the car waiting for an hour and a half. Will post findings once I get to check it out. Have...

These are all good questions. If I had a chance to stop the boat to look in the engine room I would have but I didn't realize I had a problem with the vessel itself until I got in a dangerous area. This was the very first run I ever made with the boat and didn't know its personality and...

Also ANY TIME the shaft gets separated from the transmission and the trans gets moved you need an alignment to make sure the same problem isn't going to occur again.

I have changed numerous engines and transmissions both diesel and gas. I never do anything to support the propshaft if it still has support by the stuffing box within a couple feet of the coupler. The weight of the shaft is counterbalanced and held by the cutlass bearing in the rear and the...

I just bought a 1979 Hershine 37' Trawler. 120 Lehman diesel / Borg Warner Velvet Drive. Left Eagle Harbor on Bainbridge Island, WA for 2.5 hour run. Tide with me all the way. Started out @ 8 kts +/-. After an hour or so speed kept dropping. Ended trip at 1.5 kts with same engine speed of...