Home |
Search |
Today's Posts |
#1
posted to rec.boats.cruising
|
|||
|
|||
Sailboat 10hp diesel: What symptoms would I experience if the transmission clutches would slip?
Hi!
I've got an interesting problem. The 10.5hp diesel engine in my 28footer sailboat only pushes at about 3.5knots cruising speed at around 3600rpm, which is the max. RPM that is recommended for the engine. I ruled out the following problems: - The engine HPs are theoretically sufficient for that boat (drag/ displacement vs. hp). According to calculations I should get up to 7knots (I'd be happy with 6). - The engine compression is as good as it should be. - The hull is as smooth as it gets. - The 3 blade propeller is in like new condition and exactely the one that is spec'ed for the boat. I had that verified and measured by the propeller manufacturer and several other people. - The engine revs easily above 4200rpm (tried that very briefly). It revs that high either in forward gear, in reverse gear or in neutral. - The RPM gauge shows the correct RPMs. When doing 3600 RPMs, the engine definetly feels like doing 3600 RPMs. - I recently had the shaft coupling, the shaft itself, the shaft seal and the cutlass bearing replaced. They are brand new. The problem was the same before and after the replacement. To summarize: the engine has plenty of power (high rpm in gear), the prop is ok, the hull is ok, the shaft is ok. Therefore, the only problems which I could imagine a 1. The transmission clutches slip either due to overuse/age or due to misadjusted shifting lever. 2. Because this is a custom built boat, the transmission is not the right one and it has the wrong gear ratio. I can't really easily figure out 2. So I first tackle 1. The engine has been running like that at least for 50h now and I would imagine the problem to get worse, if the clutches were slipping. But it stays the same so far. Also, I do not notice unsteady engine revs. It's reving nice and stable and there's no jumping, which I would imagine would happen if the clutches would not "bite" properly. Did anyone ever have a problem with slipping clutches in a sailboat transmission? And what were the symptoms? Did the engine have very unsteady rpms and "jumped"? Any advice is appreciated. Cheers, Dennis |
Thread Tools | Search this Thread |
Display Modes | |
|
|
Similar Threads | ||||
Thread | Forum | |||
Marine algae derived enzymes as diesel catalysts.......... | General | |||
Repost - this is so good it deserves to be read more than once | ASA | |||
Diesel outboard? | Cruising | |||
A tough question for Jeff and Shen44 | ASA |