I own a 1983 30ft express sailboat with a yanmar 2gm diesel which is running fine however on a recent trip return after extended motoring (10 miles) starting noticing a slight oil smell and later a strong pop/smell when we raised rpm's to get out of thick weeds. Have since found that the boat will only barely get 2.0 knots @ 2000 rpms I had one mechanic look at boat at dock and after changing gear oil (it was low and discolored) it moves water well at dockage but out in lake erie can barely make headway in current and just seems to lack responsiveness. Any ideas as to problem and possible recommendation of a yanmar mechanic who services downriver detroit,mi would be appreciated. Thanks, Jim
Make (of engine): yanmar
Model (of engine): 2gm
changing oil in gearbox
Hi my name isXXXXX will assist you.
Is the bottom and running gear of the boat clean? Does the engine turn up to full rpms?Here is a dealer locator. http://www.yanmarmarine.com/ Post back with questions.
Tan, boat is clean and i've gone into the drink to make sure prop is weedless. I have no problem taking engine upto 3000 rpm. I was looking for a local mechanic (48173) closest dealer is up on lake st clair about an hour north of us.
Did you check that the prop is firmly attached to the prop? Can you spin the prop on the shaft. Does the engine seem like is is slipping when you apply throttle? This could be worn cone clutch parts or clutch pack depending on which transmission you have. The dirty oil is a clue that the gear is failing. How many hours do you have on the engine and gear? The best bet foe a good Yanmar mechanic in your area is to ask around. I live in south Florida and won't be any help in that area.
The prop is firmly attached and engine is running fine but when you raise rpm's it doesnt feel or act like the increase in power is being transferred fully to the driveshaft and although the boat remains in gear the efficiency of power transfer is hampered. Could this due to worn cone clutch and/or parts the boat built in 1983 is well seasoned but in great shape (2nd owner) ? In first e-mail I mentioned strong pop/burn could this have been seal or gear part that is causing loss of efficiency?
From your description this is a transmission issue which will require removal of the transmission for servicing. One more thing make sure the transmission is going in to full forward. If the control or cable are no allowing full engagement the transmission will slip. Disconnect the shift cable from the shift lever on the transmission and shift manually see how it does. I believe at this point you have worn transmission components causing you issue. The pop/burn could very well be related as the issue came about at the same time.
thanks time to pull the girl out of drink and have gear box serviced
Your welcome.........Thank you in advance.........Tan
35 yrs. experience. I/O, Outboard & Inboard, Complete engine repairs.Certified Technician