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post #11 of 12 Old 10-15-2009
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Have you checked the exhaust elbow yet. It will rust and clog up after awhile and is to be changed every few years so I am told. I had similar problems as you. I found an oil leak on the external oil line, antifreeze from the water pump and had a barnacle encrusted prop. It was an adjustable prop and when I serviced it I did not set it right and it ran worse than ever. I reset it properly and it runs fine. My exhaust elbow was so blocked I dont know how water got through. At higher RPMs I also had a foul oil smell that is now gone. From what I read that alot of yanmar 2gm and 3gm30 are over propped and never get to cruising rpm before they start smoking.

That derelict boat was another dream for somebody else, don't let it be your nightmare and a waste of your life.
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post #12 of 12 Old 10-16-2009 Thread Starter
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The exhaust elbow is a great idea and a good first step. I have about 3300 hrs on these engines but only about 1200 under my ownership. I'll bet they are original. This diagnosis makes more logical sense in that at the end of last season everything was fine but right from the start of this season I had this problem. I have 15x9 two blade folding props and run around 2800 rpm. I know some folks with the same boat(PDQ 36) run 16x9 or 11 and claim to have no problems. I have a set of 16x11 blades the PO had put on but claimed that she couldn't get the rpms. Personally I think the yard didn't fit the zincs correctly as my two hubs are different and require grinding about 1/8" of the face of the zinc. On my first haulout I had to have the spline replaced because the prop nut had not been tightened, likely because it bound on the zinc when new.
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