A thought on Josh's 3HM35F engine issues.... My "new to me" boat had been on the hard for years (4+, at least), and required a emptying and cleaning of the fuel tank, new filters, and a rebuild of the injection pump just to get my YANMAR 4JH-TE started. It seemed to run fine, and we ran it for many hours at various speeds dockside, then changed the oil and filter again. Still more smoke than I would like in the exhaust. In any case, pressed for time, I set out for return to Virginia from Gulf Coast, Florida. In the first 8 hours of running time, used more than 1/2 quart of oil, then something changed. Less smoke in the exhaust, much more power, smoother idle. >From that point on used no more oil on the whole trip up to Virginia. At least 65 more hours of running time. I suspect my engine had stuck rings, and that the combination of running it and fresh oil "unstuck" them. Perhaps this applies to Josh's engine, as well, although I'm not sure how he can run it if it won't start. According to my diesel mechanic, the engine should start and run with the compression he has, just won't produce much power, and may smoke. I'm thinking his starting problem is elsewhere and would suspect the injection pump. Bill MYSTY Landfall 39 Virginia In a message dated 4/11/2014 5:19:11 A.M. Eastern Daylight Time, muckl...@gmail.com writes:
Hey folks, It appears that I have low compression (130psi and 160psi) on 2 cylinders. During the first start of the season the engine started rough and powered the boat just long enough to get to the travel lift and then stalled when I throttled down. I did not attempt to restart because I was in the lift well. Upon relaunch, 5 days later, the engine just won't catch. It kinda acts like it wants to, which I assume is the single cylinder that has enough compression to fire. An additional symptom was unusually high crankcase pressure as indicated by the dipstick that ejected from the engine. A zip-tie was enough to secure it for the trip to haul-out. I have ensured fuel and spray pattern. Changed and cleaned injectors. Tried starting fluid. Attempted to use hot air at the air intake. Cleaned/removed air cleaner. Checked valve lash/operation. Checked exhause elbow. Checked compression. Stuck rings seem to be the most common diagnosis. Any thoughts or suggestions would be appreciated. I think the bigger decision for me and the question for y'all is, what should I do from here. Rebuild? Replace? If I replace should I modernize or stick with a remanufactured 3HM35? If I modernize, should I stick with 30hp or go for something bigger. I fear that anything other than a 3HM35F will cause delays due to configuration and fit. Is it worth it or is that fear unfounded? If I rebuild should I do it myself? I fear a long turnaround and more delays. As you can probably tell I am leaning towards replacing with a remanufactured 3HM35F but I also don't want to miss other opportunities. Thanks, Josh Muckley S/V Sea Hawk 1989 C&C 37+ Yanmar 3HM35F Solomons, MD _______________________________________________ This List is provided by the C&C Photo Album http://www.cncphotoalbum.com CnC-List@cnc-list.com
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