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
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