Josh, If the remedies already posted do not clear up the hard start and stalling look closely at the head gasket then the head itself (look for indications of a crack).
I had a 1980 C&C 36 with a 3 cylinder Yanmar that become hard to start, spewed whitish smoke for a bit and ran rough occasionally stalling. The cylinder head had developed a crack between two cylinders. I ran the engine on with the cracked head for a summer cruise sometimes using the compression release to get the engine to fire. We re-powered the 36 that winter. Other telltale signs of a failed head gasket or crack: oil/carbon in coolant, excess fuel being blown out exhaust, especially at start, whitish exhaust smoke (unburned fuel), a pressurized crank case, especially with lube oil level increasing. Martin Calypso 1971 C&C 43 Seattle [cid:D1BF9853-22F7-47FB-86F2-4115CE0BAF2F] From: CnC-List [mailto:[email protected]] On Behalf Of Josh Muckley Sent: Friday, April 11, 2014 2:18 AM To: C&C List Subject: Stus-List Yanmar 3HM35F low compression 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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