Originally Posted by Tellie
. . . . New exhaust elbow and gasket to be sure. . . . If you want to play with cleaning
the old one for a spare you'll realize that a new one is just easier. Pull the head yourself and have it cleaned an checked and replace it yourself. You could have the compression
checked but my guess is that you've been loving this engine to death. Let it run like Yanmar specs say to run it.
Good advice, Tellie. Even before pulling off the old elbow, I decided if it was good, keep it otherwise ditch it, get a new one [which I have done]. I wouldn't be relaxed using a patched up old one as it is critical for good operation though I would use a sound condition old one [and carry a spare].
You are the second person to suggest pull the head off and I think it is probably the best thing to do. Being 9 hrs drive away from my boat makes it difficult to pop down there but if I can clean the exhaust port, maybe it will run better so I can more easily bring her down when the wind
is in the right direction. Then I can take the head out more easily.
I just got the boat and in the ten hours or so of engine use, I have been loving it but hopefully not to death. First thing I did was replace the aircleaner since it was feeding foam element into the cylinder, not a nice diet. I changed the chewed up water
pump rotor and anode along with the fuel filter
. The oil
was so black and thick I almost had to scrap it out and along with changing the oil filter
I have changed the oil twice, yes, twice with the second time after ten hours running. I have had diesel motors before but never seen such aweful oil in a sump.
When the motor first started, which in itself was a drama as the PO had not done the storage
thing but the motor sat for 6 months, I could only get 2 knts max out of it. At 2,500 revs the black smoke was so bad I thought if I get a wind
shift and it blows back on me I will die of no air.
Cleaning the prop of growth got me 5 knts easy though at 3,000+ revs with load, the black smoke starts to appear again. An instruction note I found left by one of the PO's for the PO before me said that the motor always blows black smoke, that is just the way it is. The note also said how to shut down the motor using the decompression lever which is a big no-no. So, major neglect from various PO's. I am not a perfectionist but I try to reduce risks by keeping equipment
operational and that to me means proper maintenance
I don't know exactly what made the buildup of carbon, but I do know the motor has been neglected and it will be much much better when it is able to breath in and out more easily and the prop is completely polished rather than just having me dive down into the croc-infested murky water where it is moored to bash barnacles
off to clean it up a bit. I am looking forward to the time when I don't get anxious everytime I go to start it that it won't go and it is purrs along sweetly, if ever these single
cylinders can be said to 'purr'.