Good Evening All,
I have a 1988 P31-2, 3rd owner for the last 12 years with unknown engine hours. The 2GM20F (16HP) was getting hard to start and burning oil at higher RPM so I figured it was time for a rebuild. I don't have the time or energy to do this work any more so pulled it out and sent it to the local Yanmar shop (Yeah, I know, they have us by the short hairs). Initial tear down showed bent connecting rods and the mech said it looked like water had gotten into the cylinders. I took that as a bad sign. They came back with an rebuild estimate of $7600 for the engine and transmission! Labor was a big chunk of that. Alternative 1 was a new 2YM15 (13.6HP) with transmission, instrument panel, wire harness and mixing elbow = $6,523 (plus shipping and tax) which will be pretty much a drop in replacement. Alternative 2 new 13YM20 (20HP) with transmission, instrument panel, wire harness and mixing elbow = $7,359 (plus shipping and tax). The shop will give me a break on the new engine, about $1K, for the old engine and hours spent so far. I would rather not go down in power but going to the 3YM means moving motor mounts and re-machining the new prop shaft that was just setup for the 2GM, I also have to put the prop shaft in before the engine so need to make a decision soon as I burning bucks on storage fees in the yard. Although it's more expensive, I'm considering just rebuilding the 2GM as I would get a stronger engine and nothing else changes in the setup. I've checked the Interweb for rebuilt and didn't find as much as I expected and am leery of buy a freshly painted "reman" engine from 1200 miles away, the price is right but... Changing to a different engine maker would probably open another can of worms.
So, I'm sure other have gone through this and I like to hear what other have done.
Thoughts/comment?
Joe