Join Date: Feb 2010
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Re: Transmission Yanmar KM35P problem
I had that negative experience - "lapping" initially "fixed" the problem, but only for about one season... Then it came back. Even worse, the marine lapped it a second time, which lasted even less. Combined wth their time charges (which included every time the mechanic had to walk from the shop across the yard to the boat), it was rediculous.
In the end, I removed the transmission myself with my wife's help, took it to a real Yanmar shop who replaced the cone, and reinstalled it myself, with the total number of hours coming to less than what the yard charged for their lapping band-aid. And it stayed fixed. So much of the work is getting to the tranny, disassembly and reassembly (including a couple of one-time-use seals) that replacing isn't that much more expensive.
Hope this helps.
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1998 Jeanneau SO45.2