Transmission Yanmar KM35P problem - SailNet Community

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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel
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Old 06-05-2014
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Transmission Yanmar KM35P problem

Hi Folks

2009 Beneteau 40
4JH4AE engine .... 1100 hours
Yanmar KM35P transmission (also called Kanzaki TTMC35P)

Works in reverse. When in forward it does not engage or only weakly. Then get revs up to about 1800 and it slams into gear. The cables are fine and the lever on the side of gear box moves easily and to the fullest extent.

Sounds like truly an internal problem. The oil (SAE 30 HD) is a bit black but doesn't smell burnt.
A friend suggests flushing numerous times with say SAE 10 to see if anything is stuck or "plugged". I've no idea what's inside!!
Any ideas?
thanks, John
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Old 06-05-2014
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Re: Transmission Yanmar KM35P problem

If that is a cone clutch tranny, it sounds like the cone is worn. My 2GM20 had that problem (don't recall which transmission it had; your number sounds familiar, though yours is likely bigger but may still be a cone clutch). One shop lapped the cone, but that was a band-aid (for $800!) and not much cheaper than having it replaced properly. A worn cone slips until enough revs/power to get it to engage... until it's too worn for even that. I had to drive the boat thru Canadian Customs in reverse when forward would no longer work.


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Old 06-06-2014
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Re: Transmission Yanmar KM35P problem

Does your book ask for 30 wt or hydraulic trannie oil ? Either way it's not a biggie to put it on the bench for a look see. Then you can decide on fix or replace.
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Re: Transmission Yanmar KM35P problem

The oil is engine oil ... SAE 30 HD (Heavy Duty).

Not very easy to take tranny out .... I guess depends on your experience and skilll level. It obviously needs to be disconnected from prop shaft hoping have enough room to push shaft back before prop hits rudder and taking care to secure the shaft. Unbolting from engine also not easy unless you are very slim/strong with very long arms. It is all pretty packed in and not exactly designed for most folks to take apart. Would help if a few bits of aft berth woodwork were screwed together rather than glued.
Really appreciate the info.

IMPORTANT FOLLOW UP:
Has anyone else had negative experience with "lapping the cone" which I think means getting rid of the glazed/slippery surface that is causing the slippage. As against replacing with a new piece.

John
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Old 06-10-2014
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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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