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Old 17-01-2018, 20:19   #1
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2QM15. Before I go electric...

Anyone have a lead on finding another Yanmar 2QM15 and tranny? Mostly I need the tranny, a KBW10. Myanmar tells me there are no replacements or much availability of parts. After four flushes with fresh arc it still slips at 1300 rpm even without the remote cable disconnected and shifted at the case. Good time to go electric?
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Old 17-01-2018, 22:04   #2
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Re: 2QM15. Before I go electric...

If you search on KANZAKI KBW10 you should find a rebuilt transmission for $750.

The poor sailor solution would be to swap the reverse friction disks for the forward friction disks. This as the reverse plates are the same size and not nearly used.

But...

Part of the issue is ATF in the stores now a days is it is not at all what it was way back when the KANZAKI KBW10 was built. The KANZAKI KBW10 transmission clutch disks look surprisingly like old honda motorcycle clutch disk assemblies. I would even bet money that one could research it and find a cross reference to a honda clutch disk set that might be a direct fit. They did not design the KANZAKI KBW10 from the ground up but would have sourced parts from existing manufactures.

If it was my boat, I would try straight 30 weight oil rotella T30 first, which will be similar in viscosity to the old DEX I/II. Least before doing anything else. Might fix it. might not, but you'll only be out of a few dollars to try.

I had a old 71 honda 450 and the transmission hated the newer oils and would slip like a sun of a gun. Went to straight 30W and no slipping.
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Old 22-01-2018, 16:26   #3
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Re: 2QM15. Before I go electric...

I was surprised this thread did not get more replies so I will add my thoughts belatedly.

Assuming your engine still has a good life expectancy, then I would investigate repairing the transmission in more detail.

While I'm not familiar with the KBW10, I am familiar with similar Kanzaki transmissions as fitted to the Y & S series engines; I understand the QM series transmissions are almost the same.

They are constant mesh with a single plate mechanical clutch, therefore any slippage can only occur when the clutch plate friction material is worn.

As sailorchic suggested, a poor man's fix would simply to reverse the clutch plate.

Even if a replacement clutch plate is not available, there is a good chance that the old one can be rebuilt but you would have to find someone who specialises with friction materials.

There is not much more in the transmission that will wear. The gears are straight cut and the ball bearings are simple. In the unlikely event the bearing need replacing, they will be available at most bearing specialist shops.
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Old 22-01-2018, 17:53   #4
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Re: 2QM15. Before I go electric...

I went through this same exercise in late 2016. I took two approaches. First, I did my homework and talked to various mechanics who were familiar with the transmission. 3K$ to overhaul.

I talked to Yanmar. I ordered the ahead element friction disks and steel plates and new bearings. Got a friend who is a tractor/farm machinery mechanic to look over my shoulder while I worked and replaced only the ahead element pats. 600$. I also bought an engine/transmission from a sailor who had a failed engine...the transmission was fine at the time of failure. I think I gave him 400$. That purchase also included a pile of spares...starter, alternator, injectors, fuel injection pump, water pumps, zincs, filters, etc.

The 2QM15 is too good of an engine to toss due to KBW10 forward element failure.

I’d query the local marine repair shops and those along the left coast to try to find a 2QM15 out of a boat that recently repowered. Absent finding one, I’d spring for the parts and rebuild. Do you have the service manual? If not, it’s available free on line. Do a search. If you need parts numbers and quantities that I used, PM me and I’ll provide.

Good luck.
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Old 22-01-2018, 18:06   #5
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Re: 2QM15. Before I go electric...

Quote:
Originally Posted by fryewe View Post
The 2QM15 is too good of an engine to toss due to KBW10 forward element failure.
I agree, I would rather have a old QM series then a GM or newer series yanmar. Old school, low RPM design engine that should last a LONNNNGGGGG time.
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Old 22-01-2018, 23:00   #6
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Re: 2QM15. Before I go electric...

Thank all of you that responded. I hear all of you and will proceed accordingly. I'll start pulling the engine and tranny this weekend. I 've put a lot into this engine already and wasn't liking the idea of giving up on her. You're right Sailorchic, they are very hearty.
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