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Go Back   SailNet Community > On Board > Gear & Maintenance > Engines > Diesel > Yanmar Transmission Clutch Problem
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Thread: Yanmar Transmission Clutch Problem Reply to Thread
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Topic Review (Newest First)
07-17-2013 04:59 PM
bristol299bob
Re: Yanmar Transmission Clutch Problem

Just saw this post so I am a little late to the party.

I've recently replaced the Kanzaki-Hurth KBW10 transmission on my yanmar 2QM20. I had similar symptoms as the OP. I decided to replace it with a with a good used unit, exact same model but newer. I have the failed original at home on my bench waiting for winter when I plan to tear into it.

I happen to have the factory manual for the KBW5/10/20. The OP mentions that he has the HBW10 and here is an online manual for that transmission: Boatinfo - Hurth 5 10 20 Service Manual

Briefly looking over that manual, it seems that the HBW is very similar to (if not the same as) the KBW. So that manual may be helpful to owners of the KBW as well.

I want to point out that I believe that the service bulletin referenced does not pertain to the KBW or HBW transmission. The service bulletin applies to:
"mechanical type gearboxes and sail drives only ... Marine gear Models KM2P, KM35P, KM35A and KM4A".
I believe these are the cone clutch style transmission that use motor oil in the transmisison. The KBW/HBW transmissions do not have a cone clutch and use ATF.

Which begs the question: where do the KWB/HWB faithful set the shift lever when sailing? I have always understood that for this style of transmission it was best to place it in reverse. A few mechanics have told me so, but I am starting to wonder.

I hate sailing with the trans "locked" in reverse because of the drag. I know I could squeeze another 2 or 3 knts out of her if I put it in neutral :-)
07-16-2013 06:11 PM
SlowButSteady
Re: Yanmar Transmission Clutch Problem

Quote:
Originally Posted by Rusty123 View Post
The referenced Yanmar tech bulletin says to leave the transmission in neutral during sailing, but that the shaft can be locked (with an add-on device) if the user doesn't like the prop rotation noise.

Question: what does prop rotation noise sound like? I get a faint squeal or whine (a little like a bad bearing) from my transmission when under sail in neutral. Is that sort of noise normal?
Often times a free-spinning prop will sound a bit like a low humming noise. There may be a bit of a squeal (if your listening to the transmission more directly, such as via an open lazarette), kind of like a car gearing down. If in doubt, take a look at the shaft to see if it's turning.
07-16-2013 03:51 PM
Rusty123
Re: Yanmar Transmission Clutch Problem

The referenced Yanmar tech bulletin says to leave the transmission in neutral during sailing, but that the shaft can be locked (with an add-on device) if the user doesn't like the prop rotation noise.

Question: what does prop rotation noise sound like? I get a faint squeal or whine (a little like a bad bearing) from my transmission when under sail in neutral. Is that sort of noise normal?
07-13-2013 02:28 PM
ncapener
Re: Yanmar Transmission Clutch Problem

I bought a pdf manual from the dealer. Covers transmission and 1,2 and 3 cylinder engines.
Send me your email and I send you a copy.
gonesailing4good@yahoo.com
Cheers,
Neal
07-12-2013 04:02 PM
Northsman
Re: Yanmar Transmission Clutch Problem

Quote:
Originally Posted by ncapener View Post
Hello,

I have a 3 HM 35 engine with a KBW10 transmission.
Recently the clutch started to slip, now it does not engage at all.
I took the transmission out and the cover off. I am looking inside the housing at two shafts with gears on them, a shift fork and what appears to be clutch plates on the larger shaft.
I would like to repair/ replace the gear box myself. How do I proceed ? Drawings or pictures available anywhere? I think, I can get the parts. I am not a mechanic, but I have a good set of tools and have taken a VW transmission apart once and changed the synchro rings....
Anybody done that job and can help?

If not possible to repair, Is there a way to lock the gear box in forward to get home???

Thanks,
Neal
I'm haveing the same problem as you With the transmission (gearbox) model KBW-10 mounted on an old 1979 model yanmar 20QM20 motor. Where did you get the gearbox manual and how did you solve your problem? In advance tks from Norway.
07-12-2013 04:01 PM
Northsman
Re: Yanmar Transmission Clutch Problem

Quote:
Originally Posted by ncapener View Post
Hello,

I have a 3 HM 35 engine with a KBW10 transmission.
Recently the clutch started to slip, now it does not engage at all.
I took the transmission out and the cover off. I am looking inside the housing at two shafts with gears on them, a shift fork and what appears to be clutch plates on the larger shaft.
I would like to repair/ replace the gear box myself. How do I proceed ? Drawings or pictures available anywhere? I think, I can get the parts. I am not a mechanic, but I have a good set of tools and have taken a VW transmission apart once and changed the synchro rings....
Anybody done that job and can help?

If not possible to repair, Is there a way to lock the gear box in forward to get home???

Thanks,
Neal
I'm haveing the same problem as you With the transmission (gearbox) model KBW-10 mounted on an old 1979 model yanmar 20QM20 motor. Where did you get the gearbox manual and how did you solve your problem? In advance tks from Norway.
12-22-2012 06:51 AM
Rockter
Re: Yanmar Transmission Clutch Problem

If you leave the transmission in reverse such that the gears cannot turn, how on earth does that wear the transmission??????

I cannot imagine anyone wanting the transmission to spin when you are sailing with motor stopped.

It is just needless wear.
12-21-2012 06:30 PM
Brent Swain
Re: Yanmar Transmission Clutch Problem

Mine will turn if left in forward but not if left in reverse. Left it in reverse for several Pacific crossings, no problems.
12-21-2012 12:40 AM
Goldfinger
Re: Yanmar Transmission Clutch Problem

Quote:
Originally Posted by ncapener View Post
I don't think that leaving the tranny in gear while sailing is a bad thing.
Yanmar advise against leaving it in gear.

edit: Sorry, didn't see the other posts until I posted this. Tried to delete but fail! Sorry to waste your time.
12-14-2012 11:37 PM
jsaronson
Re: Yanmar Transmission Clutch Problem

Sure!
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