I have a 3HM35F with a KBW10 transmission. The transmission failed in the Bahamas last spring, it was repaired in Nassau, it failed again in the Bahamas, and I limped back to North Carolina. The transmission needed rebuilding again. One of the shops I contacted was Schooner Bay where I talked a couple of times to Alfred Holzer. I got bad vibes. He was what I would describe as "vague" and would not answer the direct question, "Do you have a forward gear for this transmission in your shop?" And, I did not like the look of the operation on Google Maps. Your comments are a confirmation of my impressions.

I ended up sending the transmission to East Coast Marine Transmission in New Jersey where Rick Neary inspected, repaired, and promptly returned the transmission. This winter and spring I traveled from North Carolina to Miami and back mostly motoring in the ICW with no transmission problems. I am a happy customer. You might give Rick Neary a phone call and see what he says. The problem is that the 3HM35F rests on two front engine mounts and two aft mounts that are secured to the transmission. You may not be able to find a replacement transmission with the ability to secure the mounts to the transmission. I'm not sure about the similar Hurth HBW10, but Rick would know. You might also be able to re-locate the aft mounts to the engine. I understand that that is where they are for the 3HM35F engines used in generators.

Bill

irish-eyes-to-the-bahamas.blogspot.com

 

I have a 3HM35F with a KBW10 transmission. The transmission failed in the Bahamas last spring, it was repaired in Nassau, it failed again in the Bahamas, and I limped back to North Carolina. The transmission needed rebuilding again. One of the shops I contacted was Schooner Bay where I talked a couple of times to Alfred Holzer. I got bad vibes. He was what I would describe as "vague" and would not answer the direct question, "Do you have a forward gear for this transmission in your shop?" And, I did not like the look of the operation on Google Maps. Your comments are a confirmation of my impressions.

I ended up sending the transmission to East Coast Marine Transmission in New Jersey where Rick Neary inspected, repaired, and promptly returned the transmission. This winter and spring I traveled from North Carolina to Miami and back mostly motoring in the ICW with no transmission problems. I am a happy customer. You might give Rick Neary a phone call and see what he says. The problem is that the 3HM35F rests on two front engine mounts and two aft mounts that are secured to the transmission. You may not be able to find a replacement transmission with the ability to secure the mounts to the transmission. I'm not sure about the similar Hurth HBW10, but Rick would know. You might also be able to re-locate the aft mounts to the engine. I understand that that is where they are for the 3HM35F engines used in generators.

Bill

Glad I'm not the only one that got that impression of him!

Appreciate the info. I'll reach out to East Coast and see if they have any options.

 

Unless you know the reduction on the tranny, you really can't switch to another. A mentioned above, you'll need to rearrange the engine beds for a different tranny as well, and possibly purchase an adapter plate. Did I understand you were planning on an an electric motor? If so you do not need a trans, so worry about that not at all.

 

I have a running SolidNav unit in the garage. I can yank the Yanmar and have it running on the SolidNav in about an hour.

If I do that, I miss out on the following: No hot water, no way to charge the house batteries (without investing in solar, etc), and limited range vs 30+ hours of running on a tank of diesel.

I think what I might wind up doing is yanking and storing the diesel and running electric until I can find a good transmission at a reasonable price.

 

For boats that theoretically sail, we seem to go through a lot of transmissions. I've been there too. I have a theory as to why. Because the motor is secondary, I think OEMs often undersize them. In my case, the gear is at it's maximum limits for our engine horsepower in recreational use. It would be well undersized for commercial use. That tells me it will wear sooner and can't take much abuse. Despite our best efforts, we'll eventually find ourselves motoring face into the waves or perhaps need to crash stop. These are extremely stressful on the gear.

If I was engineering a replacement, I'd be sure it was at least one size bigger than minimally necessary.

 

I have a used kbw10. 2.14 trans if you still need one

 

I do!!! Still have it? Txt me

I have a used kbw10. 2.14 trans if you still need one

I’ll take it please. If ya still have it.

 

So here's an update to this thread as I know there are a lot of people who have this transmission (KBW10-E) and will come across this issue (replacement or repair). I to have a Yanmar 3HM35F with a Kanzaki transmission. Yes you can replace the transmission with a Hurth but you need to add engine mounts to the Yanmar to support the engine. I just got my transmission rebuilt by Rick at East Coast Marine Transmission and he is not only an awesome guy to deal with he takes care of the customer by throwing in any good parts that needs replacement and he has on hand. As well he sells new OEM parts to you at his cost. He stands behind his rebuilds with a 2 year non commercial warranty. Total time from pulling the transmission out to getting it rebuilt and sent back to me in Hawaii was 1 week. BTW parts are now being produced for this transmission again. The fwd gear (most likely will need replacement) is the most expensive part. $1450 (Ricks cost). Yanmar OEM rebuild kit $1425. Labor 7 hours @$125/hour = $875. Grand total comes to $3750 plus shipping. So you might be able to find a used one on eBay for cheaper (avg $2800 used) but remember your buying someone's else's used transmission and most likely it'll need a rebuild sometime in the near future. As you don't know if someone has wrapped a sheet line or mooring line in that transmission's previous history. Also remember their are different versions of this KBW10 transmission. The B version if slightly different from the E version. Hope this helps

 

I also have a KBW10 with 2.83 reduction, which I'm planning to sell. I have it's history.

 

I would be very interested in that if you would contact me at xxxxxxxxxxx I would appreciate it Thank you