Kanzaki trans for 3qm30 Yanmar 1978

[gamayun]

Y'all are making me rue the day I ever have to remove the transmission on my Yanmar

[skipperpete]

They’re actually a pretty reliable gearbox but they just have a few individual quirks (like the damned flange nut) that need more attention than other Hurth based gearboxes.

[SV Cygnus]

Wow thanks everyone, lots of good discussion. Helps me out.
I agree was surprised he was told his nut needed to be replaced. Don’t think he questioned it too much until he couldn’t find one. That’s a nice grind job to make the tool Pete. He’s got a sailboat but not deep pockets, kinda like the rest of us. Looks like I have to figure a locking tool too so as not to be hitting against the gears.

At least I know what’s supposed to happen here now and can look to see if I can come up with a way to get it on there. I’ll show him the link for a new bolt he wasn’t able to find that.
Thanks again everyone you guys rock!

[s/v Jedi]

You need to stake it.

[SV Cygnus]

Originally Posted by gamayun

Y'all are making me rue the day I ever have to remove the transmission on my Yanmar

Haha but it’s not so bad, just the rear seal. It your doing the whole trans the shop will take care of the nut. I let you all know how this turns out.

[SV Cygnus]

Originally Posted by s/v Jedi

You need to stake it.

Yes when I crawl back in the I’ll bring some hardware. Like a silver stake!

[Wotname]

Originally Posted by jimbunyard

P/n from Yanmar is 177099-09010, .........

Originally Posted by jimbunyard

Well, listed torque for a 20 mm, 10.9 rated bolt is 480 ft lbs.

Nonetheless, certainly seems excessive to me, especially for a splined-flange retaining nut.

Originally Posted by skipperpete

I’ve always thought the manual was a missprint ......................

FWIW, the 2QM20 Kanzaki transmission (KBW-10) uses the same special tool does the 3QM30 KH-18 transmission and the torque figure as per the manual is 9.5 kg m (68.7 ft lbs) so something seems to be incorrect somewhere

[Wotname]

More manual discrepancies.

The output shaft coupling removal tool has a different part number (177090-09100) but sure looks the same as the installation tool; after all, it is the same nut.

I wonder which one is the right one.

[jimbunyard]

Originally Posted by Wotname

FWIW, the 2QM20 Kanzaki transmission (KBW-10) uses the same special tool does the 3QM30 KH-18 transmission and the torque figure as per the manual is 9.5 kg m (68.7 ft lbs) so something seems to be incorrect somewhere

Well, there we have it. It's either a term error; should be newton meters, not kg m, 100 nm = 74 ft lb. Or an added-number error, 10 kg m = 72.3 ft lb.


According to this page, 177099-09010 is the correct p/n for the slugging wrench.

[Wotname]

^^ Yep JimB, I think you are on the money

That torque plus staking should do it!

[s/v Jedi]

Originally Posted by SV Cygnus

Yes when I crawl back in the I’ll bring some hardware. Like a silver stake!

I think you do not know what I mean because your response sounds strange... but then again it’s probably me nit understanding jokes that everyone else gets. Just to make sure a video:

https://www.youtube.com/watch?v=gyR16Ev_rcA

[SV Cygnus]

Originally Posted by s/v Jedi

I think you do not know what I mean because your response sounds strange... but then again it’s probably me nit understanding jokes that everyone else gets. Just to make sure a video:

Thanks for that explanation. I used a chisel. I see this looks like the correct way

[SV Cygnus]

We have not been able to locate a new nut for this transmission. I’m told the mechanic said the nut was bad, couldn’t be tightened enough. I’m thinking it jumped a thread when he tried to torque it. Owner says he’s had nut off since an noticed no problem with the treads themselves.

Anyone know where to get a new one? Or has anyone found a link?

[Wotname]

Originally Posted by SV Cygnus

We have not been able to locate a new nut for this transmission. I’m told the mechanic said the nut was bad, couldn’t be tightened enough. I’m thinking it jumped a thread when he tried to torque it. Owner says he’s had nut off since an noticed no problem with the treads themselves.

Anyone know where to get a new one? Or has anyone found a link?

Can't help directly but there has to be a lot of these transmissions not in use and being wrecked. Try asking on craigslist or whatever you have in your part of the world.

You can make a nut yourself - it is a standard metric thread. Cut / machine an off-the-shelf high grade nut to the right dimensions using the old nut as a guide. Without seeing it up close, I think a normal hex head will suffice.

[jimbunyard]

You should measure both nut and the shaft to determine if one or the other is indeed out of spec; the one in the picture certainly doesn't look bad, but pictures can be deceiving.

If the shaft thread is good and there's room I was going to suggest exactly what Wot suggests, just for general purposes -- and to get rid of the bastard-sized nut.