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Old 11-05-2020, 04:36   #91
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Re: Dropped a straw in my gearbox!!!!

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Originally Posted by a64pilot View Post
I think this transmission isn’t really a Yanmar? I know it says Yanmar on it, but I think it’s a Hurth? I say that as maybe the thread is different than what Yanmar uses in the engine that they build.
Yanmar KBW10, Hurth HBW10.... from the shop manual.

Bill
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Old 11-05-2020, 09:56   #92
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Re: Dropped a straw in my gearbox!!!!

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Sell the boat and let the new owner worry about it.
I will never buy a used boat ever again
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Old 11-05-2020, 15:38   #93
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Re: Dropped a straw in my gearbox!!!!

Ended up tapping the hole out to 1/8 NPT and using a brass plug. Will try and source a bronze plug later.
Everything is back together and performed well with testing at anchor.

Remember folks, never stick anything in a gearbox fill hole thatís shorter than the gearbox. Thanks for everyoneís input.

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Old 11-05-2020, 15:40   #94
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Re: Dropped a straw in my gearbox!!!!

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Sell the boat and let the new owner worry about it.


There is a special place in hell reserved for people that do this.
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Old 11-05-2020, 15:51   #95
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Re: Dropped a straw in my gearbox!!!!

Quote:
Originally Posted by Swift Drift View Post
Ended up tapping the hole out to 1/8 NPT and using a brass plug. Will try and source a bronze plug later.
Everything is back together and performed well with testing at anchor.

Remember folks, never stick anything in a gearbox fill hole thatís shorter than the gearbox. Thanks for everyoneís input.

Attachment 214871
For future reference, you can fit a male NPT into a female BSP (in the these small sizes). It will be ever so slightly loose but works OK when a suitable thread sealant is used. However the reverse is not true i.e. a male BSP does not work in a female NPT.

If the large plug at the bottom of the picture is a anode (it looks like one to me), then the brass plug will be good for a long time; of course, a bronze one will be better!
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Old 11-05-2020, 16:01   #96
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Re: Dropped a straw in my gearbox!!!!

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Originally Posted by Swift Drift View Post
Well, during reassembly I snapped off the petcock drain at the bottom of the oil cooler. I was able to extract the remaining section and chase the threads in the cooler with a tap so they are good and clean.
Now I need to make a decision on what to plug the hole with. Iím tempted to use a stainless bolt with some tef-gel or lock-tite on it. But Iím concerned about the whole dissimilar metal scenario.
Am I making a bad decision by going with a stainless bolt? I think the cooler is bronze? Pretty sure the old corroded petcock was brass.

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Ohhhhhhhhh boy. Here we go again!!!!!!!!
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Old 11-05-2020, 16:13   #97
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Re: Dropped a straw in my gearbox!!!!

Quote:
Originally Posted by kmacdonald View Post
Sell the boat and let the new owner worry about it.
Quote:
Originally Posted by Cool Hand Luke View Post
I will never buy a used boat ever again
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Originally Posted by Swift Drift View Post
There is a special place in hell reserved for people that do this.
For sale. Owned by a surveyor, rebuilt diesel. That means it had an oil change by a grease monkey.
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Old 12-05-2020, 06:14   #98
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Re: Dropped a straw in my gearbox!!!!

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Usually they arenít machine threads, often they are NPT.
If itís machine threads then Iíd use a bolt with tef-gel with the intent of changing it later with something bronze, if itís NPT, then I believe Iíd be tempted to use a PVC plug if you can find one, there is no real pressure there, and brass as a last resort, with the intent of later putting on whatís supposed to be there, surprised if it was brass.
I donít have a cooler, but there are I believe similar drain pet docks on the heat exchanger and a couple of other places on the engine, one is I believe plastic.

Yanmar May also have used a wierd British thread, but I donít believe this is really a Yanmar transmission, maybe not.
My 4-JHE uses this weird British thread on its oil galley plugs, I ran into that when installing an oil pressure gauge.

I think the KBW-20 is a Hurth transmission built under license?
Weird British thread is correct. Japanese and British pipe threads are the same. Since you are down on the Antilles, you may be able to find a Brit pipe-plug or pet-cock to fit. I wouldn't try to jam a mismatched bolt in and make things worse.
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Old 13-05-2020, 06:33   #99
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Re: Dropped a straw in my gearbox!!!!

Does anyone know where I can source a service manual for the KBW 21?
All of this messing about has inspired me to have one on board.
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Old 13-05-2020, 06:55   #100
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Re: Dropped a straw in my gearbox!!!!

https://www.manualslib.com/manual/13...age=159#manual

The 20 and 21 use the same manual. The link above is for the engine, the KBW20 and 21, and, I believe, but didn't look, the saildrive transmission.


By the way, not sure if, in the discussion about plug materials, anyone mentioned it, but it's better to have a less noble metal as a plug material than a more noble one, so that the plug 'sacrifices' rather than some other metal in the transmission. Probably best to have the materials within .15 V on the galvanic index, as described in this article, so neither 'sacrifices'.

https://www.corrosionpedia.com/an-in...rrosion/2/1403
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Old 15-05-2020, 07:26   #101
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Re: Dropped a straw in my gearbox!!!!

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Originally Posted by jimbunyard View Post
https://www.manualslib.com/manual/13...age=159#manual

The 20 and 21 use the same manual. The link above is for the engine, the KBW20 and 21, and, I believe, but didn't look, the saildrive transmission.


By the way, not sure if, in the discussion about plug materials, anyone mentioned it, but it's better to have a less noble metal as a plug material than a more noble one, so that the plug 'sacrifices' rather than some other metal in the transmission. Probably best to have the materials within .15 V on the galvanic index, as described in this article, so neither 'sacrifices'.

https://www.corrosionpedia.com/an-in...rrosion/2/1403


Thank you sir!

Thinking to to the future, does anyone know of a good source for rebuild parts? Clutch packs, etc.
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Old 15-05-2020, 08:00   #102
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Re: Dropped a straw in my gearbox!!!!

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For future reference, you can fit a male NPT into a female BSP (in the these small sizes). It will be ever so slightly loose but works OK when a suitable thread sealant is used. However the reverse is not true i.e. a male BSP does not work in a female NPT.

If the large plug at the bottom of the picture is a anode (it looks like one to me), then the brass plug will be good for a long time; of course, a bronze one will be better!
It will fit, sort of. I believe it will be ever so tight though, I know that you can tap a 1/8” BSP to a 1/8” NPT and if the BSP was larger, you couldn’t.
I gave up finding an adapter and based on advice from Mack Boring, tapped my engine to accept an NPT oil sending unit, Just put grease on the tap to trap any metal particles.

I would also say that if the plate is iron, then if you can’t find a bronze plug, and iron one ought to work. Iron plugs are common in house plumbing.
But the brass one will work, but I’d replace it eventually
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