40c transmission leak

fundytides · Post by **fundytides** » Wed Nov 27, 2013 12:03 pm

I recently overhauled the steering clutch in my 40c. In the process I found that someone had previously striped the threads for the front lower clutch housing bolt. Their solution was to drill through the boss in the transmission and put a nut on the inside. I didn't think that this would create a problem but on reaasembly I now have an oil leak between the clutch housing and the transmission case. Since the nut on the inside is ahead of the ring gear it is difficult to get a wrench on to tighten properly. I have the final driver off again and am about to drain the transmission and remove the rear cover in an attempt to get at the nut. Any suggestions as to a sealer to put on the bolt where it comes through the boss to help cure the leak? I'm hopeful that I can hold the nut enough to tighten it so that along with a proper sealer, I can at least reduce the leak or preferably eliminate it. Any suggestions are appreciated

Gil · Post by **Gil** » Wed Nov 27, 2013 12:45 pm

This might be the time to take an old flea market wrench and use your torch to cut and bend it into a shape that will fit onto the nut. If you can remove the nut, you would be much better off putting a seal (rubber, leather, etc. washer) between the nut and the case. Any liquid sealer or epoxy you just pack around the nut will not likely work. Gil

Timberwolf13 · Post by **Timberwolf13** » Wed Nov 27, 2013 6:42 pm

I agree. Most likely the liquid alone will get hot and fail after a lil while. I'd try What Gils saying. Just make sure to use a heavy rubber if you have to cut your own, so it will last longer. Maybe from an old mud flap or something like that. Then use some heavy duty rtb or the like, to coat the surfaces when you put it back in and tighten it. That should do you good for quite a while.
Any chance you can weld or braze it into place? It would keep it from turning and you could close up the leak as well. I figure that'll be worst case scenario though. I've had some good luck melting a lighter gauge metal in place to make a seal before too.

Post by **Lavoy** » Wed Nov 27, 2013 11:13 pm

IF you can get at it enough to do it, a good coating of JB Weld will be oil tight if you can get the surface completely clean around it.
Lavoy

DukeofDeere · Post by **DukeofDeere** » Thu Nov 28, 2013 5:53 am

Any chance of drilling and tapping it out for a larger bolt?
Then all you need is thread sealed and never have to remove the cover and all again.
Just my thoughts...

Duke

Post by **Lavoy** » Thu Nov 28, 2013 9:20 am

Probably not enough room to go to 3/4", hard to get a nut on the 5/8" stud.
Lavoy

DukeofDeere · Post by **DukeofDeere** » Thu Nov 28, 2013 10:55 am

11/16 is an option. Fine thread would be better.

Duke

DukeofDeere · Post by **DukeofDeere** » Thu Nov 28, 2013 11:03 am

Could even use a helicoil thread repair kit and go back to the original bolt size.

Duke

DrLoch · Post by **DrLoch** » Thu Nov 28, 2013 1:17 pm

If you have enough room to work I would use a timesert, I've found them to be much stronger than a helicoil. Look at the link, Http://www.timesert.com/html/faq.html

Used those to repair my Cadillac Northstar when it pulled the head bolts.

Dennis

jtrichard · Post by **jtrichard** » Thu Nov 28, 2013 2:08 pm

i just watched timeserts video and they look like the thing to use for all thread repairs

DukeofDeere · Post by **DukeofDeere** » Thu Nov 28, 2013 2:25 pm

Timesert looks like the way to go!

Duke

Post by **Lavoy** » Thu Nov 28, 2013 8:26 pm

Keenserts is another brand, but several out there with no particular name. This type of repair is pretty much the only one I will use. I never use Helicoil unless for some reason I have no other option.
Lavoy

fundytides · Post by **fundytides** » Fri Nov 29, 2013 11:52 am

Thanks to everyone for all the great suggestions. I put some good quality thread sealer on the bolt, a fibre washer under the nut and was able to get an old l shaped socket handle, that I've had for 50 years and seldom used, in past the ring gear to hold the nut while I tightened the bolt. Filled the transmission and everything looks ok so far but I'll leave the final drive off for a day just to be sure. Thanks again.

DrLoch · Post by **DrLoch** » Fri Nov 29, 2013 5:22 pm

Lavoy wrote:Keenserts is another brand, but several out there with no particular name. This type of repair is pretty much the only one I will use. I never use Helicoil unless for some reason I have no other option.
Lavoy

First I've heard of them, looks good as well. Thanks

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40c transmission leak

40c transmission leak

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