Author Topic: Stripped Drive Shaft Drain Plug: Temporary Fix?  (Read 612 times)

Offline jp9094

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Stripped Drive Shaft Drain Plug: Temporary Fix?
« on: August 07, 2020, 12:37:33 PM »
Hi All,

Just changed the fluids on my '83 r 65 LS and found the drain plug for the drive shaft stripped. I am aware I can use a helicoil etc or even an oversize plug (after tapping the old hole).

However, I want something to temporize it while I decide what to do. Any ideas?

TIA
"It's what you learn, after you know it all, that counts"

Offline wilcom

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #1 on: August 07, 2020, 03:10:21 PM »
Might try some teflon tape and wrap a bunch on the plug trying to feed enough in the threads to get a bite........?
Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
1982 BMW R65LS 
past:
1979 R65
1980 R65
1982 R80RT
1974 R90/6
1972 R75
1964 R50/2
19xx R27
ZX-11

Offline Aethelric

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #2 on: August 08, 2020, 02:29:03 AM »
Try to seal it with something like Hylomar.
After tightening it as far as possible, use a jubilee clip (a hose grip) around the whole assembly to push it in and keep it in place.
I ran mine like this for a few years before I got around to fixing it when I did a rebuild.

Offline jp9094

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #3 on: August 08, 2020, 02:45:36 PM »
Many thanks for the replies! I was wondering if a larger size bolt (The original is an M12 X 1.5) ie a M13  X 1.5 or even an M12 X 1.75 would also work? What do you guys think?

TIA
"It's what you learn, after you know it all, that counts"

Offline wilcom

  • Posts: 1485
Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #4 on: August 08, 2020, 07:47:47 PM »
If your going to fix it later you might try the same M12 but a different thread 1.0 or 1.25 the interference might just tighten it up
Joe Wilkerson
Telephone man with a splash of Data
Menifee, CA

Present:
1984 BMW R65LS "Herr Head"
1982 BMW R65LS 
past:
1979 R65
1980 R65
1982 R80RT
1974 R90/6
1972 R75
1964 R50/2
19xx R27
ZX-11

Offline Tony Smith

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #5 on: August 09, 2020, 02:30:05 AM »
Quote
Many thanks for the replies! I was wondering if a larger size bolt (The original is an M12 X 1.5) ie a M13  X 1.5 or even an M12 X 1.75 would also work? What do you guys think?

TIA

If a 12mm thread has stripped out, you are not putting another 12mm bolt in there regardless of thread pitch.

I think 13mm is OK, but you will need to drill and then tap the hole anyway.

A Helicoil is a good repair, a Timesert is even better. Removing the final drive is not a big chore. You really should take the FD apart to ensure removal of all swarf etc. but liberal flushing with kerosene or BrakeKleen or similar after will probably remove the swarf (if a late model removing the vent will assist in the process, otherwise use the filler).

If you want to think about thinks for a while, spray the existing drain plug with CRC/WD-40 or similar and then liberally coat with Devcom expoxy before re-inserting the plug. Another alternaitve is to visit somewhere like Jenkins Rubber and purchase an emergency push-in rubber bung, being in mind that if other bodge fails you are buying a new final drive.
1978 R100RS| 1981 R100RS (JPS) | 1984 R65 | 1992 KLE500 | 2002 R1150GSA |

Offline tunnelrider

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #6 on: August 09, 2020, 05:44:51 AM »
Hey jp, I found my shaft drive drain thread had been stripped when I first did all the oils in my ownership seven years ago and still haven't done a permanent fix. Initially I was kind of amazed it hadn't loosened itself and fallen out beforehand. Back then I re-tapped the drain plug internal thread with the bike on the centre stand, pretty inaccurate but it sharpened up just enough to have the plug thread up (reusing the two existing washers that were on the plug ).

Obviously that wasn't going to last and I persevered with a weeping plug for the last three or four oil changes before it got too bad to be a concern. I tried plumbing thread tape but that was no good, now I have it sealed with Loctite thread sealant, meant for steam pipes, did that less than a year ago so haven't had the need to change the oil yet and can't tell you if the plug's reusable but I presume it should be able to be taken out, plug threads cleaned up and re-applied again. I'll repost with a result in a month or three. It has however definitely stopped the oil weep!

Reading Tony's post I wish I'd had the nerve to helicoil it when I had the final drive unit off the bike to replace the swing arm/ final drive gasket which was weeping also, I didn't because I was afraid the swarf would get in the final drive... I should've asked the question at the time as it sounds like you can flush out the swarf relatively easily.
A helicoil isn't too hard to do.
I'll post the Loctite thread sealant number when I get to my garage next, in a day or two.

« Last Edit: August 10, 2020, 02:29:11 AM by tunnelrider »
'85 Black R65 / '74 GT185 / '83 Pantah 500 / '90 Super Tenere 750  / '01 DRZ400 dirt only

Offline tunnelrider

  • Posts: 321
Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #7 on: August 10, 2020, 02:56:51 AM »
The thread sealant I used to solve the weeping plug is Loctite 5770. Reading from the Loctite website it says it is:
'Designed for locking and sealing metal threaded pipes and fittings in industrial applications
Prevents loosening and leakage from shock and vibration
Particularly suitable for sealing steel metal joints where high temperature and high pressure resistance is required'
It may not be a good choice.  I had a tube given to me by my father who's pretty good with mechanical things and I didn't read up on it before I used it, perhaps it'll be perfect or perhaps I'll curse it.  I'll definitely post further down the track but that doesn't help you right now.

One thing I thought of after trying teflon thread tape is that old style plumbing hemp rope with plumbing grease, used for everyday plumbing with galvainised steel water mains pipes, might be worth a go, since it's much more suited to metal/metal surfaces and filling voids rather than teflon tape.
« Last Edit: August 10, 2020, 03:08:03 AM by tunnelrider »
'85 Black R65 / '74 GT185 / '83 Pantah 500 / '90 Super Tenere 750  / '01 DRZ400 dirt only

Offline jp9094

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #8 on: August 10, 2020, 10:45:33 AM »
Hi All,

Many thanks for the advice. I have found on Amazon a: "Supercrazy M13 X 1.5MM Oil Pan Drain Plug Thread Repair Tool Kit SF0087B". This consists of a 13 mm tap and 6 13 mm x 1.5  plugs. For US 4 14.99 and free shipping I thought I might give it a go. It arrives tomorrow! Wish me luck.

TIA
"It's what you learn, after you know it all, that counts"

Offline jp9094

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #9 on: August 10, 2020, 10:46:34 AM »
That's US $ 14.99 !
"It's what you learn, after you know it all, that counts"

Offline Luca

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #10 on: August 11, 2020, 08:17:47 PM »
Just make sure to take the washer for your larger plug and verify it fits the machined surface that it seals against before you enlarge the hole!

Offline mrclubike

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #11 on: August 14, 2020, 11:56:34 PM »
Quote
That's US $ 14.99 !

I did not know they made such a thing   

I think it will work good
I would definitely   remove the final drive
You will see there is not much room below the hole for the tap to run thru
So you may have to tap as far as you can and then cut the tap off a little and cut a little deeper
1982 R65 running tubeless Snowflakes
2004 R1150R

Offline jp9094

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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #12 on: August 15, 2020, 11:15:27 AM »
Fail ! I found it impossible to tap the damaged thread given I had to do it on my back in a poorly lit garage. I have (in the distant past) used a tap and die set before. I could not get enough of a mechanical advantage to start the tap. I would have to remove the drive shaft and put it in a vise to do it.

I have temporized it with a rubber bung and a hose clamp as was suggested, and it seems to be working fine so far. Many thanks for the suggestions and encouragements!

FWIW,
"It's what you learn, after you know it all, that counts"

Offline jp9094

  • Posts: 146
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Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #13 on: August 15, 2020, 11:16:41 AM »
Fail ! I found it impossible to tap the damaged thread given I had to do it on my back in a poorly lit garage. I have (in the distant past) used a tap and die set before. I could not get enough of a mechanical advantage to start the tap. I would have to remove the drive shaft and put it in a vise to do it.

I have temporized it with a rubber bung and a hose clamp as was suggested, and it seems to be working fine so far. Many thanks for the suggestions and encouragements!

FWIW,
"It's what you learn, after you know it all, that counts"

Offline tunnelrider

  • Posts: 321
Re: Stripped Drive Shaft Drain Plug: Temporary Fix?
« Reply #14 on: August 15, 2020, 02:58:37 PM »
Sorry to hear jp - yep it's pretty hard to get accurate in that position.  Since you'll probably take the final drive off to fix the problem permanently I'd use a 12mm helicoil  rather than tapping a new 13mm hole, will be far easier I think.
« Last Edit: August 15, 2020, 03:02:16 PM by tunnelrider »
'85 Black R65 / '74 GT185 / '83 Pantah 500 / '90 Super Tenere 750  / '01 DRZ400 dirt only