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Old 09-01-2012, 03:27 PM   #1
KG6BWS OP
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Engine case repair for emergencies

After dropping my bike on a rock a couple weekends ago, and leaving a few nice little scars on the side case, Ive been thinking about what I would do if I had cracked, or even holed, the case.

Whats the concensus on carrying some aluminum sheet and JB weld?? A little sand paper to clena it up, and a small amount of oil to pour back in. I think it would work.

Pieces of aluminum wouldnt have to be big. Maybe 2 or 3 1" square pieces. THey could be pieced together to cover a small or crack. Frankly anything bigger than that, more than likely wouldnt be repairable anyways. At least not out the middle of nowhere.
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Old 09-01-2012, 03:55 PM   #2
stainlesscycle
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quicksteel is much easier to work with in the woods, and would adhere better temporarily, and much quicker to work with.. a couple small squares of aluminum might be handy. you'd alos need some kind of universal oil depending on what broke. atf comes to mind...
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Old 09-01-2012, 04:06 PM   #3
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I've seen case repairs done in the field with a beer can and JB Weld. I have no experience with Quicksteel. You'll want some sort of solvent to clean the oil off the damaged area. If you're already carrying an alcohol stove and a bottle of Heet (or other methanol-based fuel) it works pretty well. Don't drink it or pour it over your head.
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Old 09-01-2012, 04:06 PM   #4
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Hmm, I like that better. More easily stored since its not a liquid like jb weld.

Have to pick up a tube of it and try it out.
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Old 09-01-2012, 04:11 PM   #5
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Id suggest a little rubbing alcohol for surface prep too.
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Old 09-01-2012, 04:15 PM   #6
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Originally Posted by Danjal View Post
Id suggest a little rubbing alcohol for surface prep too.
You actually don't want rubbing alcohol as sold in pharmacies, as it contains oils and a great deal of water. Denatured alcohol, methanol (toxic) or even high-proof booze is better. In a pinch, scrub the area with gasoline.
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Old 09-01-2012, 04:15 PM   #7
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Id suggest a little rubbing alcohol for surface prep too.
Yeah, I thought of that too. I carry a first aid kit that has alcohol wipes in it. Those should suffice.
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Old 09-01-2012, 04:24 PM   #8
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rubbing alcohol is normally 70% and has a high percentage of oil in it.
But, it can be found at higher percentages, up to 99%.
70% rubbing alcohol will not dry the surface as well as fresh gasoline. imo

JB Weld is pretty good but Devcon 5 minute epoxy might be better, Lowes has it.
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Old 09-01-2012, 04:30 PM   #9
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JB Weld Worked Once

I drove an 83 V45 magna off a small curb in Sierra Vista AZ. I loved the bike. The curb pulled some fins off the bottom of the motor, gassed it unaware of the massive oil spill soaking the back tire. Slick as snot. Thought I ruined the bike. Gave to a friend. He JB welded a piece of steel and drove it for years.
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Old 09-01-2012, 04:37 PM   #10
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In 1990, I patched a penny sized hole in a case on my CB750 with nothing but JB Weld. No prep, no cleaning....no leaks. I would prefer good prep, but at the time it just was not in the cards.
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Old 09-01-2012, 04:39 PM   #11
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Any reason epoxy wouldn't work? There is a variety of cure times and it sticks pretty well.
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Old 09-01-2012, 04:51 PM   #12
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Quote:
Originally Posted by OldPete View Post
rubbing alcohol is normally 70% and has a high percentage of oil in it.
But, it can be found at higher percentages, up to 99%.
70% rubbing alcohol will not dry the surface as well as fresh gasoline. imo

JB Weld is pretty good but Devcon 5 minute epoxy might be better, Lowes has it.
Ive actually got 99% rubbing alcohol. Use it for cleaning the ends of HDPE pipe when fusion welding it. Im thinking of the alcohol wipes though since I already carry them in my first aid kit and this would be purely for emergency fixes.

Want to keep what I carry to a minimum while still having a fairly comprehensive kit. I ride pretty exclusively alone. On and off road. So I rarely ever have anyone around to help.
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Old 09-01-2012, 06:02 PM   #13
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Quik set epoxy and a hand full of spare change in my tank bags, solvent to clean the area is in the gas tank.
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Old 09-02-2012, 01:25 AM   #14
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I've seen a video (can't remind where) about repairing case cracks with a soap bar.
Just push and rub it over the crack (rub it in a direction perpendicular to the crack so the soap can fill it).
It looked effective, but i haven't tried by myself.
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Old 09-02-2012, 04:29 AM   #15
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Quote:
Originally Posted by OldPete View Post
rubbing alcohol is normally 70% and has a high percentage of oil in it.
But, it can be found at higher percentages, up to 99%.
70% rubbing alcohol will not dry the surface as well as fresh gasoline. imo

JB Weld is pretty good but Devcon 5 minute epoxy might be better, Lowes has it.
First time I've heard of oil in iso. Maybe its not listed? Its worked well as a cleaner for refinishing and small jb weld projects. Im using 99% BTW. Brake cleaner works well too,but I wouldn't pack it on a trail. The gas idea is a good one. Easy enough to pull a carb hose too. Learn something new every day.
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