Patched my cracked alternator cover with JB weld last night... hammered the dent back outwards as much as we could, roughed up the outside, and dremel'd some grooves over the cracks to have more hold. Cleaned up with degreaser and acetone. Packed the putty in tiiiight.
Sanding up today after work, then hopefully everything back on for a test ride to make sure all is well!
It should work IMO. Degreasing was the most important part. There is no stress or pressure on the cover, oil is flung around but pressure is lost once it exits the crank. It just pools at the bottom and runs back into the crankcases and down to the sump. Good luck!
There would be some heat expansion and contraction, but not so much the JB can't handle it I think.
Hi-Temp JB Weld did a fantastic job! Sanding it down to match countours was no problemo. It is just a different colour now, is all. I also put some Permatex Form 2 around the rubber grommet for the wires coming out of the cover. If the Cash Gods are fair to me this winter, I will likely order an OEM cover.
...but what and adventure I had to endure last night!
I get everything all bolted back together on the inside and I am on my LAST bolt at the bottom (PO put stainless allen bolts on everything, how nice!), and hear the dreaded "tink-tink-tink" and loss of tension that indicates stripped threads...
I only was doing hand tight and then 1/4 turn with the ratchet. Luckily for this situation, the bolts the PO put on were a few mm shorter than stock, so I only lost a few threads. I popped down to the hardware store, bought a M6x40mm pan head to hold me over. The distance from the top of the cover's hole to the back of the case hole (threaded all the way through, thankfully!) is 40mm. Before I got that bolt on, the cover was leaking as bad as it was before the hole was fixed! Left it over night and no leaks on the garage floor this morning.
WHEW.
Now to put in an order for some CORRECTLY sized allen bolts... and do something nice for the wife since I spent the whole night in the garage...
"But babe, every minute I'm not trying to fix this problem, money is
literally figuratively dripping out of my bike."