Serious Help Needed

[TheCafeKid]

The bike was rear ended by a pickup truck. If the impact was hard enough to crack the engine case wouldn't it seem just the tiniest bit plausible that the bike may have suffered some other damage?

This whole attitude of "slap some filler on it and ride it" has me baffled. I could understand if the crack was on the stator cover but this is a structural mounting point on the engine block. Without inspecting the block how can you tell the extent of the crack? The cases may very well be paperweights.

Andy I am not putting you down for your concern. It's valid. But here's he deal ; if that were an ear type mount, with just a shoulder bolt or whatever I wouldn't chance it at all. Like I said I know what would happen if that would come loose just from being stupid enough not to put the front mount in my old 750cafe. Like I said it tried to Jack the motor back in the frame. But these mounts aren't designed like that. It a through bolt. There is substantial meat built into that setup, plus the lower mounts and the othe side mount and the rear mount. IF he can get the weep to stop, which may not happen, I wouldn't be super concerned about it's structural integrity. The motor isn't going to come apart go flying backwards or the crank go busting out the bottom of the cases. There are too many other mounts in it. I am simply saying best case scenario, try to stop the weep and or deal with it, find another set of cases, prep and paint em and make em look all pretty and ready to rock and then swap the stuff over. Parts have already been bought, at worst it's another set of gaskets. In the mean time, check it out and if it seems ok, ride the snot out of it. Just my .02. I've seen people ride or do things to their bikes on this forum that have much more substantial integrity issues than this.

 

[salty_monk]

I have used a product they sell everywhere with great sucess bet it would work here. Temp resistance vibration and adhesion are great.
It's called something like househould glue but it's a silicon product that's highly adhesive.
I think it's GE branded. I will get some info or a pic of it later if you want.
JB weld would prob look better but this stuff seals better and stays flexible too

 

[WilliamGLX81]

Here are my 2 cents:

Why did the crack appear there? Because that point was under stress during the collision. Which probably means it's under stress in general... And it's an engine mount bolt.

The oil presents a problem - if it's not cleaned out. I've taken a welding class, and the oil will cause porosity in the welds - porosity = weakness. With enough solvent, you can get it clean and make a good weld.

With the time it will take to pull the engine, crack the cases, clean it, weld it, reassemble it.... That's some time and money.
The other problem is that you can see this crack. Aluminum is cast, which means it's very rigid, and consequently brittle. I would bet there are more cracks you can't see.

I think it's going to save you time and money to replace the cases than to try to put out a bunch of small fires. It may be that you have found the only cracks, which are visible to the eyes, and can be welded up.
It may be that there are more, and what will you do if you weld up these and still have leaks, or worse - you have weak spots in the cases you won't see for 1,000 miles or 50 heat cycles.