My brother, in his wisdom, drilled too big a hole in a cast-iron rear suspension knuckle on his car (actually a Honda Accord, identical to a TSX, though). Does anyone have any experience with JB Weld or similar products and how strong they'd be in repairing a cast iron piece? He'd probably glop it into the too-big hole, let it set, and then drill it out to proper size. The hole is for the through-bolt on the lower shock mount.

Thoughts? (Yes, I know, I'm the DIY king.)

 

Wouldn't the wiser and surely safer method be to buy a larger bolt?
Suspension, cast iron, welding, cast iron - did I mention cast iron?
For a porous material, it's good, but I'd not be remotely secure in the knowledge of someone welding to it, with the sort of stresses and strains it'll receive.

 

Any pics?

 

No, no pics unfortunately. It's not just an oversized hole, it's more of hole drilled next to a hole, making (loosely) an "8" and one of the loops of the "8" needs to be filled in or the bolt can shift from one side of the "8" to the other.

That's the best description I can think of. I thought it could certainly be welded or even filled with a high-strength epoxy like JB Weld. He's not bonding two broken parts together, more trying to fill a void.

 

Whats with the "knob" avatars lol...

 

Without a pic, I'm not 100% clear why/what you're trying to do. Considering the strut to knuckle connection supports the entire weight of that corner of the car, I'd say it's not a good idea to half-ass repair the knuckle. How much fun will it be to have one side of the rear suspension collapse at 70+MPH?

So why was he drilling a hole in the knuckle?

 

I'm pretty certain I was first to the party with a shift knob avatar. Shamelessly, JTso ran out to his car and took an identical photo and posted it. I don't know, I think he's a little upset that, after making painstakingly crafted and beautifully welded parts for his TSX (hi-flow cats, ETD, oil catch cans, etc.), I've slipped in here and claimed the DIY title with my half-ass projects made out of cardboard and storm door parts.

Yeah, right.