Welp! Stripped a motor mount bracket bolt hole in the body. What now?

[redneck truck]

Finished up the oil cooler reseal and installed the alternator and the subframe, and while snugging up the bolts that secure the lower motor mount/swaybar bracket to the body, I got a nice "pop," and then the bolt was loose again. When I pulled it out, it had all the threads of the hole on it.

The reason for my post is that I want to make sure there is no reason I shouldn't heli coil that hole. It's not the hole for the main subframe bolt, but one of the smaller M10 bolts forward of the main bolt. Has anyone done this and lived to tell about it?

[Gumby]

Seems like a good way to fix it. My only concern would be how thick the metal it's going into is.

[A62TURBO]

Helicoil is ok, but I would prefer using a timesert.

[julex]

I would just go one up M12 and done. Just upping the bolt will be much better than doing the same (chasing with M12 or whateve M10 timesert will require) and using insert with the same little bolt. Here you can up-size the threads without ill effect, unlike some other places like heads.

My car has quite a few places where bolts are larger than stock

[redneck truck]

Gumby, your concern is mine as well; on my TT, the bolts that secure the engine mounts screw into holes that are barely thicker than sheet metal; if I drilled them out 2mm bigger, there wouldn't be any material left to thread. I don't know if the subframe and supporting bolts are that way or not. Does anyone know for sure?

[redneck truck]

Also, for reference, the bolt is N-906-630-01, M10 x 70 sw18 (not sure what SW indicates). I know it's an M10, and I do not know the thread pitch. Anyone know off hand so I can order the proper helicoil kit?

[Hambone101]

Why not take the bolt to a hardware store and check the pitch there? More than likely it's going to be either a 1.25" or 1.5" pitch.

[A62TURBO]

If you take it to Home Depot they have a thread guide you can use.

[Gumby]

So if metal thickness is a concern, how about drilling it out, and using a nutsert?

[redneck truck]

Time Sert installed, problem solved. Huge thanks to the dealer tech that gives me shop supplies and lets me borrow his tools.

[Sparkstack]

Also, for reference, the bolt is N-906-630-01, M10 x 70 sw18 (not sure what SW indicates).

SW is the socket size needed to drive the bolt.

[redneck truck]

Wow, that's good to know. Certainly nice when you're shopping for OE hardware for a one-off job.