reactone

I just realized today that my drivers side engine mount is totally stripped. I was putting my block together and the threads just literally fell out, leaving a perfectly round hole in the block. I want to heli-coil the hole but I was wondering if you could stack the inserts, because it seems that for a m10x1.25, they only have 10mm and 15mm inserts. I dont think they'll be deep enough. Anyone stack them with success??

EF9_808

My dad's a machinist and he always tells me that as long as the thread grabs a 1/4 of the overall diameter of the bolt it will be at full strength. So I wouldn't worry about it, the bolt holes for the trans I bought were all stripped so I helicoiled it the actual thread replacement is only an inch long but it hold fine.

turbodx190

yes you can stack them no prob.
do it on my warrior exhaust stud put two the were only 1/4 in.
holding great

reactone

Cool, thanks for the help, I was a little nervous being that they were for a motor mount and all but there are three bolts holding it on. My brother (a mechanic) actually said that the heli-coils are stronger than the factory threaded holes. It just sucks that the kits are so expensive. We went to his work where they use time-serts (similar to heli-coils) but they didn't have 10x1.25, just 10.5.

Bone1

JB weld it!!!!!!!!!

Well, we had to get the engine in, in a hurry, but it never fell out.......

reactone

That definitely crossed my mind.

rsmith2786

I would just retap the hole and use a bigger bolt. No need to over complicate anything.

reactone

Well, If used an oversize bolt, then I am going to have to find grade 8 or better bolts in the new size, so I just said the hell with it and bought the heli-coil kit from Amazon.com. I had a bunch of free gift certificates from whoring online casinos so it didn't cost me anything.