Junkyard EJ22: checking condition before transplant?

[jarl]

Thanks for the reply

Can you confirm the size of the helicoil? The exhaust studs are M10x1.25, but you say the helicoil would help for M12?

 

To be honest I have read about helicoils failing on some of these repairs, probably because of a bad installation, but since I have never installed one of these nothing guarantees I won't screw up this. I found a similar kit slightly cheaper from a nearby ebay seller -no shipping, which makes them attractive- but I'd rather not have this thing failing in the near future. I saw other people suggesting GM 7/16" exhaust studs as well, but I couldn't find one long enough at Autozone (and was black oxide as well... will rust easily), and I have seen several different pitch mentioned.

 

There are a few other options (time-serts, solid inserts, etc.) but a) timeserts are quite expensive and I have not seen any mention of the solid inserts (i.e. McMaster 97120A125) around here.

[MilesFox]

whoops! i meant to say 10x1.25 A helicoil set should come with a tap, inserter, and the proper size drill bit. Just make sure to not drill beyond the bore. You really only need to drill about 3/4 the way up.

 

The inserter is key to success on the helicoil, there is a barba at the end of the coil the inserter grab onto to thread in, and the coil stays when you unscrew the inserter.

 

I can imagine inserting the coil with the new stud, and that could compromise the torque on the coil.

 

you can use a threadlocker on the coil when you insert it.

 

the 7/16 gm stud is a workaround of the helicoil, since you are just boring out the hole larger, using a coarser thread. I would think that a courser thread wont hold torque as well, or may need more torque than what the aluminum can hold.

 

if you have a hard time finding studs, you can buy the dorman 'help' brand "gm/toyota exhaust manifold" hardware kit (corolla, prism)

This kit will come with 3 studs and nuts, and 2 bolts. The extra bolts can be used elsewhere on the car in most places(AC bracketry, alternator, drivehaft carrier, seats

 

Thanks for the reply

Can you confirm the size of the helicoil? The exhaust studs are M10x1.25, but you say the helicoil would help for M12?

 

To be honest I have read about helicoils failing on some of these repairs, probably because of a bad installation, but since I have never installed one of these nothing guarantees I won't screw up this. I found a similar kit slightly cheaper from a nearby ebay seller -no shipping, which makes them attractive- but I'd rather not have this thing failing in the near future. I saw other people suggesting GM 7/16" exhaust studs as well, but I couldn't find one long enough at Autozone (and was black oxide as well... will rust easily), and I have seen several different pitch mentioned.

 

There are a few other options (time-serts, solid inserts, etc.) but a) timeserts are quite expensive and I have not seen any mention of the solid inserts (i.e. McMaster 97120A125) around here.

[jarl]

http://www.youtube.com/watch?v=2kTv3GlLxyA O.O

Now... If I could only find them...

 

Edit: Cross that. I did find them, but they have a minimum order (12 inserts), and that amount to more than what a Time-sert set costs

Edited July 6, 2011 by jarl