You should use the proper Heli Coil steel inserts intended for spark plugs instead of the wound wire Heli Coil inserts which are good for bolts and machine screw threads. The steel inserts lock into the head while the wire ones don’t and are sealed using red hi-temp silicone.
New threads are cut into the head using the special tap supplied in the kit, sealer is applied before winding the insert in and then it is staked to the head using the tool supplied. To get the insert in straight, it’s best to remove the head and using a drill press, start the tap by hand and finish using a wrench or a socket. This method only works on heads with the plug pointing straight out and not on an angle. The threads could also be repaired without removing the head but you’ll have to make sure the tap starts into the head straight and lots of light grease is used to prevent any chips from falling into the cylinder.
-
This reply was modified 4 years, 5 months ago by
.
-
This reply was modified 4 years, 5 months ago by .
-
This reply was modified 4 years, 5 months ago by .
