Jan 10, 2015 - A standard Helicoil CANNOT be used for spark plug thread repair. Refer to the instructions in the kit, but most follow this general procedure. My Helicoil Sav-A-Thread kit arrived the other day, so after reading the instructions I decided to give it a try. Fortunately, the original port had one full thread left and that was just enough to catch the lower threads on the tap. I had intended to remove the head first, but changed my mind and decided leaving it mounted on the engine would give me a good stable platform to work on. I'll remove the head afterwards and clean out any chips and do a de-carb at the same time. The pictures show the tap started into the port with lots of thread cutting oil applied. After every few turns I would remove the tap and clear away any aluminum chips. As the work progressed I became concerned that the tap was not going to be able to be fully threaded into the port as it looked like the end of the tap was going to contact a 'bump' inside the head. That is exactly what happened and in one of the pictures you can see a shiny crescent line where the end of the tap hit that bump. Fortunately the main tap had already cut all the way through the head, so I believe the shortest insert will screw all the way in. If not, I may have to cut off the small end of the tap and continue cutting threads until the tap bottoms out as outlined in the instructions. These kits can be purchased fairly reasonably on Amazon or other on-line sites and so far, it has worked great. The instructions advise that if there are no original threads left, you should drill out the head with a 5/8' drill. I am glad I did not have to do that! I would have been concerned about proper plug alignment. I hope this helps anyone who, (like me) has never had to do this before. Thank you for the write up on the procedure; and pics. For future reference, a tip. Apply grease to the hollows of the tap as well as on the threads. The grease will trap the shavings in it. Turn a couple of turns, remove, clean shavings off, re grease, repeat. Keeps them nice and tidy. Keep in mind: This film may be your final warning to remind you of death! It is a short and deceptive life in which worldly desires seem fascinating and full of promise, but the truth is much different. Harun yahya wife. In this film you are invited to see the true nature of our worldly existence. And lead you to rethink about your duties to God and the hereafter. I always use this method when chasing threads for head bolts when head is removed. Make sure those threads are good and clean, otherwise you may be working against dirty threads when you are torquing head bolts and not the bolt tightening itself. False reading; incorrect or unequal crush of head gasket - blow out area. ![]() Thanks guys, Jeffro - I knew about using grease to capture the chips, but as I intended to remove the head anyway so I could see what things look like in there, I opted to just use cutting oil. However, I WILL use that method when chasing the holes for the head bolts. ![]() - Thanks for the tip. MI Fan - Awwww, buying a new head would have been too easy, besides you probably get more for them with shipping on top, than I paid for this thread saver kit with FREE shipping. (Gads, I love FREE shipping!!) J-Badman - The kit comes with a swaging tool and the instructions advise you to smack it smartly several times with a hammer. However, it says not to hit it 'too hard', (whatever that means!). It looks to me as though the swaging tool slightly expands the top four threads of the insert which have little 'teeth' cut into them. I assume hitting the tool expands the insert and drives the teeth into the threads in the head slightly at the same time. Also you are instructed to use some Hi-Temp Silicone on the outside threads of the insert.
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