Here is an example of how to do a heli-coil install. This was done on the aluminum head of my Olds Achieva Quad 4. However, the procedure is the similar regardless of. More How To Install A Helicoil In Aluminum videos. Here's how to install different kinds of HeliCoil inserts. The original hole in this aluminum windshield frame is not stripped, but it is not far from it. Helicoil Installation. The M42 valve cover uses M6 bolts so you need to pick up an insert kit for that size like the one shown below. My kit included ten inserts, a tap, and a special tool that allows you to drive in the insert as well as compress it for easier installation. However, you need several more tools to complete the job.
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If the hole is truly stripped then the technique in this guide won't work because the hole would then be larger than it was originally and the tap won't bite into the metal and therefore not cut any new threads. So then there are two options:. Choose the next larger size bolt and drill and re-tap the hole to fit that larger size. Or if you really must use the same size bolt then:. Use a helical insert (aka 'Helicoil') which is a coil of hardened steel wire that forms both a outer and inner thread..
I used option #2 to fix a stripped hole in a bicycle shock absorber. I bought the Helicoil kit sized for my bolt from a automotive supply store. The kit came with the drill bit and tap sized for the outside threads of the coil. I drilled the hole, tapped the threads, then threaded the coil into the hole. The inside diameter of the coil was sized to fit the original bolt. Don is correct that tapping the hole as it exists won't really work and offered some viable solutions.
However, if there isn't enough material for a Helicoil to bite into it won't work either on a through hole and sometimes using a larger bolt isn't an option either. In such cases you can add some filler to your existing hole. JB Weld can work as a filler for aluminum. If you apply a thin enough coating, you can tap the hole after it cures without drilling - then use a Helicoil for strength.
Option 2 would be to use an aluminum filler rod and a MIG welder to fill, then drill and tap the hole. It's time to speak out for your right to repair We have a chance to guarantee our right to repair electronic equipment—like smartphones, computers, and even farm equipment. This is a once-in-a-generation chance to protect local repair jobs—the corner mom-and-pop repair shops that keep getting squeezed out by manufacturers. Join the cause and tell your state representative to support Right to Repair. Tell them you believe repair should be fair, affordable, and accessible. Stand up for your right to repair!