Came across a minor issue yesterday, the crests of the threads had finally pulled out on the oil pan drain plug hole.
So, it was off to find a Heli-coil to fix this minor issue, but instead I found a “Fix-A-Thread” kit at Auto-Zone. It looks like it might hold up better than a Heli-Coil in this application.
The kit contains the following tools and inserts. Top is a drive punch to flair the insert once installed. The tap is 3 in 1, M14 x 1.25, a cutter to get to the larger thread, and then the larger thread sized for the insert (not sure of the size/pitch). Three lengths of inserts were included, and all for about $30. They do carry inserts individually for about $10 for six various sizes. 2 of each pictured from what I could tell looking at the package.
A close up of the inserts. The knurled end goes towards the outside of the thread being repaired. The flair tool spreads out the top of the insert to help retain it in the part.
First, the threads that had pulled at the crests were picked out, and the tap tool was used with tap fluid to cut the new threads for the insert.
After cleaning/degreasing the newly threaded hole the instructions say to apply “high-temp silicon,” but instead I chose to mix up a small portion of JB Weld to apply to the female and male threads before installing the insert. I used a M14 x 1.25 bolt to drive the insert into it’s new home, and then wiped off the excess epoxy. Next, since I used the middle length insert it protruded a few mm above the base of the oil pan, but this was relieved by using a Drimel tool with a thin grinding wheel.
The thread insert was chassed with the M14 x 1.25 portion of the tapping tool to clean up the threads where grinding the relief may have booged up the threads.
From the outside it looks like so.
From another angle. Problem solved.
Next up will be the TPS installation. I had taken some pics, but they are not the clearest.
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