I'll stick my foot in my mouth now=)


I think I've seen that in the M103 engine stuff. Yes, you can helicoil it. I'd buy the set from a machinist supply company instead of an Auto parts place. They make different tolerence tapes and different length coils. You want the 3B or maybe it's 3A standard. One being the bolt and one being the nut standard. 2A/B is looser fit.
Standard kits are either 1.5 D or 2 Diamenters in length. They make them in 1-5.0 diameters. Use grease on the tap. Go 2X as much counter clock wise for every 60 degrees to break the chips. Clean the tap fairly often.

If you don't have a good machinist supply company- go to mcmastercarr.com.


Michael

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Michael McGuire
83 300d
01 vw A4 TDI
66 Chevy Corsa
68 GMC V6 w/oD
86 300E