Reply To: Johnson QD-15 Helicoil in exhaust housing

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April 4, 2020 at 12:04 pm #199115
Mumbles
Participant

    Not sure where you got your inserts from but they can’t be genuine Heli-Coils as Heli-Coils are made of stainless steel and not carbon steel. Being made of stainless, they are perfect for use in this application.

    If you don’t have a proper insert, the hole can be drilled and tapped for the next size larger bolt, which is 5/16 X 18 TPI.