I have
@hawkeye405 to Thank for bringing up this problem ...and calling my attention to the fact that I was actually MISSING the One, Indispensable Sub-Component in my otherwise complete GM Kent-Moore TIME-SERT Dealership Repair Kit:
The "STI" (Screw Thread Insert) TAP @ M6 X 1.0 in Dimensions, Kent-Moore Part# KMJ42385-203. I did some poking around and discovered that this TAP can be ordered ( and I did so...) as a Separate Item and is presently available from
autotoolworld.com. So now ... I have that Sub-Set completed and available for my Future Repairs:
If the Complete $50.00 K&M Tool Kit for the M6 X 1.0 X 12 MM TIME-SERT Thread Repair is unavailable.... THIS Over-Sized M6 X 1.0 TAP is probably the MOST Critical Sub-Tool to have on hand. It has also been difficult to find the Special Sized Drill required to Drill Out the Old Remaining M6 X 1.0 X 15MM Stripped Out Thread Lines, as the OD of this Tool will have to be an OVER-SIZED ...with Metric Measurement of around 6.13 MM.
There MAY be an SAE Equivalent Sized Drill Bit that can SLIGHTLY enlarge the (6) Coil On Plug Fastener Holes in the Engine Head... and yet, still leave enough 'meat' for this Special "STI" TAP to cut in Brand New Threads and allow the M6 X 1.0 X 12 MM TIME-SERT Insert to easily Thread inside.
I like using WD-40 to Lubricate Hard Steel Bits when cutting Threads into any Aluminum Substrate. Turn the TAP Slowly at a Right Angle to the Engine Head. Clean the Drill Hole Frequently using "canned air" to flush out and catch the "sprue" into a Scott's "BLUE" Shop Towel held over the Work Area and prevent all of that Drilling Junk from getting all over and inside of the Open Engine Head.
You would still require some kind of "Router" Square Face Bit with an OD slight;y Larger than the OD of the TIME-SERT Insert Rim and having an ID of around 6.13 MM. This would allow for creating a Counter-Sunk area at the Top of the M6 X 1.0 X 15MM Bolt Holes sufficiently deep to allow the Rim of the TIME-SERT Insert to STOP its downward travel.
Next ...for the purposes of using a "Non-K&M Kit" Tool Substitute, selecting an
ARP M6 X 1.0 X 40MM 10.9 Hardness Black Steel Bolt could act as the means of Holding the TIME-SERT Insert after lubricating the
ARP Bolt Threads with Cutting Oil...and threading on the New TIME-SERT Threaded Cylinder to the
ARP Bolt as far down as it will go.
Last in this sequence ...after Daubing on some
Red Thread Locker...The
ARP Bolt could be used to Thread the Insert into the Engine Head as far down as it will go...and use a Box End Wrench to Pass the
ARP Bolt all the way through the Last Few Internal Threads of the Insert... Cold Forming them and Locking the Insert Permanently into place.
You're Done!
For anyone else curious about the
TIME-SERT Thread Repair System... This is the BEST Video available for explaining the Subject: