Technical > Matt Shaff's Engine Shop

Bad main bolt Heli-coil

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LZ:

--- Quote from: dreracecar on November 11, 2015, 07:43:10 AM ---Heli coils are fine for carburator studs,  Time certs are the best and not that expensive if you look at the big picture.  Repaired a Alu block at the rear trans mount flange with a time cert and lasted for 12 years, finally it gave up and pulled, No problem, they have a kit that repairs previously repaired threads, something a heli-coil cant do. So if the hole has to be redone, an oversize time cert maybe your only option because of the size hole that had to be drilled for the heli-coil.

--- End quote ---

H coils also work great on Spacecraft and air frames.   ;)

Banjo40:
Many thanks for all the replies guys, I appreciate it. Looks like the time serts may be the best option for my repair.

Mike

FEDNV:
I have a very old set of aluminum heads and started to pull rocker studs out right and left and was fixing with helicoils then those pulled out.  Had my machinist put timeserts in every hole and have not had one issue since.  I am sold on them.

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