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That sickening feeling we've all had....

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AshimotoK0:

--- Quote from: matthewmosse on June 21, 2016, 11:13:46 AM ---Some heads they all let go, seems to depend on the previous life of the engine, Helicoils are ok as a fix but can wind back out again sometimes - I have been told timesert is a better alternative that adds serations to the insert so it is less likely to wind back out with the bolt. I have yet to try a timesert as I have a fair number of helicoils to use up.

--- End quote ---

I have heard that 'Timeserts' are better too Matt.. Helicoils used to be made near me in Beverley by Armstrong's..my mate Roger used to run the production line there in the late '60's . They also had an in-house  hard chroming line, as they made shock absorbers too.

royhall:
Don't know its technically correct but I usually loctite the helicoil when I'm inserting them. Not had a single one ever come out again since I started doing that. Had a few before though. Never had to actually remove one, so that may be where my loctiting policy will go wrong. :-[

Bryanj:
Timeserts or keenserts but you may have to order the tap for the outside as they used to be 10mm but the odd pitch

PHILIP2908:
Hello again, Happy to report job done. Got a 6mm helecoil kit off ebay and set to drilling holes in my cylinder head. Blimey, that alloy is like butter; swarf flying everywhere....
Had to fix 3 of the 4 threads, wound the helecoils in with a bit of Loctite (as suggested here - thanks) and another nervous moment when torqueing up the cam carrier bolts. But all went fine, so happy days!!
Thanks for all the confidence inspiring advice as this was a job I wasn't looking forward to.
Regards,
Phil d'A

Trigger:
Butter, more like margarine  ;D I don't even drill them, just straight in with the tap. Should of done all of them as I have known these original threads to strip under engine vibration 

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