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

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PHILIP2908:
DK/DS special progress: had the head skimmed to try and solve the massive oil leak I had.
Head now back on and just bolting down the cam carriers...........when........we all know it...........the resistance suddenly disappears. One stripped thread; well 3 actually.
I think this is due to some abuse its had in a previous life.
I was using the figure of 8ft lbs as given in the Haynes manual for 6mm threads.
Q: has anyone got any experience of Helecoils in an alloy head? The screw holes look to be blind and as long as I cover up the oil holes and valve springs I should be OK....
Whaddya think?
All advice welcome.
Thanks in advance.

Trigger:
These de-thread all the time and I helicoil these every day.

UK Pete:
Yes well known for there weakness,  helicoil is cheap and simple, just make sure you cover up well and hoover the swarf up
chin up fella this can be very disheartening especially after all the other shite you have had, you will get there in the end
pete

ginger_jim:
Yup....had to do a couple in mine too.  Then the camchain adjuster bolt threaded too.  I bought a cheap kit although ive lost the special drill bit somewhere along the line :-(  For a 5mm tap is the drill bit something like 4.8mm?

matthewmosse:
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.

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