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stripped thread on cylinder head

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billdn:
Following my earlier post on fitting rocker box and subsequent advice all went well..until..on tightening bolts down I noticed 1 nearest cam chain to rear wasn't tightening on cylinder head, yup the thread is stripped. I guess fit helicoil repair. And I suppose i need to remove cylinder head to do it. One step forward three back. Unless of course you sages know better!

Trigger:

--- Quote from: billdn on August 13, 2017, 04:40:44 PM ---Following my earlier post on fitting rocker box and subsequent advice all went well..until..on tightening bolts down I noticed 1 nearest cam chain to rear wasn't tightening on cylinder head, yup the thread is stripped. I guess fit helicoil repair. And I suppose i need to remove cylinder head to do it. One step forward three back. Unless of course you sages know better!

--- End quote ---

What thread has striped ? If it is just a 6mm, then cover the top of the head in clingfilm, make a small hole were you need to do the helicoil and put a bit of tissue covered in Vaseline so the swarf sticks to it. Hoover out the thread hole once tapped and insert the coil.

kevski:

--- Quote from: Trigger on August 13, 2017, 05:22:23 PM ---
--- Quote from: billdn on August 13, 2017, 04:40:44 PM ---Following my earlier post on fitting rocker box and subsequent advice all went well..until..on tightening bolts down I noticed 1 nearest cam chain to rear wasn't tightening on cylinder head, yup the thread is stripped. I guess fit helicoil repair. And I suppose i need to remove cylinder head to do it. One step forward three back. Unless of course you sages know better!

--- End quote ---

What thread has striped ? If it is just a 6mm, then cover the top of the head in clingfilm, make a small hole were you need to do the helicoil and put a bit of tissue covered in Vaseline so the swarf sticks to it. Hoover out the thread hole once tapped and insert the coil.

--- End quote ---

Pretty much the same as trigger says except use time-sert's far better though more expensive.

Trigger:
Insert's for through holes, helicoils for blind holes in my book  ;) Beware: There are some shite inserts and helicoils about.

billdn:
Yes it's 6mm. One of middle four on the head that has 2 either side of the cam chain. It's the rear right , from front of engine. I've only got a bog standard hand drill, will I get hole straight enough with that? I suppose original hole will act as guide. 

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