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The threads that the valve cover bolt screws into is stripped. Does anyone know of a repair without removing the head?
 

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yes there is a way to do it. called a Helli coil. most auto parts stores carry the right size. just take your bolt with you to the store . yes it is metric. there should be some instrions in the package , should have a tap , setting tool . drill bit. ido belive. good luck .
 

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Village Whack Job...
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If I recall correctly there isn't a lot of material around those holes. By the time you drill one out big enough to be tapped for a heli coil... there might not be anything left. Might be better to just drill and tap the hole the next size up and get a bigger bolt
 

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Junior Grue
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I've found "Loctite ® Form-A-Thread" works well in situations where there is not enough material for a thread insert or larger bolt.
 

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I'd try re taping it with original size first, can't hurt.
 

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Just before you do this if you haven't already.

Try this.

Put in a longer bolt.

I've done this on a rocker carrier bolt and was about to go down the route of tap and hellicoil then got a tip to try this and low IT WORKED!!.

Cheap and easy to try. The bolts in the head that hold the cover on are not a deep as the holes they go into. You are just using the extra undammaged thread.

As a guide I have driven some 5000 miles on this fix and no problems.
 

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A longer or larger bolt would be hard to find for this application.

I have seen many broken valve cover bolts due to over torquing, but never a striped out hole unless the hole was damaged during the removal of a snapped bolt.

The fact that the valve cover is basicly rubber mounted will allow SOME imperfections in a repair, but the distance from the head to where the bolt goes through the cover will multiply the effects of the hole not being squared.



Bill
 

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Hi Goldtop, the only problem I see with the longer bolt suggestion on the valve covers is that those bolts have a shoulder on them to keep you from tightening them down too far and maybe warping the cover or otherwise damaging it. Would probably be okay in other applications where a shouldered bolt is not required.
 

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point taken.:dumb:

Guess I'm spoilt by having a shop close buy that sells nothing but bolts and engineering fastenings so getting the right one is a breeze for me.

It's something I forget.

Good luck with the fix and please post an outcome for the ideas posted here and some feedback. Its helps others in the same position.

Ta ta for now.

Goldtop
 
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