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[BIGDRY]

Ok so i found a lovely easter egg left by PO - a snapped exhaust manifold bolt in the head... 
Has anyone successfully managed to put in a timesert or heli coil into cast iron head of one of these cj engines in situ? - I've been quoted £80 by specialist mobile thread guy...might be money well spent if its a nightmare or is it relatively simple process? (i currently have the front wings and manifolds off so access is good) thx

[wildwood]

I'd go with the £80 guy.....

Easi outs are not, as their name suggests and are worse if they snap cos they are harder than a hard thing.....

Other ways are spark erosion but need kit for that..... And as it's easy access for the man I would stand back and let him sweat on this occasion.

[bgbazz]

 .....sometimes it's prudent to stand and watch. 

[Dave69]

helicoils are ok but not robust, damage the coil and forget putting a bolt in.

timsert = strong threaded bolt hole, thread stripped just remove tim sert and insert another, best fix for a spark plug

£80 to fix pay the money and leave the hassle to someone else

[eastryjeep]

You do have the manifolds off already I assume? Either way dont be surprised if that has to happen.
With manifolds out of the way you might be able to weld a suitable scrap bolt to the sheared off stud and work it out with penetrating oil and care.
If you go for a Helicoil/Recoil, make sure you are not going to get galvanic corrosion by only using a coated and passivated insert. Tubular inserts are usually superior but size and location would determine possibility of use.

[BIGDRY]

ok called specialist and watched him do exactly what i would have done  - still at least its done and i would of had to buy the tools anyway.  (i think the secret is a really good quality tap and ratchet drill tbh).

The rebuild can continue now! cheers all.

[bgbazz]

 

[Dave69]

good result, but if he broke the tap then it would have been fun to watch him remove it

[BIGDRY]

tbh id done 90% of the hard work drilling most of it out, and his tap seemed to cut into the head like butter - very sharp, looked good quality,expensive.
I think most of the technique is not to be scared and get it right first time by just getting into it positively.

[welling4x4]

I would defo go with the £80.let him have the stress.not only that it will then be warranted.

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