Birty Dastards Jeep Club

Tech Forum => Workshop => Topic started by: BIGDRY on March 14, 2016, 02:03:18 PM

Title: timesert/helicoil in 4.2 head
Post by: BIGDRY on March 14, 2016, 02:03:18 PM

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

Title: Re: timesert/helicoil in 4.2 head
Post by: wildwood on March 14, 2016, 03:43:11 PM

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.

Title: Re: timesert/helicoil in 4.2 head
Post by: bgbazz on March 14, 2016, 06:54:07 PM

 :iagree:.....sometimes it's prudent to stand and watch.  :greggmo:

Title: Re: timesert/helicoil in 4.2 head
Post by: Dave69 on March 15, 2016, 12:21:44 AM

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

Title: Re: timesert/helicoil in 4.2 head
Post by: eastryjeep on March 15, 2016, 01:08:20 AM

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.

Title: Re: timesert/helicoil in 4.2 head
Post by: BIGDRY on March 17, 2016, 02:01:36 PM

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.

Title: Re: timesert/helicoil in 4.2 head
Post by: bgbazz on March 17, 2016, 03:13:51 PM

 :icon_super:

Title: Re: timesert/helicoil in 4.2 head
Post by: Dave69 on March 17, 2016, 06:59:17 PM

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

Title: Re: timesert/helicoil in 4.2 head
Post by: BIGDRY on March 18, 2016, 02:08:00 PM

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.

Title: Re: timesert/helicoil in 4.2 head
Post by: welling4x4 on April 18, 2016, 12:27:39 AM

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

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