Cracked drivers side head timing chain guide bolt hole - JeepForum.com
 
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post #1 of 7 Old 07-01-2020, 04:20 PM Thread Starter
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Cracked drivers side head timing chain guide bolt hole

Good afternoon all, I have a cracked head at the top timing chain guide bolt hole on the drivers side head. I’m wondering if it would be ok if I just opened it up a bit and put in some jbweld or should I try to drill and tap and small pin in it or just remove the head and have it welded by a machine shop. My concern with the jbweld is I’m not sure how much vibration the jbweld will endure before letting loose and I don’t want It to cause further damage if it comes apart. Thanks for the advice.

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post #2 of 7 Old 07-01-2020, 04:50 PM
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jb wont do much there. to weld that if possible would mean taking it apart and would seem at that point a head would be best replaced.

what engine is it? That is a real odd stress fracture.

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post #3 of 7 Old 07-01-2020, 06:05 PM Thread Starter
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It is the 4.7l non HO. It isn’t a stress fracture really. I was tightening the bolt to 13ftlbs After installing timing chain kit. when I heard the head pop. Knew immediately what happened.

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jb wont do much there. to weld that if possible would mean taking it apart and would seem at that point a head would be best replaced.

what engine is it? That is a real odd stress fracture.
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post #4 of 7 Old 07-01-2020, 07:47 PM
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I hate to say it but it is fubar. I mean if it was a bush fix one might pin it. glue it. limp it out. Lest someone else has a Macgyver for this.

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post #5 of 7 Old 07-01-2020, 10:24 PM
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I do lots of aluminum tig welding and could fix that no problem , I'm sure if you found a good welder they could tig that with the head on the car ,you would have to V out the crack and fill it with tig weld, don't just try to lay some weld on top the crack or it will crack again . then run a chaser through the thread , green loctite the pin back in and you will be fine .
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post #6 of 7 Old 07-02-2020, 09:30 AM Thread Starter
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Quote:
Originally Posted by 222Doc View Post
I hate to say it but it is fubar. I mean if it was a bush fix one might pin it. glue it. limp it out. Lest someone else has a Macgyver for this.

Thank you for your advice
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post #7 of 7 Old 07-02-2020, 09:32 AM Thread Starter
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Quote:
Originally Posted by RAMMJETT View Post
I do lots of aluminum tig welding and could fix that no problem , I'm sure if you found a good welder they could tig that with the head on the car ,you would have to V out the crack and fill it with tig weld, don't just try to lay some weld on top the crack or it will crack again . then run a chaser through the thread , green loctite the pin back in and you will be fine .
Thank you Iím going to try and find a mobile welder with a tig machine that can come weld it on the vehicle. Thanks again for the advise
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