Broken Head Bolt


snoranger

4.0L > 2.9L > 3.0L
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Ranger Mark

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Well to anyone interested, I found out why I broke 3 head bolts.

I'll just leave this right here. Hint: check spec section. The giveaway is the thread starting depth.
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For those who didn't want to look it up, my block is early 1999 but my truck is a '96. Instead of a 2 step process, it is a 5 step process. Coming nowhere close to 70 ft. lbs. How the passenger side worked is beyond me.
 

Dirtman

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Well that solves one mystery.
 

Uncle Gump

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Did you manage to get the bolt out?
 

Ranger Mark

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Did you manage to get the bolt out?
I'm working on it today. Had to get some 1/2" tubing and grind to fit for a drill guide. Slow going, but this should help
me drill straight at least
15628920460881940242229.jpg
15628921601211562187735.jpg
 

ericbphoto

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You have the right idea... slow and steady
 

pjtoledo

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Use lots of lube
 

Ranger Mark

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are you using a reverse twist drill bit?


No. The left handed bits aren't strong enough. The bit in the picture above is titanium and barely makes a dent. Got a cobalt bit at Grainger last night and went through the bolt like it was butter.
 

ericbphoto

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No. The left handed bits aren't strong enough. The bit in the picture above is titanium and barely makes a dent. Got a cobalt bit at Grainger last night and went through the bolt like it was butter.
That sounds like progress
 

Ranger Mark

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20190908_130443.jpg
Here's an update.
The hole with the insert was out of round. Some idiot couldn't drill a straight hole. (Looking in the mirror). I just kept adding layers of jb weld until I was able to drill and tap for the helicoil. After using the proper torque procedure, it felt strong and smooth. I added some red thread locker when I installed the insert just as insurance. I'll let you all know what happens when I get it running.
 

Ranger Mark

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Well I'm hoping to drop this in next week. Get to babysit the grandkids this weekend. My wife is getting anxious so I'm skipping some of the details I wanted to do but it will be good enough if it runs well.
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Dirtman

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So friggin big!
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Why... uhhh... did you paint your exhaust manifolds blue?
 


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