Jeep 4.0 block cracks.

josh m

Well-Known Member
Joined
Mar 17, 2013
Got my block to the machine shop over the weekend. Machinist called me today and had found two small hairline cracks around a head bolt hole. Has anyone seen this. He said it's pretty common in some of the late model blocks. Thoughts anyone. What sucks is I took it to another shop in Burlington and had it baked cleaned and magnafluxed. Guy in Burlington didn't catch it.
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He said it goes a couple of threads down on one side only. Anyone here with a bit of 4.0 machining experience?


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Ok I think I have a plan to fix. Time sert with head studs. Now does anyone have a 1/2 13 time sert kit I can borrow. Willing to give a deposit equal to the cost of the kit.


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Yea. Got about 600 in this one since the first machine shop screwed up on the magnaflux job.


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GotWood said:
Isn't finding a new block the safe way?
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Yeah, no kidding, I wouldn't go through the trouble of doing something like that when a block is so cheap. Hell, I have a good running 02 TJ motor that has bad bearings (low oil pressure when warm) that I'd sell you for $200, complete longblock. Block is in great shape.

Did you say you have $600 in the 4.0L block?
 
Yea. 400 for complete 4.2 and 4.0. 320 for magnaflux bake and clean then I dropped another 350 to get the supposed good block milled and bored


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I talked to Lucas yesterday he's a good guy blaze. I also bought that renix you had on eBay blaze. I'll try and get up there next week and check it over.


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josh m said:
I talked to Lucas yesterday he's a good guy blaze. I also bought that renix you had on eBay blaze. I'll try and get up there next week and check it over.
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Ah yeah, that's right, forgot you bought that from us. :lol:
 
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