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Cracked Block

Discussion in 'Early CJ5 and CJ6 Tech' started by 3b a runnin, Dec 24, 2019.

  1. Dec 24, 2019
    3b a runnin

    3b a runnin Member 2019 Sponsor

    virginia
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    Jan 11, 2015
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    I thought it must be, but now I know for sure. This is the 225 out of my cj6. Other than some JB Weld or similar, is this thing fixable? It got hot on me one time 2-3 yrs ago, and has had a drip ever since. Only add maybe a 1/2 gal of coolant/yr. I really like the oddfire. I would really like to fix it.
    Thanks in advance
    [​IMG]
    [​IMG]
    Almost forgot to add the pics. Duh me. This is a bummer
     
  2. Dec 24, 2019
    73 cj5

    73 cj5 Not ready for the junkyard yet 2020 Sponsor

    Mississippi
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    Lock n stitch.
     
    dane71 and 3b a runnin like this.
  3. Dec 24, 2019
    47v6

    47v6 junk wrecker! 2020 Sponsor

    Washington DC.
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    I have heard stories of guys fixing cracks like that with JB weld and driving it for years.. I would weld it with some high nickel rod after pre heating and post heating.. Or you could just buy mine when I install my 4.3 in the winter/ early spring.
     
    Alan28 and 3b a runnin like this.
  4. Dec 24, 2019
    Twin2

    Twin2 not him 2020 Sponsor 2019 Sponsor

    Virginia Beach, VA
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    my dad fixed his JD model M with JB weld and held for years
     
    3b a runnin likes this.
  5. Dec 24, 2019
    3b a runnin

    3b a runnin Member 2019 Sponsor

    virginia
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    I had to look that up
     
    Rick Whitson likes this.
  6. Dec 24, 2019
    Jw60

    Jw60 Chim chiminey Chim chim cher-ee!

    Sedalia MO.
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    Oct 5, 2018
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    623
    There's an engine masters episode... budget six or similar but they dropped a newly machined ford 300ci inline 6 and broke an ear off the back.
    They went into fixing the broken block and it did well.
    Pre heat and post heat. High nickel rod. Deep V cut and drill the end of the crack out.
     
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  7. Dec 25, 2019
    nickmil

    nickmil In mothballs.

    Happy Valley, OR
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    Sep 23, 2002
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    Pin it or get a new block. If you want to band aid it until you can find a new block you can JB Weld it (epoxy) with proper prep but it is a temporary fix.
     
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  8. Dec 25, 2019
    sterlclan

    sterlclan Member

    exploring the...
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    fwiw my 87 350 warrior threw a chain and broke the case years ago broke to the inside and puked almost all the oil. cleaned and sanded it on the trail as best we could. mixed some jb weld stick epoxy and applied . waited an hour for replacement oil to arrive filled it and have been using it since no leak. still carry some stick epoxy now.
     
    3b a runnin likes this.
  9. Dec 25, 2019
    jeep2003

    jeep2003 Well-Known Member

    Vestal NY
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    what pressure is your cap? if its 13 or 16 try a low pressure cap like an 6-8lb . I would try brazing it. Iv never done that before but seems like the best/ easiest fix for it. Although i think jb weld would do fine especially with a low psi cap
     
  10. Dec 25, 2019
    3b a runnin

    3b a runnin Member 2019 Sponsor

    virginia
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    I have a 7lb cap on this one. I used the electric fan that came with the new aluminum radiator, simply didn't move enough air. I bought a fan that moved twice as much air and had no problem since. I have found an intermediate grill since then, so my plan is to use a mechanical fan this time.
     
  11. Dec 25, 2019
    fhoehle

    fhoehle Sponsor

    Harford Township, PA
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    I agree on a new block if you are running it long term. JB is ok to get by but the way I see it, you will be miles away from anywhere when it really decides to spring a leak.
     
  12. Dec 25, 2019
    Rich M.

    Rich M. Shoe pusher

    Maryland
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    Block. 225's aren't hard to find.
     
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  13. Dec 26, 2019
    Alan28

    Alan28 Well-Known Member 2020 Sponsor 2019 Sponsor

    Ch√Ętillon en...
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    a frien of mine, around 1966, had a nice Peugeot 203, first car. We were student. because we lived in Paris, he parked this car with special agreement in the yard of our high school.
    But winter came, and extreme cold... engine craked, broken. First lesson for car owner.
    There are probably nowadays possibilities of repairing, maybe without removing the engine.
    I would try the easiest solution first, then...
     
  14. Dec 26, 2019
    timgr

    timgr Jeepin' Nerd 2020 Sponsor 2019 Sponsor

    Medford Mass USA
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    I would expect any of these heroic repairs, like lock-n-stitch, would end up more expensive than another core. Conventional wisdom says find another core unless it's a rare part (ie Duesenberg or such). What's the condition of the engine, otherwise? If it's ready for a refresh, I'd look for a better core and start from there.
     
    fhoehle likes this.
  15. Dec 26, 2019
    jeep2003

    jeep2003 Well-Known Member

    Vestal NY
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    machine shops weld up blocks all the time. my block had tons of cracks. but its got to be torn down and at that point you might as well rebuild it right.
     
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  16. Dec 28, 2019
    mullen46cj2a

    mullen46cj2a Member 2020 Sponsor 2019 Sponsor

    Harrisville, WV
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    I have a short block in Harrisville, WV.
    Contact me if you are interested.
     
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  17. Dec 28, 2019
    3b a runnin

    3b a runnin Member 2019 Sponsor

    virginia
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    Bruce, Looks like you're about 4 1/2 hrs from me. I may very well take you up on the short block. I have a set of heads from another dauntless on hand.
    PM coming
    Thanks
     
  18. Dec 29, 2019
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Your cracks look like they are from freezing rather than an overheat. Either way, a good replacement block is the best fix. This can be welded, but would require disassembly and an oven to do it correctly.
    -Donny
     
    timgr likes this.
  19. Jan 12, 2020
    3b a runnin

    3b a runnin Member 2019 Sponsor

    virginia
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    Thanks to Rich M, I got a little tip on a complete engine that may eventually find its way into the blue cj6 because of the cracked block. Thanks Rich M
    Actually the guy had 3 of them and I bought all of them.
    [​IMG]
    I don't know much about condition, except none are stuck
    There are a few goodies in the lot. Flywheel, bellhousing, ignition switch
    [​IMG]
    [​IMG]
    power steering pumps, brackets, HEI dist., rear dump ex manifolds, even a air cond. compressor. I'm pretty sure these 2 are 231 even fire, buts thats ok
    [​IMG]
     
  20. Jan 12, 2020
    3b a runnin

    3b a runnin Member 2019 Sponsor

    virginia
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    I also bought a power steering gear from him from a 95 Wrangler
     

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