Blocks, cracks and heat
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Northstar Engines and System Technical Discussion Discussion, Blocks, cracks and heat in Cadillac Engine Technical Discussion; I've got a question for the big brains here. Seems that a fair number of high mileage blocks crack after ...
  1. #1
    89falcon is offline Cadillac Owners Fanatic
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    Blocks, cracks and heat

    I've got a question for the big brains here.

    Seems that a fair number of high mileage blocks crack after the have been timeserted, inserted or studded....and in a lot of cases these blocks, by the very nature of headgasket failure, have gotten "hot" on a couple of occasions.

    Do the blocks lose some strength from overheating? Since Aluminum is prone to fatigue cracks....much more than steel or cast iron, is it possible to heat a "good" used block up to a reasonable temp and cool it the "right way" (whatever the "right way" is...) so that it get's strength back?

    I'm not a "mech eng" so help me out here!

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    Ranger's Avatar
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    Re: Blocks, cracks and heat

    The cracked blocks I have heard of were cracked before they where inserted or studded. I have never heard of heating a block to get strength back. I don't think it looses any in the first place.

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    ThumperPup's Avatar
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    Re: Blocks, cracks and heat

    Mine was cracked or damaged sometime between the first HG Job and just took a few months to be noticeable or it cracked after
    how it would crack after i have no idea
    eithere that or
    the Tech didn't inspect it fully and it was bad before so 3 potability for me on it

    i would really hate to think that it was already damaged and the tech just overlooked it that would really be bad

  5. #4
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    Re: Blocks, cracks and heat

    I heard that those cracks are usually caused by uneven torque applied to each head bolts due to some of the failed bolts not holding as it should, but I never encountered a cracked block nor failed bolts so don't know from experience.

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    Ranger's Avatar
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    Re: Blocks, cracks and heat

    I know Joe at Midwest Cadillac Repair has found several before he started working on them. I think he inspects them now before tear down.

  7. #6
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    Re: Blocks, cracks and heat

    Quote Originally Posted by Ranger View Post
    I know Joe at Midwest Cadillac Repair has found several before he started working on them. I think he inspects them now before tear down.
    i hope he inspected mine it be a real sad story if he didn't
    but i don;t know i just know cant cry over spilled milt and its been over a year
    i just know im still upset about the crack and dont get how the heck it could crack after the HG issue but its possible

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    Re: Blocks, cracks and heat

    Yours was done BEFORE he started finding the cracked blocks. He most likely never knew it was cracked.

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    Re: Blocks, cracks and heat

    yeah that is what i keep telling myself
    just wish that they knew about the cracks before mine was done that way at least they could have looked for them
    another thing is i thought he was going to be inspecting the block and everything to make sure they where good before putting it back together

    i know he had the entire half case apart and all cause he broke the bolts on the Oil pan and had to take it apart to get to those so not sure it would have been much harder to double check the block but oh well
    spilt milk is spilt milk

  10. #9
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    Re: Blocks, cracks and heat

    I believe from what I see, most cracks are stress related and found around mounting areas & not temp related.

  11. #10
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    Re: Blocks, cracks and heat

    My crack is behind the front exhaust manifold.

  12. #11
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    Re: Blocks, cracks and heat

    My Crack was all the way across the Front Bank Head bolts i guess you could say

    the crack ran along the block from 2-4-6-8

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