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Thread: Slipped piston liner/cracked block causes?

  1. #1
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    Slipped piston liner/cracked block causes?

    im in the middle of pulling out the engine in my 1999 Disco 2 V8, its giving alot of signs of a slipped liner/cracked block,

    im giong to stip the motor down and decide to either re-sleeve the block or buy a brand new one, depending on the amount of damage in there

    in the research i have done i have heard of a couple of different causes, and perminant fixes, with the most common sence cause being the type of head bolts used from factory, apparently they used torque to yeild bolts, which were way to tight/strong for the block, causing the crack, and to overcome this problem in the repair is to go back to the old style head bolts

    has anyone else heard of this? any other causes/fixes to this problem?

  2. #2
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    I thought a slipped liner was most often caused by overheating, the fix I believe is to get them pinned or a top hat liner? whatever that is.
    I really don't know whats involved with either but there has been a few threads on liners so a search for those subjects should you you a fair bit of into.
    GL

  3. #3
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    "How long since you've visited The Good Oil?"

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  4. #4
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    thanks pedro, was just reading that, and it seems to be a very common sence cause, and with that in mind, the smart option is to re-sleeve my block rather than sourcing a brand new one, but the being said, my engine has had the heads off 2 times in the last 3 years, lets hope that if the headbolts are the cause, that the damage isnt too severe

  5. #5
    Discobaker Guest
    Good luck pauly85, hope all goes well, I too considered the option you've chosen but no one I spoke to was willing to even give it a try & if they were, quotes were between 10K & about 13K. I went with the second hand replacement, backed by 12 mnths parts & labour warranty with a reputable company $5500 later & some blood sweat & tears today changing over a throttle body and fixing the horn buttons she purrs.
    Hope yours is nice & straight forward.
    Cheers
    Mat

  6. #6
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    thanks discobaker, im am lucky in the sence that i work as a panel beater, and i know alot of people in the automotive industry, and a good friend of one of my good friends is willing to re-sleave my block for a very cheap price as a cash job, but that price is only assuming that my block only needs the sleeves replaced, and not anything else like bearings etc, so keep your fingers crossed!! otherwise its a brand new block and the car will be on the market straight after the new block!!

  7. #7
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    Studs over bolts, any bolts. There's one issue that you have to remove the rearmost studs to remove the heads as the heads won't clear the studs before hitting the firewall. But apart from that, twice the price but reusable and reliable.

    As for re-sleeving at "a cheap price" a built top hatted short block should set you back around $3500- and that's a 4.6 when I was looking around last christmas. A block re-sleeved with std style sleeves is just waiting for the same issue to occur.

  8. #8
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    yeah it would be stupid to re sleeve the block using standard sleeves, so top hat sleeves will be used

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