Headgasket fail

Discussion in 'Diesel Tech' started by MikeMeyer, Mar 24, 2020.


  1. MikeMeyer

    MikeMeyer Farmall Cub

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    Hello All!

    my 80 sd33t only has about 2-3k miles on the shortblock, and there was compression leaking out the side of the headgasket at speeds/loads greater than 45mph. I took the head off to investigate and definitely found a narrow channel where combustion gases were leaking out the side of the gasket from around one of the small coolant holes (jug 2), but i dont see any real damage around the piston sealing rings - except that around cylinders 2,3,4,5 all have a fair bit of carbon/soot around/between all those cylinders especially moreso on the drivers side of the block - see pics and let me know if you think this was just improper torqueing or lack of re-torqueing or what you think the possibility is. I pretty much purchased this truck this way, ive only put about 20 miles on it total since i got it a couple years ago.

    thanks for your help!
     

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  2. cartwright

    cartwright High Wheeler

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    There are a few possibilities.
    Improper torquing.
    Too much liner protrusion.
    Warped head.
     
  3. MikeMeyer

    MikeMeyer Farmall Cub

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    Hello! ive checked a lot of items since this was posted - head is warped less than spec, so thats good. I did check liner protrusion and its on the shallow side but definitely above the min spec and consistent across all cylinders - i was only able to check this with plastigage and my straight edge since i did not have feeler gauges shallow enough, and my dial hole depth gauge only increments in .001 - short block is a jesco unit with very few miles on it, and the cylinders look nearly new.
     

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