6.9 block heater?

Discussion in '6.9L IH & 7.3L IDI Diesels' started by adam g, Oct 5, 2009.

  1. adam g

    adam g Full Access Member

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    Where is a safe place to put a block heater on a 6.9? I heard that freeze plug style htrs can crack the block. Any recommendations?
     
  2. Knuckledragger

    Knuckledragger blowing chunks

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    The stock ones are in the freeze plug hole, can't do much better than that. And no, they don't crack the block. That is what happens if you do not use coolant or a heater and let the truck freeze overnight.
     
  3. jhnlennon

    jhnlennon Full Access Member

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    83-early 85 engines had issues with the block cracking around the block heater. Well documented. Alot of people run a circulating tank type heater, there might be a lower radiator hose heater available to.
     
  4. Diesel JD

    Diesel JD Full Access Member

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    jhnlenon has the correct answer. Somewhere on here there probably is the info on the serial # breaking point where IH fixed this casting defect. It's probably safe to say if the engine was built in late 1985 or later you can just use the stocker. Mine is an 86 and has a Dec 85 build date. I use the block heater with no issues
     
  5. dyoung14

    dyoung14 Is getting worn out

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    Yes if its a 83 84 and some 85 blocks un plug the block heater and throw the plug away cause it can cause your block to crack, the later blocks didnt have the prblem
     
  6. dyoung14

    dyoung14 Is getting worn out

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    posted at the same timeLOL
     
  7. adam g

    adam g Full Access Member

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    It was in an early 84 truck and I plan on using a lower hose heater. Thanks guys.
     

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