Tips to help unsieze diesel engine in a NPR

Discussion in 'Mechanic and Repair' started by KrayzKajun, Dec 31, 2012.

  1. KrayzKajun

    KrayzKajun LawnSite Fanatic
    Posts: 10,742

    Anyone of yall engine gurus know any tips/tricks to help unsieze a diesel motor in a 94' isuzu NPR. A buddy who is a heavy equipment mechanic, said to mix a 5gal bucket of diesel/motor oil/ mystery marvel oil, and pour it into the top the engine and let it sit for a few days, drain and repeat.
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  2. Patriot Services

    Patriot Services LawnSite Fanatic
    Posts: 12,536

    Depends on what seized it. If it was just from sitting, maybe. If it was overheated or ran out of oil chances are dim. Marvel oil has freed some pretty bad cases in my time. Usually though they became oil burners after that. Pulling injectors is the only way to get the MM into the chambers though. Good luck but don't be disappointed. Try to bar it over instead of using the starter. That can snap it off and cause more grief.
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  3. larryinalabama

    larryinalabama LawnSite Fanatic
    Posts: 16,476

    I guess if you take off the oil pan and unbolt the rods you might get the motor to turn enough to unbolt the torque converter. Otherwise you may be able to pull the motor with the torque converter attached.

    If its a Katrina victum the electronics will also be locked up.

    It may also be as simple as correded battery cables.
     
  4. jsslawncare

    jsslawncare LawnSite Bronze Member
    Posts: 1,674

    Depend's on why it's locked up. Pouring something into the motor will not do anything for something damaged by heat or no oil. I use to do a lot on machine work on these engine's, it seems like they were bad about spinning rod bearing.
     
  5. jc1

    jc1 LawnSite Bronze Member
    Posts: 1,574

    Is it hydrostatic lock from a cylinder full of fuel from a bad injector? Can you rotate the crank shaft in any direction?
     
  6. KrayzKajun

    KrayzKajun LawnSite Fanatic
    Posts: 10,742

    I havent had a chance to even mess with the motor yet. I will drop the oil pan and pull the head cover ths weekend when i move the truck.
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