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Old 12-31-2012, 08:03 PM
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KrayzKajun KrayzKajun is online now
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Tips to help unsieze diesel engine in a NPR

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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Old 12-31-2012, 08:11 PM
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Patriot Services Patriot Services is online now
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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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Old 12-31-2012, 08:53 PM
larryinalabama larryinalabama is offline
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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.
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Old 12-31-2012, 09:52 PM
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jsslawncare jsslawncare is offline
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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.
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Old 12-31-2012, 09:57 PM
jc1 jc1 is offline
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Is it hydrostatic lock from a cylinder full of fuel from a bad injector? Can you rotate the crank shaft in any direction?
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Old 12-31-2012, 10:04 PM
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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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