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I recently found an old 240z that’s been abandoned for quite some time. Not sure how long though. I want to check if the engine is seized but I don’t know how to. I can’t try to start it because the ignition is missing and there are keys and there isn’t a battery. Anyone know how to check for a seized engine. Thanks
 

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Put a 1/2" drive breakover bar and appropriate sized socket on the harmonic balancer bolt and try to turn the motor. Turn clockwise so you do not loosen the bolt.
 

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If you can first remove the sparkplugs just in case some water found its way into the cylinders. It will also make turning the engine easier.
 

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If you can first remove the sparkplugs just in case some water found its way into the cylinders. It will also make turning the engine easier.
I'd also recommend spraying a penetrating lubricant like PB Blaster or WD 40 in the cylinders and let it set overnight before trying to turn the crank.
 

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All the above are good ideas. But WD-40 in its normal formulation is not penetrating oil. They do make a penetrating oil product, but it's specifically labeled as such.
 

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I recently found an old 240z that’s been abandoned for quite some time. Not sure how long though. I want to check if the engine is seized but I don’t know how to. I can’t try to start it because the ignition is missing and there are keys and there isn’t a battery. Anyone know how to check for a seized engine. Thanks
Turn the cooling fan
 

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As a personal preference thing, working the crank directly at the pulley bolt has some advantages in focused force and a better feel for what the engine will or won't do.

I would further suggest that if it isn't frozen to the plate, having someone dis-engage the clutch will take other possible issues in the driveline out of the equation and make this process easier, while confining feedback to the engine only.
 
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