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seized 1978 70hp Merc

jclays

Regular Contributor
Good evening
I was given a 1978 70hp outboard by a friend who just wanted it out of his shop. Said it ran fine about 5 years ago. He stored it in his shed without starting it for all that time and it has frozen or seized up from no use. I removed the spark plugs and sprayed PB Power blaster into the cylinders and let sit for a week . I put a socked and breaker bar on the crank nut up top and got the motor to turn until it reached the bottom of the stroke and stopped. More PB blaster waited a few days and tried turning again by hand. It moved a little however I am not sure how much torque I can apply by hand with a breaker bar and socket. I do not want to strip or shear off the stud or whatever that nut is attached to.
Any thoughts or Info???
 
Rmove lower unit -----See what happens.--------You need to remove it anyway to replace impeller if motor turn out to be worthwhile.
 
That flywheel is splined to the shaft (not keyed) so you won't hurt it. The block will probably has to come apart as the walls have be seriously rusted.

Jeff
 
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