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72 Merc 800 lower unit locking up

bbstacker

New member
The power head and the lower unit rotate freely when separated but when I join them up I get one revolution on the fly wheel and the lower unit locks or binds. While installed I can shift the unit with no problems and it functions as the manual describes. Once the lower unit is removed all is well again. I have removed/installed several times now but can't find the problem. The drive shaft is the pre-load type and goes together freely with no binding.
Thanks!
 
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