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Just replaced the impellor on my 78 Merc 50 hp seriel no 9206843 and it now pumps water fine BUT as I was taking the lower case off a rubber seal dropped from somewhere onto the floor. On inspection it was exactly the same seal as the top seal that fits on the drive shaft of which there are 2...
I decided to replace the water impellor on my blue band 50hp mercury outboard but after starting the engine up using a flushing device to provide the water to test it then after a few seconds black sludge mixed with the water started coming out of the centre of the prop so I stopped it...
