Water-line!
by Rares Badrea
in Blog
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"... and, most important, you have to take the propeller off regularly to check if there is any fishing line on the prop-shaft. Because if you do get a fishing line on the prop-shaft it WILL damage the oil seal, the oil will get out and the water will get in. And we all know that water does not lubricate as good as oil. Just joking, water doesn't lubricate AT ALL!"
I say this phrase at the end of every service I do on outboards and stern-drives. But in reality very few do take their prop out between the services to check for fishing lines.
In the pictures below is pure salt water coming out a SEIZED gearbox.
 water
 
The fishing line you see attached on the prop-shaft did a "good" job!
 

fishing line

 A fishing line is good on a rod not on a prop!