I had to adjust the packing gland on one shaft this year. I didn't like using pipe wrenches so I made some wrenches the right size. I think this will make the job a little easier. These are 2 & 7/16 And 2 & 17/32.
They are just mild steel, but should be strong enough for the job.
Roger
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Sea Jay
1983 37 double cabin, twin 230hp Volvo diesels, twin disk 1.5-1 20X 23 4 blade props