Posts: 215
Threads: 94
Joined: Oct 2018
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Home Port: ludington michigan
Vessel Info: 2003 4200 open qsm 11 660hp
i am in fresh water, how often do you guys changes your anodes (magnesium)...the ones on the transom and on the trim tabs , thank you
Posts: 702
Threads: 14
Joined: Dec 2010
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Home Port: Kings Park, NY
Vessel Info: 2003 38' Open Cummin's 6CTA's (450 hp)
Not sure if this helps but I stay in SALT water 2 years between short hauls... I use 2 zinc's on each shaft, replace the zinc's on the raw water strainers/generator strainer, the trim tab zinc's and the 2 on the transom every 2 years when the boat comes out.. The shaft zinc's, strainer zincs and trim tab zincs are 90% gone but the transom zincs are ~60% gone.. I replace all during the short haul. Not sure how long your magnesium ones would last.. Just purchased all for my boat as it's coming out for a short haul early May......
Posts: 37
Threads: 14
Joined: Oct 2020
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Home Port: Whitehall Michigan
Vessel Info: 3100 Open Crusader 454s
I replace the propeller shaft and rudder magnesium anodes, annually. By chance, does anyone know the propeller shaft diameter of a 31' open, 454 powered?
Posts: 702
Threads: 14
Joined: Dec 2010
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Home Port: Kings Park, NY
Vessel Info: 2003 38' Open Cummin's 6CTA's (450 hp)
Not sure which year 31 Open you have but I had a 1997 31 Open w/Crusader 454's and the shafts were 1 1/2"....
Posts: 37
Threads: 14
Joined: Oct 2020
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Home Port: Whitehall Michigan
Vessel Info: 3100 Open Crusader 454s
Sorry, it's a 1986.
Thanks,
magnesium anodes
