How to fit a hull anode

How to fit a hull anode


In this video we explain how to fit the MGDUFF
ZD77 pear shaped zinc hull anode. This is a brand new installation for this vessel,
but if you have one fitted already you can check you have it installed correctly. To fit the anode for the first time, you will
need 2 x M10B studs, 4MM multi stranded copper bonding cable and ARBOKOL 1000 marine grade
sealant. The anode should be placed well below the
waterline. It must be close to the propellor, but must not disturb the flow of water to
the tips. The anode must not be placed where it will
disturb the water flow to the propellor In this position the anode is clear of the
flow of water to the tips of the propellor. Once the position has been assessed, you must
check the inside of the hull to ensure the studs are accessible. Also ensure that the studs can be easily bonded
to the engine and shaft. Once you have marked the anode positions,
drill a the M10 clearance holes. Apply the Arbokol 1000 to the rear side of
the welded square plate washer. Then, push the long section of stud through
the hull and firmly seat the washer against the hull. Remove the nuts and serrated washer, and fit
the backing pad in place. The backing pad provides protection for the hull against the
alkalinity generated by the anode as it works. Ensure the anode is mounted with the bulbous
end forward. This reduces drag in the water. Use the serrated washers supplied. These ensure
good continuity between the anodes core bar and the mounting stud. If you wish, you can cut down the fixing studs
for a flush finish. Bond the fixing studs to the engine or gearbox
using the 4mm bonding wire and crimp with ring terminals. Then, use and Electro Eliminator
to bond the anode to the shaft. This provides a direct low resistance connection and a second
bonding path to the anode. Once the anode is firmly secured and bonded
internally, you must test the continuity of the anode to the propellor. The resistance should no more than 0.2 ohms.
As you can see, our installation is reading 0.05 ohms, which indicates that a very low
resistance has been achieved. For the ZD77 kit and other parts featured
in the video, visit anodeoutlet.co.uk

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