TOHATSU BFT250A Service Manual page 78

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MAINTENANCE
STERN BRACKET
Check the anode [1] for excessive wear or corrosion.
Replace the anode with a new one if it is corroded
excessively (page 19-6).
Check the continuity between the anode [1] and stern
bracket or power trim/tilt.
Remove the corrosion as it prevents continuity.
Perform continuity inspection between the anode metal
surface without corrosion and the bare aluminum
surface of the stern bracket or the power trim/tilt.
If there is no continuity, remove the anode metal (page
19-6) and remove the corrosion from the bolt, anode
metal, and anode metal installation surface.
Install the anode metal and recheck the continuity.
If there is no continuity, replace the anode metal with a
new one and recheck.
ANODE METAL INSPECTION (INNER
SIDE)
CYLINDER SLEEVE WATER JACKET
Remove the cylinder sleeve water jacket anode (page
11-15).
Check the anode [1] for excessive wear or corrosion.
If the anode is worn to less than 2/3 of its original length
or the sealing bolt is rusty or damaged, replace the
anode assembly as a set.
If the sealing bolt is rusty or damaged, replace the
screw, anode metal and sealing bolt with new one as a
set.
Check the continuity between the anode [1] and sealing
bolt [2] surface.
Remove the corrosion and sealing tape as it prevents
continuity. Use a soft resin brush or shop towel to clean
the surface. Using a wire brush or sandpaper will
damage the coating of the sealing bolt, resulting in
corrosion.
If there is continuity, reinstall the anode (page 11-15). If
there is no continuity, replace the anode assembly as a
set.
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