Chapter 6 PERIODIC INSPECTION AND MAINTENANCE PROCEDURES
6-13
Cooling System
Checking LLC Concentration
Check the LLC concentration in the coolant by using an optical hydrometer for battery fluid and antifreeze.
Regarding LLC concentration, refer to "Coolant" (4-6).
Inspection and Replacement of Zinc Rods
Zinc rods (zinc electrodes) are installed at various sec-
tions of the sea water passage to prevent corrosion
caused by sea water.
1 Remove each zinc rod and remove deposits (scale)
from the surface.
2 If the zinc rod has worn to half the original size,
replace it with a new zinc rod. If the zinc rod is larger
than half the original size, reinstall it.
Good
Bad
fig.6-22 Zinc rod good/bad
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