7-17
MAINTENANCE
© 2020 Indmar Marine Engines
FRESH WATER COOLING
All fresh water cooling systems must be inspected and maintained
annually, usually during winterization.
Cylindrical Heat Exchanger – Remove the end caps to drain
and inspect the heat exchanger. Clean out any debris. Make sure
you inspect the end caps for contour and cracks and replace the
neoprene gaskets before putting the boat back in service. If you find
rubber bits in the exchanger, check the raw water pump impeller.
Note that if you use a clean-out rod, it should be softer than the
copper tubes, and should not be used to dislodge materials which
are firmly stuck to the tube surface, as this could damage the tubes.
The rod will assist in cleaning out bits of grass, zinc, shells, and
similar materials which are just lodged in the tubes.
Zinc Anodes – The sacrificial zinc anodes in the cylindrical heat
exchangers frequently spall, and there will probably be zinc bits in
the exchanger which should be cleaned out. Inspect the zinc anode
often during use and replace when it is 3/4” (19 mm) or less.
SACRIFICIAL ANODE
REPLACE IF ANODE IS
3/4" (19 mm) OR
LESS IN LENGTH
INDM-B007
Figure 7.8 – Sacrificial Anode
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