Indmar Marine Engines
7-9
Fresh Water Cooled Engines
1. Check the level of
the coolant in the
coolant recovery
tank. The coolant
level with a cold
engine should be
approximately 1/3
of the coolant tank
capacity. (Figure
7.7) Use an anti-
freeze tester suit-
able for measuring
the strength of
propylene glycol
anti freeze to test
the strength of the
mixture.
2. If the coolant level is low, use a mixture of propylene
glycol antifreeze and distilled water to bring the level
in the recovery tank to the appropriate level. If the
strength of the mixture needs to be increased, we rec-
ommend that you drain and refill the system with the
appropriate strength mixture of antifreeze and distilled
water.
3. Remove the drain plugs from the ends of the heat
exchanger and drain the raw water from the exchang-
er. One of the drain plugs in the heat exchanger is a
sacrificial anode. The
active material on a new
anode is approximately
1-1/2 inches long. If the
anode is 3/4" (19 mm) or
less, it must be replaced
with a new P/N S865055
anode. (Figure 7.11)
4. Remove the hoses from
the raw water pump one at
a time and push them low
into the bilge to make sure
that any water drains from
the hoses or any coolers that are connected to them.
Make sure the hoses go back to the fittings from
which they were disconnected.
5. Coat the threads of the heat exchanger drain plug
and anode with pipe sealant and install.
6. Disconnect the hose that runs between the two
exhaust manifolds. Lower the hose into the bilge
using care not to kink it. Allow both exhaust manifolds
to drain.
NOTICE
Never use pipe thread tape or sealant on sacrificial
anodes as they must maintain electrical contact with
the housing.
HOT
COLD
INDM-B002
1
Figure 7.10 – Overflow Tank
SACRIFICIAL ANODE
REPLACE IF ANODE IS
3/4" (19 mm) IN LENGTH
INDM-B007a
Figure 7.11 – Sacrificial
Anode
OME0502-15 Body.qxp_OM0502-05 Body.qxd 5/20/14 12:45 PM Page 7-9
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