Indmar 5.7L Vortec Operator's Manual page 75

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 Sierra
Brand Anti Freeze 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 Sierra Brand
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
Indmar Marine Engines
Figure 7.7 – Overflow Tank
sacrificial anode. The
active material on a new
anode is approximately 1
1/2 inches long. If more
than 1/2 of the active
material is missing from
the anode, it must be
replaced with a new P/N
S865055 anode. (Figure
7.8)
4. Remove the hoses from
1
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
INDM-B002
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.
Never use pipe thread tape or sealant on sacrificial
anodes as they must maintain electrical contact with
the housing.
SACRIFICIAL ANODE
REPLACE IF ANODE HAS
REDUCED TO 1/2 OF
ORIGINAL SIZE
Figure 7.8 – Sacrificial
Anode
NOTICE
INDM-B007
7-7