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10. Engine Maintenance
Closed Cooling System
The closed cooling system is designed to provide
extended life to your new Marine Power Engine. Your
engine will operate at a different temperature range
from a raw water cooled engine. Please refer to the
appropriate Engine Identification on Page 15 for
proper cooling ranges. The cooling system does
require certain preventative maintenance to keep it in
optimum operating conditions.
Heat Exchanger: All closed cooled engines
incorporate a shell and tube heat exchanger. This unit
exchanges heat between the sea water and the engine
coolant. These units require very little maintenance.
A routine inspection of the interior tube sheets during
winterization is sufficient. Be sure to remove any debris
found during this inspection.
Zinc Anode: Your heat exchanger is equipped with a
zinc anode that is approximately 2” long. If your engine
is operated and maintained in saltwater this anode
should be inspected for deterioration after the first
10 hours of operation. Inspect again after 50 hours of
operation and every 50 hours thereafter.
Recovery Bottle: The plastic recovery bottle is
attached to the heat exchanger tank (on most models)
and fills with coolant during operation when the internal
water temperature is higher. If necessary, add coolant
only when engine is cold.
Surge Tank: Some models are equipped with a surge
tank rather than a recovery bottle. The surge tank
replaces the heat exchanger filler neck and pressure
cap and is pressure capable whereas the recovery
bottle is not. Maintain the appropriate level in the
surge tank at all times. If coolant is consistently low,
additional inspection for leaks in the cooling system
may be required.
Filler Neck and Pressure Cap: DO NOT remove
pressure cap when engine is HOT. If coolant is low, add
the proper mixture (50% water/50% antifreeze) to the
top of the filler neck located on the heat exchanger tank.
If coolant is consistently low, additional inspection for
leaks in the cooling system may be required.
Filling Closed Cooling System
IMPORTANT! The closed cooling system must
remain filled year-round with the proper mixture of 50%
antifreeze/50% water to assure protection of system
during the lowest exposed temperatures. Insure that
all drain plugs are installed and tightened. Fill heat
exchanger (tank) with 50/50 antifreeze/water mixture.
After initial fill, start engine and continue filling heat
exchanger. Engine must be purged of air by bleeding
system. Engines may be bled in a variety of ways;
however, the following bleed points are suggested.
4.3/5.7L Front Mount Full System: Heat exchanger
cap is sufficient.
5.7L Front Mount Half System: Air bleed is located on
top of the heat exchanger on the starboard side.
6.2L LS3/6.2L LSA Vertical Mount Half System:
Heat exchanger cap is sufficient.
6.0/6.2L Horizontal Heat Exchanger Full Systems:
These engines maybe difficult to purge without a
vacuum assembly. If such an assembly is not available,
operator should continue to leave surge tank cap off
and force coolant into bottle until thermostat is open
and all air purged. Once thermostat is open and engine
temperature is stable, reinstall surge tank cap.
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