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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
8 for proper cooling ranges. The cooling system does require
certain preventative maintenance to keep it in optimum operat-
ing 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 inter or 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 lev-
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el 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
DANGER
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
WARNING
Do not remove pressure cap when engine is hot. Coolant is
under pressure and may be forced out causing personal injury. After
engine is cooled, remove cap slowly to allow pressure to escape.
CAUTION
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.
4.3/5.3/6.2L 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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