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TP-5695 12/933-12 Scheduled Maintenance
Cooling Systems—
Closed/Heat Exchanger
In a closed cooling system, the seawater does not
circulate through the engine but circulates through
separate chambers within the heat exchanger to cool
the engine coolant. The seawater is then mixed with
engine exhaust and ejected out the exhaust outlet. The
coolant is circulated through cooling passages to cool
the engine. All models make use of a coolant thermostat
and a coolant recovery tank. The coolant capacity of the
engine with heat exchanger is 0.72 U.S. qts. (0.68 L) for
all models. A solution of 50% ethylene glycol and 50%
clean, softened water is recommended to inhibit
rust/corrosion. A coolant solution of 50% ethylene glycol
will provide freezing protection to --34°F (--37°C) and
overheating protection to 265°F (129°C). A coolant
solution with less than 50% ethylene glycol may not
provide adequate freezing and overheating protection.
A coolant solution with more than 50% ethylene glycol
can cause damage to engine and components. Do not
use alcohol or methanol antifreeze or mix them with the
coolant.
Filling and Checking
WARNING
Hot coolant and steam.
Can cause severe injury or death.
Before removing pressure cap stop generator,
allow to cool and loosen pressure cap to relieve
pressure.
Hot coolant can cause severe injury or death. Allow
engine to cool and release pressure from cooling
system before opening pressure cap. To release
pressure, cover the pressure cap with a thick cloth then
turn it slowly counterclockwise to the first stop. After
pressure has been completely released and the engine
has cooled, remove cap. If generator set is equipped
with a coolant recovery tank, check coolant level at tank.
NOTE
ENGINE DAMAGE! Failure to bleed air from cooling
system may cause overheating and subsequent
damage to engine.
NOTE
Special attention should be given when checking for
proper coolant level. After the coolant has been drained,
it normally requires some time before complete refill of
the engine water jacket takes place.
Before filling the cooling system, verify that all hose
clamps are tight. Loosen air-bleed screw located on top
of the engine to allow trapped air to escape. See
Figure 3-14. Place a rag around the screw to prevent
coolant spillage onto the block. Remove pressure cap
located on the top of the engine (see Figure 3-15) and fill
with the recommended coolant until level is just below
overflow tube opening. Tighten air-bleed screw when
coolant, free of air bubbles, starts to flow. Replace
pressure cap. Start generator set and allow to run for
about 20--30 seconds. STOP generator set and recheck
coolant level by removing pressure cap. Repeat
procedure, as necessary, until coolant can no longer be
added.
A coolant overflow bottle is provided. Fill bottle to just
below the MAX mark. See Figure 3-16. Maintain proper
coolant level in coolant overflow bottle. The MIN mark
indicates full when cold and the MAX mark indicates full
when hot. Coolant level should always be between
these marks. The coolant level can be checked using
the overflow bottle markings, but it is recommended to
periodically remove the coolant pressure cap and check
coolant level.