TP-6323 3/06 29Section 3 Scheduled Maintenance
3.7 Cooling System
3.7.1 Closed Heat Exchanger
In a closed cooling system, the seawater circulates
through separate chambers within the heat exchanger
to cool the engine water. The seawater then mixes with
engine exhaust and ejects out the exhaust outlet. See
Figure 3-5 for coolant capacity (include coolant
recovery tank capacity of 0.47 L (16 oz.). See
Figure 3-6 for thermostat and pressure cap ratings.
Model L (Qts.)
All models 7.6 (8.0)
Figure 3-5 Coolant Capacity
Model
10/13/15EG
and
13/15EGZ
Pressure Cap Rating 96.5kPa(14psi)
Thermostat Rating
71_C (160_F)
Figure 3-6 Pressure Cap and Thermostat Rating
3.7.2 Checking and Filling Coolant
Hot coolant and steam.
Can cause severe injury or death.
Before removing the pressure cap,
stop the generator set and allow it to
cool. Then loosen the pressure cap
to relieve pressure.
WARNING
Checking the coolant level. Hot coolant can cause severe
injury or death. Allow the engine to cool. Release pressure
from the cooling system before removing the pressure cap. To
release pressure, cover the pressure cap with a thick cloth and
then slowly turn the cap counterclockwise to the first stop.
Remove the cap after pressure has been completely released
and the engine has cooled. Check the coolant level at the tank
if the generator set has a coolant recovery tank.
NOTICE
Saltwater damage. Saltwater quickly deteriorates metals.
Wipe up saltwater on and around the generator set and
remove salt deposits from metal surfaces.
Maintain the coolant level in coolant recovery tank at
approximately 1/4 full. Before filling the cooling system,
close all petcocks and tighten all hose clamps. Use a
solution of 50% ethylene glycol and 50% clean,
softened water to inhibit rust/corrosion and prevent
freezing. Add additional coolant, as necessary, to the
coolant recovery tank. Periodically check the coolant
level on closed systems by removing the pressure cap.
Do not rely solely on level in coolant recovery tank. Add
fresh coolant until the level is just below the overflow
tube opening.
Note: A coolant solution of 50% ethylene glycol
provides freezing protection to --37°C(--34°F)
and overheating protection to 129°C (265°F). 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 engine
or component damage. Do not use alcohol or
methanol antifreeze or mix them with the
specified coolant. Consult the engine
manufacturer’s operation manual for engine
coolant specifications.
Note: Do not add coolant to a hot engine. Adding
coolant to a hot engine can cause the cylinder
block or cylinder head to crack. Wait until engine
has cooled.
Note: Pay special attention to the coolant level. After
the coolant drains, allow time for complete refill of
the engine water jacket. Check the coolant level
as described earlier.
3.7.3 Flushing and Cleaning
For optimum protection, drain, flush, and refill the
cooling system at the interval listed in the service
schedule.
Flushing and Cleaning Procedure
1. Open the pressure cap and open petcocks located
at the heat exchanger and engine block, and let the
system drain completely. Some models may have
petcocks located behind the belt guard. Remove
the pressure cap to simplify draining.
2. Drain, clean, and flush the coolant recovery tank.
3. Flush the system with clean water.
4. Close the petcock(s).
5. Fill the system with the recommended coolant.
6. Replace the pressure cap.
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