Kohler 8EFOZ User Manual

TP-6053 7/0420 Section 5 Cooling System
5.2 Water-Cooled Exhaust
Manifold
Each generator set is equipped with a water-cooled
exhaust manifold. Engine coolant circulates through the
manifold, reducing the amount of heat radiated from the
exhaust into the surrounding area. The engine
thermostat is located in the manifold. See Section 1 for
the thermostat location. See Figure 5-2 and Figure 5-3
for exhaust manifold bolt tightening sequence and
torques.
5847316
1
2
3
6
5
4
1
2
3
6
5
4
1
2
3
6
5
4
5EOZ/4EFOZ 8EOZ/6.5EFOZ
9/10EOZ and 8/9EFOZ
Figure 5-2 Water-Cooled Exhaust Manifold Bolt
Tightening Sequence
Model Bolt Torque
5EOZ/4EFOZ 8Nm(6ft.lbs.)
8/9/10EOZ and 6.5/8/9EFOZ 19 Nm (14 ft. lbs.)
Figure 5-3 Exhaust Manifold Bolt Tightening Torques
5.3 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
Section 1.3 for the coolant capacities. Add an additional
0.24 L (8.0 oz.) of coolant to the coolant recovery tank.
5.4 Fill Check and Coolant
Keep the coolant recovery tank 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 and
corrosion and to prevent freezing. Add additional
coolant mixture, 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 the level in the coolant recovery tank. Add
fresh coolant mixture until the level is just below the
overflow tube opening.
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 the engine has cooled.
Note: Coolant solution. A coolant solution of 50%
ethylene glycol provides freezing protection to
-- 3 7 _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.
5.5 Flush and Clean Cooling
System
For optimum protection, drain, flush, and refill the
cooling system at the interval listed in the operation
manual’s service schedule.
Pay special attention to the coolant level. Check the
coolant level as described earlier.
Flush and Clean Procedure
1. Remove the pipe plug located in the heat
exchanger.
2. Open the petcocks on the engine block and cooling
system and let the system drain completely. Some
models may have petcocks located behind the belt
guard.
3. Remove the pressure cap to simplify draining.
4. Drain, clean, and flush the cooling system,
including the coolant recovery tank, with clean
water.
5. Close the petcocks.
6. Fill the cooling system with recommended coolant.

Kohler 8EFOZ Specifications

General

Brand	Kohler
Model	8EFOZ
Category	Marine Equipment
Language	English