Cooling System; Closed Heat Exchanger; Checking And Filling Coolant; Flushing And Cleaning - Kohler 6EOD Operation

3.9 Cooling System

3.9.1

Closed Heat Exchanger

In a closed cooling system, the seawater circulates
through separate chambers within the heat exchanger or
manifold to cool the engine coolant. The seawater then
mixes with the engine exhaust and ejects out of the
exhaust outlet. See Figure 3-8 for coolant capacities
(include coolant recovery tank capacity of 0.24 L (8 oz.).
Model
6EOD and 4.5EFOD
8EOZD and 6.5EFOZD
9EOZD and 7EFOZD
10EOZD and 9EFOZD
13/14/15.5EOZD and 11/11.5/13EFOZD
20/23/24EOZD and 17/17.5/20EFOZD
28/32EOZD and 23/27EFOZD
Figure 3-8 Engine Coolant Capacities
3.9.2

Checking and Filling Coolant

WARNING
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.
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.
36 Section 3 Scheduled Maintenance
Maintain the coolant level in the 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 solution, 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 until the level is
just below the overflow tube opening.
L (Qts.)
Note: A coolant solution of 50% ethylene glycol is
2.0 (2.1)
required. This mix provides freezing protection to
--37°C (--34°F) and overheating protection to
3.9 (4.1)
129°C (265°F). A coolant solution with less than
2.5 (2.6)
50% ethylene glycol may not provide adequate
2.5 (2.6)
freezing and overheating protection. A coolant
4.4 (4.6)
solution with more than 50% ethylene glycol can
cause engine or component damage. Do not use
6.0 (6.3)
alcohol or methanol antifreeze or mix them with
7.6 (8.0)
the specified coolant.
manufacturer's operation manual for engine
coolant specifications.
Note: Do not add coolant to an overheated engine.
Adding coolant to a hot engine can cause the
cylinder block or cylinder head to crack. Wait until
the engine has cooled.
Note: Pay special attention to the coolant level. After
the coolant drains, allow time when refilling the
coolant for a complete refill of the engine water
jacket. Check the coolant level as prescribed in
the Prestart Checklist.
3.9.3
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, engine block, and cooling
system, and let the system drain completely. Some
models may have petcocks located behind the belt
guard.
draining.
2. Drain, clean, and flush the coolant recovery tank.

Flushing and Cleaning

Remove the pressure cap to simplify
Consult the engine
TP-6252 2/08