TP-6774 2/14a28 Section 5 Cooling System
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
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.
5.2 Water-Cooled Exhaust
Manifold
Each marine generator set has a water-cooled exhaust
manifold. The coolant solution circulates through the
manifold, reducing the amount of heat radiated from the
exhaust into the surrounding area.
The engine thermostat is located in the water-cooled
exhaust manifold. See Figure 5-2. See Section 1 for the
water-cooled exhaust manifold torque spec.
1. Thermostat assembly
2. Thermostat (located inside thermostat housing)
1
2
Figure 5-2 Thermostat Location
5.3 Coolant Replacement Inc luding
Heat Exchanger Service
At the interval specified in the Service Schedule, clean
the heat exchanger tube. In a closed cooling system,
seawater circulates through separate chambers within
the heat exchanger to cool the engine coolant. The
seawater then mixes with engine exhaust and ejects out
of the exhaust mixer’s outlet. See Section 1 for coolant
capacity, thermostat, and pressure cap ratings.
1. Open the heat exchanger outlet to drain the
coolant. See Figure 5-3.
Figure 5-3 Heat Exchanger Outlet
2. Close the heat exchanger outlet.
3. Remove the engine plug to drain the engine
coolant. See Figure 5-4.
Figure 5-4 Engine Drain Plug
4. Replace the engine plug.
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