COOLING SYSTEM SCHEMATIC

COOLING SYSTEM

SYSTEMS OPERATION

(Industrial Engines)

COOLING SYSTEM

(Marine Engines)

COOLING SYSTEM SCHEMATIC

1. Sea water pump. 2. Expansion tank. 3. Exhaust risers. 4. Shunt line. 5. Heat exchanger. 6. Inside

bypass. 7. Outlet for sea water. 8. Housing for water temperature regulators. 9. Water pump. 10. Water

cooled exhaust manifolds. 11. Orifices between cylinder heads end front cover for the engine. 12. Cylinder

block. 13. Coolant for marine gear oil. 14. Cooler for engine oil.

Water pump (9) is installed on the front face of the

exhaust manifolds the coolant goes to the front cover for

front cover for the engine and is driven by V belts from

the engine.

the crankshaft pulley. As the coolant goes from the water

pump it divides and goes through inside passages in the

From the front cover for the engine the coolant

front cover for the engine to cylinder block (12) and up to

either goes to the inlet for water pump (9) or to expansion

the cylinder heads. From the cylinder heads the coolant

tank (2).

goes forward through orifices (11) to the front cover for

If the coolant is cold (cool) the water temperature

the engine.

regulators (17) will be closed. The coolant will go through

Part of the coolant going to the left side (as seen

inside bypass (6) to water pump (9). If the coolant is

from the flywheel) of cylinder block (12) goes to cooler for

warm the water temperature regulators (17) will be open.

marine gear oil (13) and on to the cooler for engine oil

When the water temperature regulators (17) are open

(14). Both of these oil coolers are in a common housing

they make a restriction in the inside bypass (6) and the

at the top rear of the engine.

coolant goes to the lower part of expansion tank (2).

(Expansion tank (2) is divided into an upper and lower

After the coolant goes through the oil coolers it

compartment by a baffle.) From the lower compartment of

divides and goes to the rear of water cooled exhaust

expansion tank (2) most of the coolant goes through heat

manifolds (10). After going through the water cooled

exchanger (5) and the inlet for water pump (9).