COVER (LOWER) 4K6734 - Caterpillar

Introduction (Cooling System)
The engine has a basic cooling System. The cooling system has the following components:
Radiator
Water pump
Oil cooler
Water temperature regulator (thermostat)Coolant Flow
Illustration 1 g00896204
Coolant flow (1) Radiator (2) Water pump (3) Cylinder block (4) Engine oil cooler (5) Cylinder head (6) Water temperature regulator (thermostat) and housing (7) Bypass for the water temperature regulator (thermostat)The coolant flows from the bottom of the radiator to the centrifugal water pump. The water pump is installed on the front of the timing case. The water pump is driven by a gear. The gear of the fuel injection pump drives the water pump gear. The water pump forces the coolant through a passage in the timing case to the front of the cylinder block. The coolant divides as the coolant enters the cylinder block. Most of the coolant flows along the right hand side of the cylinder block. The coolant then flows around the outside of the cylinders to the rear of the cylinder block.The remainder of the coolant flows along a passage in the left side of the cylinder block to the oil cooler. The coolant flows around the element of the oil cooler to the rear of the cylinder block. The coolant then flows to the rear of the cylinder head.The coolant flows forward through the cylinder head. The coolant then flows into the housing of the water temperature regulator. If the thermostat is closed, the coolant goes directly through a bypass to the inlet side of the water pump. If the thermostat is open, the bypass is closed and the coolant flows to the top of the radiator.