MAST AS. 3C8738 - Caterpillar

Illustration 1 g01155880
(1) Cylinder head
(2) Water temperature regulator housing
(3) Expansion tank
(4) Bypass hose
(5) Radiator
(6) Cylinder block
(7) Engine oil cooler
(8) Transmission oil cooler (if equipped)
(9) Water pump Water pump (9) is located on the right side of the cylinder block. The water pump is gear-driven from the front gear group. Coolant can enter the water pump in two places:
Inlet at the bottom of the water pump
Bypass hose (4) at the top of the water pumpCoolant from the bottom of the radiator (5) is pulled into the bottom inlet of the water pump (9) by impeller rotation. The coolant exits the back of the pump directly into engine oil cooler (7). Some of the coolant is also diverted to transmission oil cooler (8) (if equipped).Some of the coolant passes through the core of engine oil cooler (7) and some of the coolant passes through the core of transmission oil cooler (8) (if equipped). The coolant then enters the internal water manifold of the cylinder block. The manifold disperses the coolant to water jackets around the cylinder walls.From the cylinder block, the coolant flows into passages in the cylinder heads. The passages send the flow around the unit injector sleeves and the inlet and the exhaust passages. The coolant now enters water temperature regulator housing (2) at the