Operation and maintenance manual

QSB4.5 and QSB6.7 Flow Diagram, Cooling System

Section D - System Diagrams Page D-9

Flow Diagram, Cooling System

Flow Diagram

1 Coolant inlet

2 Pump impeller

3 Coolant flow past lubricating oil cooler

4 Coolant flow past cylinders

5 Coolant flow from cylinder block to cylinder head

6 Coolant flow between cylinders

7 Coolant flow to thermostat housing

8 Thermostat open - bypass passage closed

9 Coolant flow back to radiator

10 Thermostat closed - bypass passage open

11 Coolant bypass in cylinder head

12 Coolant flow to water pump inlet.

NOTE: Some applications use an OEM supplied remote mounted thermostat. Refer to the OEM service manual for

location.

08d00066