Cummins ISX11.9 CM2250 – Service Manual 200-003   Flow Diagram, Cooling System

Flow Diagram

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ISX11.9 CM2250

1. Coolant inlet flow from radiator
2. Coolant inlet connection
3. Coolant from inlet to water pump
4. Coolant from water pump to coolant filter
5. Coolant filter
6. Coolant from coolant filter to water pump
7. Coolant from water pump to cylinder block inlet
8. Coolant from water pump to exhaust gas recirculation (EGR) cooler
9. EGR cooler
10. Coolant from EGR cooler to lubricating oil cooler
11. Lubricating oil cooler
12. Coolant from rocker lever housing
13. Thermostat closed
14. Coolant through bypass tube to coolant connection
15. Thermostat open
16. Coolant to radiator
17. Selective Catalyst Reduction (SCR) system coolant supply.

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ISX11.9 CM2250

1. Coolant inlet from radiator
2. Coolant inlet to water pump
3. Coolant from water pump to cylinder block
4. Coolant to lubricating oil cooler
5. Lubricating oil cooler
6. Coolant flow around cylinder liners
7. Coolant to lower cylinder head
8. Coolant to upper cylinder head
9. Coolant to rocker lever housing
10. Coolant from cylinder head to OEM coolant manifold
11. OEM coolant manifold supply
12. OEM coolant manifold and Selective Catalyst Reduction (SCR) system coolant return.

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ISX11.9 CM2250

1. Coolant from cylinder block to air compressor
2. Air compressor
3. Coolant from air compressor to rocker lever housing.

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ISX11.9 CM2250

1. Coolant from lubricating oil cooler to turbocharger bearing housing
2. Turbocharger bearing housing
3. Coolant from turbocharger bearing housing to rocker lever housing
4. Coolant from turbocharger bearing housing to turbocharger actuator
5. Turbocharger actuator
6. Coolant from cylinder block to aftertreatment fuel injector
7. Aftertreatment fuel injector
8. Coolant from aftertreatment fuel injector to turbocharger actuator outlet
9. Coolant from turbocharger actuator outlet to EGR mass measurement flow assembly
10. EGR mass measurement flow assembly
11. Coolant from EGR mass measurement flow assembly to rocker lever housing.