M11 Series – Service Manual – 200-003   Flow Diagram, Cooling System

Flow Diagram

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Coolant System – STC Engines

1. Water pump coolant inlet
2. Coolant to lower manifold cavity
3. Coolant to cylinder liner block cavity
4. Coolant to cylinder head
5. Coolant to upper manifold cavity
6. Lower manifold coolant to oil cooler
7. Oil cooler to upper manifold cavity.

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Oil Cooler and Aftercooler Coolant – STC Engines

1. Coolant entry to lower manifold cavity
2. Lower manifold coolants to oil cooler and aftercooler
3. Aftercooler coolant outlet to upper manifold cavity
4. Oil cooler water outlet to upper manifold.

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Coolant System – CELECT™ Plus Engines

1. Water pump coolant inlet
2. Coolant to lower manifold cavity
3. Coolant to cylinder liner block cavity
4. Coolant to cylinder head
5. Coolant to upper manifold cavity
6. Lower manifold coolant to oil cooler.

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Thermostat – STC and CELECT™ Plus Engines

Open Thermostat — Items 1 to 5

Closed Thermostat — Items 6 to 9

1. Water pump coolant inlet
2. Upper manifold cavity (coolant to thermostat)
3. Coolant outlet
4. Lower manifold cavity to cooler
5. Cooler to upper manifold cavity (before thermostat).
6. Upper manifold cavity (coolant to thermostat)
7. Coolant bypass (return to water pump)
8. Lower manifold cavity to cooler
9. Cooler to upper manifold cavity (before thermostat).