BMW 5 Series Owners & Service Manuals

BMW 5 Series: Split cooling

A new development for the B58TU engine is the split cooling. A cooling concept which is used the N63 TU2.

The split cooling function uses the electric split cooling valve, eSCV, to enable on-demand decoupling of the crankcase from the coolant flow both in the warm-up phase and in partial load operation. In this situation, the coolant is exclusively routed through the cylinder head. The engine reaches its operating temperature more quickly in the warm-up phase, and can be operated with reduced emissions in partial load operation.

Split cooling
Cooling circuit, B58TU engine

  1. High cooling requirement, split cooling cylinder head
  2. Low cooling requirement, split cooling crankcase
  1. Cylinder head
  2. Crankcase
  3. Heat management module
  4. Electric Split Cooling Valve (eSCV)
  5. Coolant pump

Split cooling
Cooling system for B58TU engine

  1. Coolant radiator
  2. Coolant temperature sensor, radiator outlet
  3. Electric fan
  4. Electric split cooling valve
  5. Coolant pump
  6. Pressure relief valve
  7. Coolant temperature sensor, crankcase
  8. Crankcase
  9. Cylinder head
  10. Exhaust turbocharger
  11. Heating
  12. Component temperature sensor
  13. Expansion tank
  14. Engine oil/coolant heat exchanger
  15. Transmission oil/coolant heat exchanger
  16. Heat management module

In split cooling, the cooling requirements for the crankcase and the cylinder head are managed by the electric split cooling valve. The fact that the engine reaches operating temperature more quickly again translates to substantial consumption and emission reductions.

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    The following graphic shows the positions of the rotary valve as the coolant temperature increases. Circuit diagram of heat management module in B58TU engine 0 % - Rotary valve closed 100% - R

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