ISBe/ISB Series Engines – 200-003   Flow Diagram, Cooling System

Flow Diagram

Without EGR

SMALL | MEDIUM | LARGE

Automotive and Industrial without EGR

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 (engines
   without EGR
   only)
7. Coolant flow to thermostat housing
8. Coolant bypass passage
9. Coolant flow back to radiator
10. Bypass open
11. Coolant bypass in cylinder head
12. Coolant flow to water pump inlet.

With EGR

SMALL | MEDIUM | LARGE

Automotive Engines with EGR

1. Coolant flow from cylinder block to EGR cooler inlet
2. Coolant flow from EGR cooler returning back to cylinder head
3. Vent plug used for cooling system fill
4. Coolant flow from cylinder block to VGT actuator inlet
5. Coolant flow from VGT actuator to EGR valve inlet
6. M10 vented banjo – vent orifice to surge tank
7. Coolant flow return from EGR valve back to cylinder head
8. Coolant flow from cylinder block to turbocharger bearing housing
9. Coolant flow return from turbocharger bearing housing back to the rear of the cylinder head.