Component description for exhaust gas recirculation cooler

W14.20-1021-76

Location

Shown on engine 471.9

1 Charge air housing

2 Charge air pipe (mixer housing)

3 Exhaust gas recirculation cooler

Y621 Exhaust gas recirculation positioner

The exhaust gas recirculation cooler (3) is located on the right side of the engine over the exhaust manifold and the turbocharger.

Task

The exhaust gas recirculation cooler (3) cools the branched off exhaust from a temperature of approx. 650 °C to a temperature of approx. 170 °C.

W14.20-1022-76

Design

Shown on engine 471.9 with code (M5Z) Engine version Euro VI

3 Exhaust gas recirculation cooler

4 Exhaust chamber

5 Coolant strip

6 Coolant outlet (feed line to nozzle unit for diesel particulate filter regeneration)

7 Coolant inlet (return line from nozzle unit for diesel particulate filter regeneration)

8 Coolant outlet

9 Exhaust outlet (to charge air pipe)

10 Coolant inlet (from coolant pump)

11 Exhaust inlet (from exhaust manifold)

12 Front end cover

13 Rear end cover

14 Coolant outlet

The exhaust gas recirculation cooler (3) consists of an oblong box-shaped housing, with two disconnected chambers - the exhaust chamber (4) and the coolant strip (5)

Function

The branched off exhaust flows through the exhaust inlet (11) into the exhaust chamber (4) and flows through it and on to the exhaust outlet (9) towards the charge air pipe (2), where it is then fed together with the fresh air or the charged air to the combustion process.

The coolant strip (5) of the exhaust gas recirculation cooler (3) is permanently flowed through with coolant from the coolant circuit of the engine.

The exhaust gas that flows in the exhaust chamber (4) is cooled by the heat transfer.