ssp305 The 2.5 l R5 TDI engine

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24 Engine mechanics Exhaust gas recirculation cooler An exhaust gas recirculation cooler is used in several variants in order to lower the combustion temperature, and thus reduce nitrogen oxide emissions and soot formation. Variants: – An exhaust gas recirculation cooler, which continuously cools the exhaust gas, is used in the Transporter 2004 with automatic transmission and in the Touareg with manual gearbox. Exhaust gas recirculation cooler 305_054 – A switchable exhaust gas recirculation cooler, which cools the exhaust gas at a coolant temperature upwards of approximately 50 °C, is used in the Touareg with automatic transmission.
How the switchable exhaust gas recirculation cooler works A switchable exhaust gas recirculation cooler is used, because continuous cooling of the recirculated exhaust gases results in higher hydrocarbon and carbon monoxide emissions. The exhaust gas is ducted either through the cooler or past the cooler to the exhaust gas recirculation valve. Without exhaust gas cooling The exhaust flap remains closed up to a coolant temperature of approximately 50 °C, and the exhaust gas bypasses the cooler. By the coolant temperature sender G62 With exhaust gas cooling The exhaust flap is opened by the exhaust gas recirculation cooler change-over valve at a coolant temperature of approximately 50 °C. The recirculated exhaust gas now flows through the cooler. The cooling capacity depends on the coolant temperature and the exhaust gas recirculation rate. Exhaust gas recirculation cooler change-over valve N345 Engine control unit J623 To the exhaust gas turbocharger From exhaust manifold Exhaust gas recirculation cooler Coolant Vacuum unit not operated Exhaust flap To EGR valve 305_057 Vacuum unit operated 305_058 25
Page 1 and 2: Service. Self-study programme 305 T
Page 3 and 4: Contents Introduction . . . . . . .
Page 5 and 6: Technical data Power/torque graph O
Page 7 and 8: Warp anchor principle To avoid stre
Page 9 and 10: Pump injectors The second generatio
Page 11 and 12: Conrods and pistons Pistons The pis
Page 13 and 14: Ancillary units drive The ancillary
Page 15 and 16: Oil filter module The oil filter mo
Page 17 and 18: Oil circuit return line The oil mai
Page 19 and 20: Coolant pump The coolant pump is de
Page 21 and 22: Fuel return pressure limiting valve
Page 23: Overview of the exhaust system The
Page 27 and 28: You will find a detailed descriptio
Page 29 and 30: F47 F A G70 A A J17 1 2 3 M 4 5 G23
Page 31 and 32: Designation Special tool Clutch cen
Page 33 and 34: 4. Which of the following statement
Page 36: For internal use only © VOLKSWAGEN

ssp305 The 2.5 l R5 TDI engine

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