ssp305 The 2.5 l R5 TDI engine

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8 Engine mechanics Cylinder head The aluminium cylinder head has been developed as a crossflow cylinder head. This means that the intake port and exhaust ports are arranged opposite each other in the cylinder head. This ensures an efficient charge cycle, and therefore improved cylinder charging. All control elements, such as the valves, tappets and rocker levers, have been adopted from other pump injector engines. Pump injector Glow plug Cable routing Exhaust port Fuel rail Inlet port 305_021 305_020 Electrical plug connector for pump injectors
Pump injectors The second generation pump injectors used previously in the 1.9 l TDI engine are installed in the 2.5 l R5 TDI engine. They have been adapted in respect to jet position and flow. They have the following notable features: – a low-friction drive – an elevated injection pressure in the part-throttle range – a compact solenoid valve To keep drive friction to a minimum, the adjusting screw has a rounded end and the pressure pin has a ball socket. The large radii ensure a low surface pressure. In addition, the engine oil collects in the ball socket and thus provides good lubrication between the adjusting screw and the pressure pin. Adjusting screw Ball socket Pressure pin Solenoid valve 305_029 Balancer piston Inlet bore Injector spring The injection pressure in the part-throttle range has been increased by using a balancer piston with a longer stroke. The pressure in the injector spring chamber rises due to the long stroke of the balancer piston and the flow-restricting action of the inlet bore between the injector spring chamber and the fuel duct. The injector spring is preloaded still further and the injection pressure increases. High pressure chamber 305_030 Fuel return line Fuel supply line 9
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: Warp anchor principle To avoid stre
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 and 24: Overview of the exhaust system The
Page 25 and 26: How the switchable exhaust gas reci
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

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