Self-Study Programme 248 The W Engine Concept - VolksPage.Net

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44 Engine mechanicals The coolant flow flows from the coolant duct to the crankcase and into the two cylinder heads. In the process, two thirds of the volumetric flow is guided to the outside and one third to the inside of the cylinder head in question. This principle helps to provide even cooling, and is known as cross-cooling. Coolant flows into the cylinder heads S248_115 Coolant flows through the cylinder heads from the exhaust side to the intake side. This results in very good temperature equalisation as well as effective cooling of the outlet webs and spark plugs. S248_114
Coolant pump with pump gear S248_112 S248_179 Electrical thermostatic valve for mapped cooling S248_110 S248_111 In both W engines, the coolant pump is located in the cylinder block at the face end. It is mounted directly upstream of the central coolant duct and is driven by the ribbed V-belt. Switching over is affected by an electrically actuated thermostat valve. In the W8 and W12 engine, this valve is installed in the crankcase upper section from above. To replace this valve, it is necessary to remove the intake manifold. By electrically activating the thermostat valve, it is possible to control the switching point and coolant temperature. Characteristic maps are stored in the engine control unit. They make it possible for the engine to reach the desired temperature in accordance with the engine's operating requirements. Heating resistor Wax thermo-couple Lifting pin For detailed information, please refer to SSP 222. 45
Page 1 and 2: Service. Self-Study Programme 248 T
Page 3 and 4: At a glance Introduction . . . . .
Page 5 and 6: The W principle To illustrate the p
Page 7 and 8: The modular design principle of the
Page 9 and 10: Comparing the 12-cylinder crankshaf
Page 11 and 12: S248_018 Engine code BDN Dimensions
Page 13 and 14: S248_020 [Nm] 800 700 600 500 400 3
Page 15 and 16: The engine in detail To familiarise
Page 17 and 18: The crankcase lower section The cra
Page 19 and 20: Conrods and pistons S248_016 Trapez
Page 21 and 22: There is a groove at the gear wheel
Page 23 and 24: Two-mass flywheel S248_061 A spring
Page 25 and 26: The 4 valves in each cylinder are a
Page 27 and 28: The secondary air ducting system Be
Page 29 and 30: The camshaft timing control Like th
Page 31 and 32: Retard adjustment The solenoid valv
Page 33 and 34: In the W12 engine, the hydraulic be
Page 35 and 36: Schematic diagram of the oil circui
Page 37 and 38: The oil circuit based on the dry-su
Page 39 and 40: The oil pump is mounted from below
Page 41 and 42: Lubrication of the conrod bearings
Page 43: Coolant circuit of W12 engine Right
Page 47 and 48: W12 engine Intake manifold upper se
Page 49 and 50: W12 engine Diaphragm valve, right O
Page 51 and 52: Tailpipes Rear silencer Exhaust sys
Page 53 and 54: Liquid gaskets Application of the l
Page 55 and 56: Place the copper coloured chain lin
Page 57 and 58: Notes 57
Page 59 and 60: 5. Why does the W8 engine have a ba
Page 61 and 62: 13. Which of the following statemen
Page 63 and 64: 14.) a 13.) a 12.) b 11.) a, c 10.)

Self-Study Programme 248 The W Engine Concept - VolksPage.Net

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