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

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40 Engine mechanicals The lubrication system The oil in the oil circuit has a lubricating and cooling function. The W engines are filled with type 0W30 3.5 engine oil. The piston spray jets The oil is guided from the central oil duct of the crankcase upper section to small nozzles on the underside of the cylinder bores. Here, the oil is sprayed below the pistons in order to lubricate the piston contact faces and piston pins as well as to cool the pistons. The crankshaft bearing lubrication system The oil is ducted through bore holes from the central oil passage to the crankshaft. Then it is pumped via a groove on the back of the bearing cups to the upper bearing cup. There it reaches the crankshaft through five bores in the upper bearing cup. Crankshaft Upper bearing cup Groove on the back of the bearing cups Oil supply Bearing support S248_093 S248_092
Lubrication of the conrod bearings Transitional pockets Inflow to main bearing Bore from main bearing to conrod bearing Groove in crankcase Inner groove of bearing cup (in upper bearing only) Inflow to conrod bearing S248_177 S248_175 The oil flows from the outer circumferential groove into the inner groove of the upper bearing cup through five bores. The bore ensures that an even oil film forms. Integrated pockets at the transition to the lower bearing cup ensure a steady supply of oil to the conrod bearings via bores in the crankshaft. 41
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: The oil pump is mounted from below
Page 43 and 44: Coolant circuit of W12 engine Right
Page 45 and 46: Coolant pump with pump gear S248_11
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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