Part 1

WM 1001IN Tightening torques, tightening sequences, assembly overviews for V8 4.8 l DFI naturally aspirated and turbo engine up to October 2008

Technical values


















































Technical values

Overview

Information

- The tightening steps in the tightening sequences relate to tightening screws uniformly, i.e. all affected screws must first be tightened uniformly to the first torque value, then all screws are tightened one stage further, and so on.

- Replace all O- rings following removal.

The torques in the table below generally apply to screws that are not specifically listed =>

The bolt quality is indicated on the screw head at the top as a decimal number, e.g. "8.8" or "12.9".





Aluminium screws





Group 10 up to October 2008





Upper part of crankcase









Lower part of crankcase









Sealant application









Tightening sequence for thrust-bearing screws









Tightening sequence for securing lower part of crankcase to upper part of crankcase (cross bolt connection)





Left bracket for auxiliary units and engine mounting









Right bracket for auxiliary units and engine mounting









Vent line









Oil mist separator for positive crankcase ventilation (M48/51 turbo engine)









Oil mist separator for positive crankcase ventilation (M48/01 naturally aspirated engine)









Positive crankcase ventilation, M48/51 Turbo









Positive crankcase ventilation (PCV), M48/51 Turbo





Group 13 up to October 2008





Crankshaft









Belt drive









Piston, connecting rod









Connecting-rod assembly, bearing shells









Piston classification









Radial shaft seal









Pulleys





Group 15 up to October 2008





Valves (cylinder bank 5 to 8)









Cylinder head 1 to 4









Cylinder head 5 to 8









Tightening sequence for cylinder head