TDC RS110030 Locking the engine in the TDC position • Remove front cover. • Turn the belt pulley to move the piston to TDC on the ignition stroke. Top dead centre on ignition stroke: 1. TDC mark is visible, and 2. The inlet and exhaust valves in the cylinder in question are closed. 11 2 650 • Prevent the clutch housing from moving with locking device, BMW No. 11 5 640 . TDC RS110461 L Note: The engine can be correctly positioned at TDC with locating pin, BMW No. 11 2 650 , through the hole in the clutch housing and the engine block. 11.20 11 5 6 40 11 5 6 40