Checking and adjusting start of fuel delivery Checking start of delivery Fig. 1 For the purpose of checking the start-of-delivery setting, an “OT” (= TDC) mark and a scale (2) from 10 ... 50 _ before TDC are engraved on a disc fitted in front of the torsional vibration damper. The scale marks are read against a pointer (1) fitted to the crankcase. 1 Fig. 2 To turn the engine over manually during the setting work, a plate with a central hexagon bolt is located on the front side of the crankshaft pulley. 2 Figs. 3 and 4 There is another scale engraved on the flywheel which can be read through an inspection hole in the flywheel housing but access may be difficult.
The scale should be used for readjusting the pointer after the vibration damper has been re- moved or replaced. Before the vibration damper with the scale disc is installed, the engine should be positioned at “OT” (= TDC) by means of the scale on the flywheel. The pointer should then be aligned such that its measuring edge exactly coincides with the “OT” mark on the scale disc. 3 4 25 2 1