Checking and adjusting start of fuel delivery Checking start of delivery Fig. 1 2 For the purpose of checking the start-of-delivery setting, an “OT” (= TDC) mark and a scale 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 fitted to the crankcase. 1 3 А Pointer Б “OT” (= TDC) mark and scale В Hexagon driver to rotate engine by hand (Width across flats 32) 1 Fig. 2 The graduated scale on the flywheel, visible through an inspection hole in the flywheel housing, is often difficult to access. However, it is needed for adjusting the pointer after removal and/or ex- change of the vibration damper.
For this reason, turn engine to TDC by means of the flywheel marking before fitting the vibration damper with the graduated scale. 2 Fig. 3 To avoid incorrect readings, always look past the notch on the flywheel housing and straight towards the flywheel centre. The marking on the graduated scale must be on the imaginary “notch − flywheel centre” line. 3 Fig. 4 The pointer should then be aligned such that its measuring edge exactly coincides with the “OT” mark on the scale disc. 4 27