Checking and setting 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 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 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 Fig. 3 The graduated scale on the flywheel, which is visi- ble through the inspection hole in the flywheel hou- sing, is often difficult to access.
However it must be used to readjust the indicator after the vibration damper has been removed or replaced. For this purpose, before the vibration damper with scale disc is installed, the engine must be set to “TDC” using the flywheel marking. The pointer must then be aligned so that its mea- suring edge points exactly to the “TDC” mark on the scale disc. 3 Fig. 4 To avoid read−off errors, always look over the notch on the flywheel housing vertically to the cen- tre of the flywheel. The marking on the graduated scale must be on the imaginary ”notch − flywheel centre” line. 4 24