4-8 SHB 803 en – Edition 2.4 * 803s410.fm
Engine
4.7 Injection time
Checking and adjusting injection time
• Preparatory work:
☞Mark the actual position of the fuel injection pump on the engine block.
☞Trace the mark with a touch-up applicator.
☞Set the throttle to work position.
☞Unscrew only the injection line on the pump side and bend it a little to the side so that
you can see the opening to the fuel injection pump.
☞In order to be able to see better, you can use a section of an injection line or a transpar-
ent tube instead of the injection line (as required)
• Measurement:
☞Slowly turn the engine clockwise, as seen from the radiator side.
☞As you do so, carefully watch the opening where the injection line was.
☞Stop turning as soon as fuel starts coming out.
☞Wipe away the fuel and turn back to about 20° before top dead center.
☞Repeat the measurement.
☞Read the mark on the crankshaft (15°).
Injection time is set correctly if it corresponds to this value.
☞If it does not correspond to this value, loosen the fuel injection pump (do not unscrew it
completely) and rotate it a little.
➥Rotated toward the engine: earlier injection time
➥Rotated away from the engine: later injection time
☞Screw the fuel injection pump firmly and check.
☞Repeat the procedure as required.
Bend the injection lines as you install them so they are not subject to tension once
they are installed. Bleed the injection lines once they are installed.
Fig. 6: Measuring equipment
Fig. 8: Opening on fuel pump
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