20
Figure 8 Fuel supply advance angle
adjustment
Figure 9 Adjustment of the valve
clearance
Fuel supply advance angle adjustment:
There are three rectangle slots in the
joint flange of the fuel injection pump,
through which three bolts are used to
fasten the fuel injection pump to the
gear housing. After unscrewing these
bolts, the fuel injection pump can be
rotated around its axis with small
angle in order to adjust properly the
fuel supply advance angle. Crank the
crankshaft to the position at which
the fuel will be delivered to the No. 1
cylinder according to the above method, unscrew these bolts on the flange and all the
joint nuts for the high pressure fuel lines, rotate the pump a certain angle as required
(inner direction which means to increase the fuel supply advance angle, outer direction
which means to decrease the fuel supply advance angle), then fasten the bolts on the
flange. Check and adjust the fuel supply advance angle to prescription, then fasten the
bolts on the flange.
If the bolts is adjusted to the dead position on the rectangle slots in the flange and
the fuel supply advance angle still does not meet the prescription, remove the gear
housing cover plate of the fuel injection pump, unscrew the three bolts used to fasten
the gear of the fuel injection pump, rotate the pump (inner direction which means to
decrease the fuel supply advance angle, outer direction which means to increase the fuel
supply advance angle). At last fasten the bolts. Check and adjust the fuel supply advance
angle to prescription according to the above method, then recheck whether the bolts are
fastened and install the gear housing cover plate. Pay attention to not damaging the
gasket during adjustment in order to avoid the fuel leakage.