Fuel System - wsm B2420 Workshop Manual

B2420, WSM

(4) Fuel System

CAUTION
• Check the injection pressure and condition after confirming that there is nobody standing in the direction
the fume goes. If the fume from the nozzle directly contacts the human body, cells may be destroyed and
blood poisoning may be caused.
Injection Timing
1. Remove the injection pipes and timing window cover.
2. Set the speed control lever to the maximum fuel discharge
position.
3. Turn the flywheel counterclockwise (facing the flywheel) until
fuel flows from the delivery valve holder.
4. Continue to turn the flywheel slowly, and stop it as soon as the
fuel level at the tip of the delivery valve holder begins to
increase.
5. Check to see if the timing angle lines on the flywheel is aligned
with the alignment mark (2).
6. If the injection timing is out of adjustment, readjust the timing
with the injection pump shims (3).
Injection timing Factory specification
NOTE
• The sealant is applied to both sides of the shim (soft metal
gasket shim). The liquid gasket is not required for
assembling.
• Shims are available
(0.000689 in.), 0.20 mm (0.0079 in.), 0.25 mm (0.0098 in.),
0.30 mm (0.012 in.) and 0.35 mm (0.014 in.). Combine these
shims for adjustments.
• Addition or reduction of shim (0.05 mm, 0.002 in.) delays or
advances the injection timing by approx. 0.009 rad (0.5 °).
• In disassembling and replacing the injection pump, be sure
to use the same number of new shims with the same
thickness.
• Refer to figure to check the thickness of the shims.
(Reference)
• The alignment mark (2) of the injection timing line (1) is not in
alignment with the center of the timing window.
• The above mark (2) comes aligned with the center of the clutch
housing rib.
(1) Timing Line
(2) Alignment Mark
(3) Injection Pump Shim
(Soft Metal Gasket Shim)
(4) Shim with three Holes: 0.35 mm
(0.014 in.)
1-S15
9Y1210436ENS0011US0
0.2793 to 0.3141 rad
(16.00 to 18.00 °) before
T.D.C.
in thickness of 0.0175
(5) Shim with two Holes:
0.0175 mm and 0.20 mm
(0.000689 in. and 0.0079 in.)
(6) Shim with one Hole: 0.25 mm
(0.0098 in.)
(7) Shim without Hole: 0.30 mm
(0.012 in.)
9Y1210436ENS0012US0
KiSC issued 06, 2012 A
ENGINE
mm