Fuel System - Kubota WSM STV32 Workshop Manual

STV32 · STV36 · STV40, WSM

(4) Fuel System

Injection Timing
1. Remove the stop solenoid.
2. Remove the injection pipes and nozzle.
3. Remove the cap of the timing window (1) on the housing under
the right step.
4. Set the speed control lever to maximum fuel discharge
position.
5. Turn the flywheel counterclockwise (facing the flywheel) until
the fuel fills up to the hole of the delivery valve holder (2) for
1st cylinder.
6. Turn the flywheel further and stop turning when the fuel begins
to flow over, to get the present injection timing.
7. (The flywheel has mark 1TC and four lines indicating every
0.087 rad (5 ) of crank angle from 0.175 rad (10 ) to 0.436
rad (25 ) before mark 1TC) Calculate the angle which the
center of the window points out.
8. If the calculation differs from specified injection timing,
change, add or remove the shim (6) to adjust.
Injection timing Factory spec.
A The sealant is applied to both sides of the soft metal
gasket shim. The liquid gasket is not required for
assembling.
A Shims are available in thickness of 0.20 mm (0.0079 in.),
0.25 mm (0.0098 in.) and 0.30 mm (0.0118 in.). Combine
these shims for adjustments.
A Injection timing delays or advances by approx. 0.0087 rad
(0.5 deg), when the thickness of the shim increased or
decreased by 0.05 mm (0.002 in.).
A In disassembling and replacing, be sure to use the same
number of new shims with the same thickness.
(1) Timing Window
(2) Delivery Valve Holder
(3) Two-holes:
0.20 mm (0.0079 in.)
1-S17
ENGINE
0.297 to 0.331 rad (17 to
19 ) before T.D.C.
(4) One-hole:
0.25 mm (0.0098 in.)
(5) Without hole:
0.30 mm (0.0118 in.)
(6) Soft Metal Gasket Shim
0000007476E
KiSC issued 04, 2006 A