wsm STW37 Workshop Manual page 98

STW34, STW37, STW40, WSM
CAUTION
• Check the injection pressure and condition after making sure 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.
Nozzle Spraying Condition
1. Set the injection nozzle to a nozzle tester, and check the nozzle
spraying condition.
2. If the spraying condition is damaged, replace the nozzle piece.
(a) Good
Fuel Injection Pressure
1. Set the injection nozzle to a nozzle tester.
2. Slowly move the tester handle to measure the pressure at which
fuel begins jetting out from the nozzle.
3. If the measurement is not within the factory specifications,
replace the adjusting washer (1) in the nozzle holder to adjust it.
Fuel injection pressure Factory specification
(Reference)
• Pressure variation with 0.01 mm (0.0004 in.) difference of
adjusting washer thickness.
Approx. 235 kPa (2.4 kgf/cm
(1) Adjusting Washer
Valve Seat Tightness
1. Set the injection nozzle to a nozzle tester.
2. Raise the fuel pressure, and keep at 12.75 MPa (130 kgf/cm
1849 psi) for 10 seconds.
3. If any fuel leak is found, replace the nozzle piece.
Injection pressure Factory specification
1-S19
9Y1211109ENS0014US0
(b) Bad
9Y1211109ENS0015US0
13.8 to 14.7 MPa
140 to 150 kgf/cm
2000 to 2130 psi
2
, 34 psi)
9Y1211109ENS0016US0
No fuel leak at
12.7 MPa
2
130 kgf/cm
1850 psi
9Y1211109ENS0017US0
KiSC issued 11, 2014 A
ENGINE
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