ENGINE
B2420, WSM
1-S17
Nozzle Spraying Condition
• 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 injects the human body,
cells may be destroyed and blood poisoning may be
caused.
1. Set the injection nozzle to a nozzle tester, and check the nozzle
spraying condition.
2. If the spraying condition is defective, replace the nozzle piece.
9Y1210436ENS0015US0
Fuel Injection Pressure
1. Set the injection nozzle to a nozzle tester (Code No.
07909-31361).
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.
(Reference)
• Pressure variation with 0.01 mm (0.0004 in.) difference of
adjusting washer thickness. Approx. 235 kPa (2.41 kgf/cm
2
,
34.1 psi).
9Y1210436ENS0016US0
Valve Seat Tightness
1. Set the injection nozzle to a nozzle tester (Code No.
07909-31361).
2. Raise the fuel pressure, and keep at 12.75 MPa (130.0 kgf/cm
2
,
1849 psi) for 10 seconds.
3. If any fuel leak is found, replace the nozzle piece.
9Y1210436ENS0017US0
(a) Good (b) Bad
Fuel injection pressure Factory specification
13.73 to 14.70 MPa
140.0 to 150.0 kgf/cm
2
1992 to 2133 psi
(1) Adjusting Washer
Valve seat tightness Factory specification
No fuel leak at
12.75 MPa
130.0 kgf/cm
2
1849 psi
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