2. Inspection and Adjustment
33
[Informative: Fuel injection valve structure]
2) Spray pattern inspection
After adjustment to the specified valve opening
pressure, use a nozzle tester and check the spray
pattern and seat oil-tightness.
a) Seat oil tightness check
• After injecting a few times, increase the pressure
gradually. Hold the pressure for about 5 seconds
at a little before the valve opening pressure of
1.96 MPa (20kgf/cm
2
), and check to see that oil
does not drip from the tip end of the nozzle.
• If extreme oil leak from the overflow joint exists
during injection by the nozzle tester, check after
retightening. If much oil is leaking, replace the
nozzle assembly.
Nozzle holder
Pressure adjusting shim
Nozzle spring
Nozzle spring seat
F.O. return pipe joint
Valve stop spacer
Nozzle valve
Pin
Nozzle
Nozzle body
Nozzle case nut
Tightening torque:
39.2 to 44.1 N m (4 to 4.5 kgf m)
Normal
(Uniform spray pattern from each nozzle)
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