California Air Tools 3010 Service Manual Page 81

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FUEL SYSTEM 3-11
Fuel Injection Nozzle
Injection Pressure Check
Install the fuel injection nozzle on a nozzle tester.
Quickly move the tester lever up and down so that the
injection nozzle sprays two to three times.
This step blows off any carbon deposits on the injection
nozzle port.
Move the lever very slowly, gradually raising the pressure.
Measure the maximum pressure just as the pointer of the
pressure gauge drops s uddenly.
Fuel Injection Nozzle Injection Pressure
Marking of Injection Nozzle:
Red or Green: 13 239 14 220 kPa (135 145
kgf/cm², 1 920 2062psi)
None:
14 465 14 955 kPa (147.5 152.5
kgf/cm², 2 098 2169psi)
If the measured pressure does not comply with the spec-
ification, replace the injection nozzle.
Leakage Check
(When there is a mark (green or red) on the nozzle.)
Slowly depress the tester lever, until the pressure reaches
about 11 768 kPa (120 kgf/cm², 1 706 psi.)
(When there is no mark on the nozzle.)
Slowly depress the tester lever, until the pressure reaches
about 12 749 kPa (130 kgf/cm², 1 849 psi.)
Checking for “Buzzing” and Spray Pattern
Operate the tester lever at a rate of 30 to 60 strokes per
minute in the case of a new nozzle; 15 to 60 strokes per
minute in the case of a used nozzle.
Make sure that “buzzing” occurs during these strokes.
NOTE
When this “buzzing” occurs, you can feel a pulsation
transmitted to your hand through the nozzle tester han-
dle while the nozzle injection is taking place.
When the pressurized fuel from the injection pump is in-
jected, this injection is accompanied by rapid, recurring
pressure variations during the time from the start to the
finish of the injection. These pulsing pressure variations
are felt as “buzzing”.
These pulsations of the fuel are affected mainly by the
movement of the nozzle needle and good or bad condi-
tions of the valve seat section.
Generally, a nozzle that “buzzes” is good, because a
spray condition where intermittent pulsations are gen-
erated assures good “cut-off” of the fuel supply.
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