Injector Pop-Off Test - Isuzu L Series Manual

III. Engine Servicing Procedures

Injector Pop-off Test

WARNING: FLUID FROM THE NOZZLE TESTER WILL SPRAY OUT UNDER
GREAT PRESSURE. IT CAN EASILY PUNCTURE A PERSON'S SKIN. KEEP
YOUR HANDS AWAY FROM THE NOZZLE TESTER AT ALL TIMES.
If the nozzle "pop-off" pressure does not meet factory pressures, disassemble the nozzle
and make a shim adjustment. The following size shims are available through AIPDN.
U
Use the following procedure to check
nozzle opening pressure, spray pattern,
chatter and leakage:
Mount the nozzle and holder assembly to
the gauge (J28829) and bleed the system of
air.
Open the pressure gauge valve and pump
the lever at a rate of one stroke per second.
Then check the opening pressure. When the
pressure gauge pointer decreases rapidly,
read pop-off value. (Refer to engine's
specification sheet for values. An Indirect
Injection will have lower readings than a
Direct Injection engine.)
IMPORTANT! If the nozzle opening
pressure is not steady or cannot be
checked the trouble is with the nozzle
assembling procedure.
Shim Part Number
894176-9620
894176-9630
894176-9640
894176-9650
894176-9660
894176-9670
894176-9680
894176-9690
894176-9700
894176-9710
L-Series Diesel
mm
Shim Size
0.10
0.20
0.30
0.40
0.50
0.52
0.54
0.56
0.58
0.80
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