Adjustment Of Injection Opening Pressure (4Jg2 Engine); Oil Tight Test (4Jg2 Engine) - Isuzu NHR 4J Series Workshop Manual

6C - 12 ENGINE FUEL
• Install retaining nut and tighten nut to the specified
torque.
6C-11-1.tif
ADJUSTMENT OF INJECTION OPENING
PRESSURE (4JG2 Engine)
• Set nozzle holder assembly on a nozzle tester.
• Apply hydraulic pressure by operating tester handle,
and make sure fuel cam be injected under the
following pressure.
6C-11-2.tif
CAUTION
• If not injected under the specified pressure, adjust with
adjusting shim.
Ref. Types are available in the 1.0 mm - 1.75 mm
thickness range (on a 0.01 mm basis).
• Unless extremely deformed spray in seen, there is no
problem.
CAUTION
• The spray condition, when judged with a nozzle tester,
is deemed as normal so long as the spray form is not
excessively deformed.
6C-11-3.tif

Oil tight test (4JG2 Engine)

1) After completion of the adjustment of injection
pressure, wipe off light oil at the tip of the nozzle with
waste.
2) With pressure 1,961 Kpa (20 kg/cm
the specified injection pressure applied, check to see if
an oil drop trickles off the tip of the nozzle within 10
seconds after application of pressure. (There is no
problem with the nozzle when oil gathers at the tip, but
does not drop off.)
6C-11-4.tif
3) When an oil drop trickles, clean the nozzle thoroughly.
Then reassemble it to check for any dropping of oil.
When oil still drops, change it with a new one.
N∙m (Kg∙m/lb∙ft)
39 (4.0/32)
Kpa (Kg/cm
14,710 (150/2,133)
2
/284 psi) less than
2
/psi)