Isuzu engine 4j series. Manual — part 66
6C - 8 ENGINE FUEL
FUEL FILTER CARTRIDGE
REMOVAL
•
Remove the cartridge using a filter wrench.
Filter wrench: 5-8840-0253-0 (J-22700)
INSTALLATION
•
Clean the cartridge mounting surface of filter body so
that the cartridge can be securely.
Apply engine oil thinly to new cartridge O-ring.
•
To facilitate bleeding, fill the new cartridge with light oil.
•
Tighten the cartridge until O-ring comes in contact with
the sealing, taking care not to spill the light oil.
•
Retighten 1/3~ 2/3 using a filter wrench.
Filter wrench: 5-8840-0253-0 (J-22700)
Bleeding
•
Operate priming pump to send the air in the fuel
system to the injection pump.
•
Loosen injection pump bleeding plug, and operate the
priming pump until no bubble is made.
•
Tighten the bleeding plug.
•
Start the engine, and if it is not started in 10 seconds
or less, repeat the bleeding steps.
•
Make sure of no fuel leakage, and tighten the priming
pump.
Draining
•
When the water in the sedimentor reaches the
specified volume, warning light is actuated.
In this case, follow the draining steps below.
•
Set a vinyl hose over the drain plug.
•
Loosen the drain plug.
•
To drain the water, operate the priming pump several
times.
•
After draining, tighten the drain plug.
•
Operate the priming pump several times to check for
fuel leakage.
•
Check and see the warning light is off.
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ENGINE FUEL 6C - 9
INJECTION NOZZLE
REMOVAL
Preparation:
•
Disconnect battery ground cable.
1. Injection Pipe
•
Release injection pipe clip.
•
Loosen the flare nut on the injection pump side.
•
Loosen the flare nut on the injection nozzle side,
disconnect and put aside the pipe.
2. Leak off Pipe or Hose
3. Injection Nozzle
INSPECTION
•
Set the nozzle in a nozzle tester.
Check there is no fuel leak in the nozzle seal when a
fuel pressure of kg/cm
2
is applied.
If there is leak, replace.
6C-8-1.tif
Removal steps
1. Injection pipe
2. Leak off pipe or hose
3. Injection nozzle
Installation steps
To install, follow the removal steps in
the reverse order.
6C - 10 ENGINE FUEL
DISASSEMBLY (4JG2 Engine)
•
Grip nozzle holder with a vise, loosen retaining nut and
disassemble.
•
Loosen holder nut and remove the nozzle.
CAUTION
•
Be careful not to damage the needle valve.
•
Remove spacer, positioning pin, and push rod.
•
Remove spring and adjusting shim.
CAUTION
•
Wash all the parts removed and arrange them on a
cylinder basis, care should be taken not to miss any
parts.
•
Soak the nozzle assembly in a parts receptacle filled
with light oil.
•
Care should be taken not to miss shim, if used.
INSPECTION (4JG2 Engine)
Nozzle
•
Soak the nozzle removed in clean light oil, wash
nozzle body and needle valve separately, and check
and see that the needle valve slide smoothly in the
nozzle body.
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ENGINE FUEL 6C - 11
CAUTION
•
If the needle valve does not slide smoothly repair or
replace with a new nozzle assembly.
Nozzle lapping procedure
•
Apply thinly a compound (Chrome oxide kneaded with
an animal oil) to the seat of needle valve and lap.
CAUTION
•
Excess compound may cause worn needle valve, and
be sure to wash out the compound after lapping.
Nozzle body & needle
•
Check nozzle body and end for seizure.
If significantly seized, replace as a nozzle assembly
basis. Also replace as a nozzle assembly basis, if
needle valve end is deformed or seized.
CAUTION
•
If either nozzle body or needle valve is faulty, replace
with a new nozzle assembly.
REASSEMBLY (4JG2 Engine)
To reassemble, follow the removal steps in the reverse order,
noting the following point.
CAUTION
•
Be careful to fit spacer because positioning pins are
set off.
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