Reassembly And Opening Pressure Adjustment (4Jb1-Tc; Only); Reassembly And Adjustment Procedure - Isuzu NHR 4J Series Workshop Manual

REASSEMBLY AND ADJUSTMENT PROCEDURE

1
First nozzle opening pressure adjustment
2
Full needle valve lift confirmation
3
Pre-lift confirmation
4
Second nozzle opening pressure
5
Second nozzle opening pressure
6
Final inspection
080LX003.tif
confirmation
adjustment
REASSEMBLY AND OPENING
PRESSURE ADJUSTMENT (4JB1-TC

only)

1. Nozzle holder body
2. Shim (First opening pressure adjustment)
3. First spring
4. Spring seat
5. Collar
6. Second spring
7. Push rod
8. Shim (Second opening pressure adjustment)
9. Spring seat
10. Lift piece
11. Spacer & pin
12. Nozzle & pin
13. Retaining nut
14. Gasket
15. Eye bolt
The nozzle holder is adjusted as the components are
reassembled in the sequence above.
As adjustment of the two-spring nozzle holder is made in
hundredths of a millimeter, clean the parts thoroughly in light oil
to completely remove any dirt or foreign matter.
Adjust the first nozzle opening pressure using the shim.
Confirm the full needle valve lift in accordance with the
closed method.
Confirm pre-lift in accordance with the closed method.
CAUTION:
If not as specified, replace the nozzle assembly, lift
piece, pins and spacer using the nozzle service kit.
Confirm the second nozzle opening pressure in accordance
with the closed method.
Adjust the second nozzle opening pressure using the shim.
Confirm the condition of the fuel spray with the nozzle and
nozzle holder assembled.
ENGINE FUEL 6C - 15