Isuzu N-Series. Service manual — part 386
6C-22 FUEL SYSTEM
2. Full needle valve lift confirmation
• Confirm the full needle valve lift in accordance
with the closed method.
3. Pre-lift confirmation
• 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.
4. Second nozzle opening pressure confirmation
• Confirm the second nozzle opening pressure in
accordance with the closed method.
5. Second nozzle opening pressure adjustment
• Adjust the second nozzle opening pressure us-
ing the shim.
6. Final inspection
• Confirm the condition of the fuel spray with the
nozzle and nozzle holder assembled.
Adjustment Service Data (4HG1-T only)
First nozzle opening pressure adjustment
1. Clamp the nozzle holder in a vise.
2. Install the shim, first spring and spring seat in the
nozzle holder.
Nozzle needle valve full-lift
0.30 mm (0.0118 in)
Nozzle needle valve pre-lift
0.04 mm (0.0016 in) at 19.1 MPa (195 kg/cm
2
, 2,770 psi)
Nozzle pressure
1st Stage
18.1 MPa (185 kg/cm
2
, 2,630 psi)
2nd Stage
22.1 — 23.0 MPa (225 — 235 kg/cm
2
, 3,200 — 3,342 psi) at lift 0.09
mm (0.0035 in) = pre lift + 0.05 mm (0.0020 in)
Legend
1. Nozzle holder body
N6A0860E
Legend
1. Spring seat
2. First spring
3. First nozzle opening pressure adjusting shim
N6A0861E
FUEL SYSTEM 6C-23
3. Install the collar, second spring, shim, spring seat
and push rod in the nozzle holder.
4. Install the pins (1), lift piece (2) and spacer (3) in
the nozzle holder.
5. Install the pins (1) in the spacer.
6. Install the nozzle (2) on the spacer.
7. Hand-tighten the adjustment retaining nut together
with the gasket to the nozzle holder.
Retaining nut: 157892-3200 (* Bosch AS)
Gasket: 157892-5100 (* Bosch AS)
(* Bosch Automotive System Corporation)
8. Tighten the adjustment retaining nut to the speci-
fied torque.
Torque: 29 — 39 N
⋅m (3.0 — 4.0 kg⋅m/257 — 345
lb
⋅in)
Legend
1. Second nozzle opening pressure adjusting
shim
2. Second spring
3. Collar
4. Push rod
5. Spring seat
N6A0862E
N6A0863E
Legend
1. Retaining nut (special tool)
2. Gasket
3. Nozzle
N6A0864E
N6A0865E
6C-24 FUEL SYSTEM
9. Set the nozzle holder (1) to the nozzle tester (2).
10. Operate the nozzle tester and measure the first
nozzle opening pressure.
11. If the first nozzle opening pressure is not as speci-
fied, disassemble the nozzle holder and replace
the shim until the pressure is as specified.
Caution:
• Use a micrometer to measure shim thickness.
• Use some combination of 3 adjusting shims to ad-
just the pressure.
• First nozzle opening pressure adjusting shims
Full Needle Valve Lift Confirmation
1. Install the gasket (1) and plug (2) on the adjust-
ment retaining nut.
Gasket:
026508-1140 (Bosch AS)
894227-6020 (ISUZU)
Plug:
157892-1600 (Bosch AS)
Legend
1. Torque wrench
2. Retaining nut (special tool)
N6A0866E
N6A0867E
Part No. (ISUZU)
Thickness mm (in)
115349-0420
0.40 (0.0157)
115349-0430
0.50 (0.0197)
115349-0440
0.52 (0.0205)
115349-0450
0.54 (0.0213)
115349-0460
0.56 (0.0220)
115349-0470
0.58 (0.0228)
115349-0480
0.60 (0.0236)
115349-0490
0.70 (0.0276)
Legend
1. Thickness
N6A1649E
FUEL SYSTEM 6C-25
2. Position the nozzle holder with the nozzle facing
down and install the dial gauge holder on the noz-
zle holder.
Dial gauge holder: 157892-5000 (Bosch AS)
3. Install the nut on the dial gauge holder.
Nut: 157892-1000 (Bosch AS)
4. Install the pin (1) to the dial gauge (2).
Notice:
The lengths of the pins do not include the threaded por-
tions.
Pin (l=100 mm (3.94 in)):
157892-5200 (Bosch AS)
Dial gauge:
157954-3800 (Bosch AS)
185317-0150 (ISUZU)
5. Secure the dial gauge to the nozzle holder using
the nut so that the pin contacts the tip of the first
spring seat.
Legend
1. Holder (special tool)
N6A0869E
N6A0870E
Legend
1. Nut (special tool)
2. Holder (special tool)
N6A0871E
N6A0872E
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