Isuzu N-Series. Manual — part 398
6C-70 FUEL SYSTEM
Governor Adjustment
N6A0960E
FUEL SYSTEM 6C-71
ANEROID COMPENSATOR ADJUSTMENT
Component
Legend
1. Setting screw
2. Between 1.4 — 1.7 mm (0.055 — 0.067 in) at sea
level (adjust by setting screw)
N6A0961E
6C-72 FUEL SYSTEM
INJECTION VOLUME ADJUSTMENT
4HE1-TC (4HE1-XS) Engine for EURO3
Test Condition
Injection Timing
Injection Timing Adjustment
(Refer to the MITICS Repair and Maintenance Service
Manual for adjustment details.)
Adjustment Preparation
1. Install setscrew (3) (P/N 157927-2820), screw (4)
(P/N 157927-3321) and solenoid switch (5) into
housing (1).
1) Screw in setscrew (3) until the counterweight
contacts the housing’s pressfitted stopper pin.
2) Tighten screw (4) until clearance between
screw (4) and counterweight (2) is 1 — 2 mm
(0.04 — 0.08 in).
3) Tighten solenoid switch (5) until clearance be-
tween solenoid switch and counterweight (2)’s
pin is 1 — 2 mm (0.04 — 0.08 in), then tighten
locknut (6).
2. Install starting advance mechanism’s cover.
3. Position control rack in full position.
4. Set power supply voltage to manual controller at
12V.
Item
Condition
Injection nozzle and holder assembly
Bosch AS Part No.: 105118-6831
Injection nozzle
Bosch AS Part No.: 105017-2930
Nozzle holder
Bosch AS Part No.: 105048-4430
Injection nozzle opening pressure MPa (kg/cm
2
/ psi)
20.7 (211 / 3,000)
Injection line dimensions
Inside diameter
mm (in)
3.0 (0.118)
Outside diameter
mm (in)
8.0 (0.315)
Length
mm (in)
600 (23.6)
Fuel delivery pressure
kPa (kg/cm
2
/ psi)
254.9 (2.6 / 36.97)
Test fuel
SAE Standard Test Diesel Fuel (SAE J967d)
ISO Standard Test Diesel Fuel (ISO 4113)
Test fuel temperature
°C (°F)
40 — 45 (104 — 113)
Identification numbers
107492-1162
897225-4322 (ISUZU No.)
Pre-stroke
: No. 1 plunger 4.0
±0.03 mm (0.1575±0.0012 in)
Injection order
: 1 — 3 — 4 — 2 (interval 90
°±15′) Plungers are numbered from the Governor side
Tappet clearance
: Shim adjustment type
: Manually rotate the camshaft 2 — 3 times and confirm that it
rotates smoothly.
N6A0962E
FUEL SYSTEM 6C-73
Pre-stroke adjustment
Adjust No.1 cylinder’s start of static injection using the
shim (1).
Individual cylinder’s injection order adjustment
Adjust difference between each cylinder’s injection an-
gle based on that of the No.1 cylinder using the shim (1).
Measuring pre-stroke output voltage
1. Install the measuring device (P/N 105782-6420).
2. Remove the setscrew (3) (P/N 157927-2820) and
install the air bleeder bolt.
3. Screw in screw (4) (P/N 157927-3321) and mea-
sure the No 1 cylinder’s output voltage for pre-
stroke lift values in the table below.
Advice
If measuring device (P/N 105782-6420) is removed, the
output voltage (a1, a2) should be remeasured.
Minimum advance angle adjustment stopper adjust-
ment
1. Remove the screw (4) (P/N 157927-3321) and in-
stall minimum advance angle adjustment stopper.
2. Screw in minimum advance angle adjustment
stopper until No 1 cylinder’s pre-stroke is 3.84 —
3.90 mm (0.1512 — 0.1535 in).
Then, tighten locknut to specified torque.
3. Measure the output voltage (c) at this time.
Solenoid switch adjustment
1. Apply 24 V voltage to solenoid switch (5).
2. Loosen solenoid switch (5) until No 1 cylinder’s
pre-stroke is 1.90 — 2.03 mm (0.0748 — 0.0799
in), then tighten the locknut to the specified torque.
3. Confirm solenoid switch operates at 14.5 — 0.1 V.
Adjusting point
confirmation
point
Pre-stroke
(mm (in))
Output
voltage
(actual)
Remarks
a
3.70
(0.1457)
a1
+ tolerance
3.44
(0.1354)
a2
− tolerance
b
3.24
(0.1276)
b1
+ tolerance
3.04
(0.1197)
b2
− tolerance
(calculate form each specification)
N6A0963E
N6A0962E
Нет комментариевНе стесняйтесь поделиться с нами вашим ценным мнением.
Текст