Isuzu AA-6HK1T, Workshop Manual

Page: 188 / 242

ENGINE FUEL 6C–13
Pre-lift measuring point:
Read the dial gauge at first nozzle opening pressure
(approx 1 MPa (10 kg/cm
2
/140 psi).
Note: This point can be determined while the pressure is
falling.
3. Confirm that pre-lift ‘
l
’ is as specified.
Pre-lift: 0.05 mm (0.0020 in)
4. If pre-lift is not as specified, replace the pin, lift piece,
spacer, and nozzle assembly as a set with the
service kit.
Service kit: ZEXEL 105019-2200
Service kit: ISUZU 894392-1450
Second nozzle opening pressure confirmation
1. After pre-lift confirmation, operate the nozzle tester
to increase in-line pressure to 34.3 - 44.1 MPa (350 -
450 kg/cm
2
/4980 - 6400 psi). The nozzle’s needle
valve should move through its full lift.
1st nozzle
opening pressure
L
l
0
Measuring point
(pre-lift)
Needle valve lift
In-line pressure
040EY00082
Push rod
Spring seat
Spacer
Second spring
Adjusting shim
l
Lift piece
Needle valve
040EY00080
Pin
Spacer
Lift piece
Nozzle
assembly
Capsule
040MV031
Nozzle tester
Nozzle holder
040MV030