Isuzu AA-6HK1T, Workshop Manual

Page: 183 / 242

6C–8 ENGINE FUEL
Disassembly
The 2-spring nozzle reduces nitrogen oxide Nox and
particulate exhaust gas emissions.
1. Use a wire brush to remove carbon deposits from the
nozzle and nozzle holder (before disassembly).
CAUTION : Do not touch the nozzle holes with the
wire brush.
2. Wipe clean the outside surfaces of the nozzle holder
assembly using a clean damp rag.
3. Place the nozzle holder in a vise.
4. Remove the retaining nut.
5. Remove the nozzle.
6. Remove the spacer, pin, lift piece, and spring seat.
7. Remove the push rod, adjusting shim, 1st spring,
and collar (1st opening pressure control).
8. Remove the spring seat, 2nd spring, and adjusting
shim (2nd opening pressure control).
9. Clean the parts thoroughly in diesel fuel to remove all
dirt and other foreign materials.
NOTE: Injection nozzle adjustments are made in very
small steps (100ths of a millimeter). For this reason, it is
extremely important that all parts be immaculate.
Reassembly
1. Place the nozzle holder in a vise.
2. Install the adjusting shim (1), first spring (2), and
spring seat (3).
3. Install the collar (1), 2nd spring (2), adjusting shim
(3), spring seat (4), and push rod (5).
040EY00067
1
2
3
040EY00068
1
2
3
5
4
040EY00069