Injection Nozzle Replacement; Injection Nozzle Tests - GMC G Service Manual

6C2-10 DIESEL FUEL INJECTION
INJECTION NOZZLE
REPLACEMENT
H
Remove or Disconnect (Figures 13, 14
Tool Required:
J 29873 Nozzle Socket
1. Negative battery cable.
2. Fuel line clip.
3. Fuel return hose.
4. Fuel injection line.
• Cap the nozzle and lines.
NOTICE: When removing an Injection nozzle,
use J 29873. Remove the nozzle using the hex
portion ('B'; figure 13). Failure to do so will
result in damage to the injection nozzle.
5. Injection nozzle using J 29873 (figure 14).
Figure 14 — Removing/Installing Injection Nozzle
|++| Install or Connect (Figures 13 and 14)
Tool Required:
J 29873 Nozzle Socket
NOTICE: When installing an injection nozzle,
use J 29873. Install the nozzle using the hex por­
tion ('B'; figure 13). Failure to do so will result in
damage to the Injection nozzle.
1. Injection nozzle using J 29873 (figure 14).
Tighten
• Nozzle to 70 N«m (50 ft. lbs.).
2. Fuel injection line.
Tighten
• Nut to 25 N«m (20 ft. lbs.).
3. Fuel return hose.
4. Fuel line clip.
5. Negative battery cable.

INJECTION NOZZLE TESTS

Nozzle testing is comprised of the following checks:
• Nozzle opening pressure
• Leakage
• Chatter
L00731
• Spray pattern
Each test should be considered independent of the
others (for example, when checking opening pressure, do
not check for leakage).
If all of the above tests are satisfied, the nozzle holder
assembly can be reused. If any one of the tests is not
satisfied, the complete nozzle holder assembly must be
replaced. The nozzle holder will then be checked and
repaired at a centralized location.
• Test Lines — 6
• Test Fluid — per ISO 4113 (Example: Shell V 1399,
Viscosity 1487C or equivalent).
• Kinetic Viscosity at 40 degrees — per ISO 3104:2.45
- 2.75 mm2 /second.
• Test oil temperature during test: 20 - 25 degrees C
(68 - 77 degrees F).
• Refer to the equipment manufacturer's instructions
for exact test procedures.
1. Connect the nozzle holder assembly to the test line.
2. Place clear plastic tubes on overflow connections to
prevent leak-off from being confused with actual leak.
3. Close the shutoff valve to the pressure gage.
x x
2 400 mm (1.5 mm bore).