116 4 ENGINE SYMPTOMS DIAGNOSTICS
Figure 130 Shrader valve assembly
1. Valve
2. Cente r stem
Figure 131 Diagnostic coupling
1. Valve
2. Center section
NOTE: Engines are equipped with a fuel pressure
test valve in the form of either a Shrader valve or a
diagnostic coupling.
4. Pressurize fuel rail with air from the fuel pressure
test valve on the intake manifold to 550 kPa to
690 kPa (80 psi to 100 psi) using the fuel line test
adapter. Observe deaeration tank for air bubbles.
• If air bubbles appear in deaeration tank, do
step 5.
• If air bubbles do not appear in deaeration
tank, d o st ep 6.
Figure 132 Injector cut-away with injector sleeve
5. Remove all injectors and inspect O-rings and
injector sleeves for dam age.
• If a ny in je ctor O-ring or injector sleeve
appears damaged, clean the injector and
replace O-rings or injector sleeves. Test the
system again. Do step 4.
• If injector O-rings or injector cups are not
damaged, do step 6.
6. Remove, inspect, and pressurize the cylinder
head following the procedure in the Engine
Service Manual.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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