Page 100
MAINTENANCE
100
Figure 100 — Disconnecting AFI Check Valve Assembly
The coolant lines do not have to be disconnected
nor coolant drained for AFI cleaning.
5. Remove and discard the aftertreatment fuel
injector mounting bolts and spacers, and
then remove the injector from the diffuser
pipe attached to the turbocharger outlet.
6. Cover the opening in the diffuser pipe to
prevent dirt and cleaning fluid from entering
the exhaust system.
7. Remove and discard the high-temperature
gasket and steel plate gasket from the
bottom of the injector.
8. Carefully turn the AFI body and spray the
injector tip with carburetor cleaning solution.
Brush the injector tip with a stiff bristled
nylon toothbrush. Repeat two or three times.
Do NOT kink the fuel and coolant lines when
cleaning the injector. Kinking the lines may result
in leakage.
Only carburetor cleaner should be used for
cleaning the injector. Other cleaners, such as
brake cleaner products, do not work and may
contain chlorine that could damage the catalyst if
they enter the exhaust system.
101
Figure 101 — Removing Carbon Deposits
9. Inspect the injector tip to make sure it is
thoroughly clean and all soot has been
removed. Use a mirror if a clear view of the
tip is not possible.
102
Figure 102 — Inspecting AFI Tip
10. Install a new high-temperature gasket and
steel plate gasket onto the bottom of the
aftertreatment fuel injector.
11. Apply high-temperature nickel-graphite
anti-seize compound to the new injector
mounting bolt threads and insert the bolts
into the spacers. Position the injector onto
the diffuser pipe (attached to the
turbocharger outlet) and hand start the bolts
with spacers.
12. Secure the injector mounting bolts. Tighten
the bolts according to specification.
13. Connect the aftertreatment fuel injector
check valve assembly and tighten to
specification.
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