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MAINTENANCE
Aftertreatment Fuel Injector (AFI)
When replacing the AFI, check the part number
of the injector to ensure that an injector with a
proper flow rate for the engine is installed.
Installing an injector with the incorrect flow rate
may cause dangerously high regeneration
temperatures and subsequent DPF damage.
REMOVAL
1. Apply the parking brake and place the shift
lever in neutral.
2. Disconnect all cables from ground (negative)
battery terminals to prevent personal injury
from electrical shock.
3. Remove P-clamp screws securing the AFI
harness and fuel supply line.
4. Connect the coolant extractor/injector,
DBT2V700, to the drain fitting at the bottom
of the radiator. Drain the coolant.
An alternative method is to use drain hose,
9996049, to drain the engine coolant into a
suitable container.
5. Disconnect the aftertreatment fuel injector
double check valve assembly (CVA). Collect
any residual fuel that might be in the fuel line
in a suitable container.
95
Figure 95 — Disconnecting AFI Check Valve Assembly
6. Disconnect both the inlet and outlet coolant
lines from the aftertreatment fuel injector
fittings.
96
Figure 96 — AFI Coolant Lines
7. Disconnect the aftertreatment fuel injector
wiring harness connector. Remove all clips
and tie straps to allow the harness to hang
free.
8. 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.
Mark the AFI orientation to the diffuser. The
higher side of the AFI heat shield faces the
turbocharger.
9. Remove and discard the high-temperature
gasket and steel plate gasket from the
bottom of the injector.
INSTALLATION
1. Install a new high-temperature gasket and
steel plate gasket onto the bottom of the
aftertreatment fuel injector.
2. Apply high-temperature nickel-graphite
anti-seize compound to 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.
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