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78
Maintenance Section
ARD Spark Plug (Emission Related Component) - Clean
ARD Spark Plug (Emission
Related Component) - Clean
Personal injury can result from air pressure.
Personal injury can result without following prop-
er procedure. When using pressure air, wear a
protective face shield and protective clothing.
The maximum air pressure for cleaning purposes
must be reduced to 205 kPa (30 psi) when the air
nozzle is deadheaded.
NOTICE
If the engine is running or the key is in the ON posi-
tion the Aftertreatment Regeneration Device (ARD)
plug will continue to fire. Turn the key to the OFF po-
sition before servicing the ARD plug.
Removing the Spark Plug
Illustration 62
Typical example
(1) Spark plug
(2) Wiring harness
1. Remove wire harness (2) from spark plug (1).
2. Debris may have collected in the spark plug well.
i07508570
Thoroughly remove any debris. Use compressed
air. The maximum air pressure for cleaning
purposes must be below 205 kPa (30 psi). Ensure
that the area around the spark plug is clean and
free of dirt and debris.
3. Use a 22 mm (0.86 inch)22mm spark plug socket
and a breaker bar to loosen the spark plug. After
the spark plug has been loosened, use the spark
plug socket to remove the spark plug by hand to
detect problems with the threads. After the spark
plug has been removed, inspect the used spark
plug and the gasket.
4. After removing the spark plug, clean the ground
probe inside the ARD combustion head by running
a T400005 Plug Bore Brush through the hole in
the ARD combustion head. This tool scrapes
debris from the seat and from the threads. Run the
brush through the hole several times.
Note: The spark plug may be damaged if the spark
plug is dropped. Do not install a spark plug that has
been dropped or a spark plug that is damaged.
5. Carefully clean the spark plug using a nonmetallic
cleaning pad. If the probe appears to be bent,
replace the spark plug. Do not use a thread tap. A
thread tap will remove metal unnecessarily. The
threads could be stripped and the combustion
group could be damaged.
Installing the Spark Plug
Note: Do not use anti-seize compound on the spark
plug. Most of the heat is transferred through the
threads and the seat area of the spark plug. Contact
of the metal surfaces must be maintained to provide
the heat transfer that is required.
1. Ensure that the spark plug is clean and free of dirt
and oil.
Do not overtighten the spark plug. The shell can be
cracked and the gasket can be deformed. The metal
can deform and the gasket can be damaged. The
shell can be stretched. This will loosen the seal that
is between the shell and the insulator, allowing com-
bustion pressure to blow past the seal. Serious dam-
g06046854
age to the engine can occur.
Use the proper torque.
2. Install the spark plug (1) by hand until the spark
plug contacts the ARD. Tighten the spark plug to a
torque of 47 N·m (34 lb ft)
M0076814-03
NOTICE
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