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Personal injury can result from air pressure. Personal injury can result without following proper 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. |
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If the engine is running or the key is in the ON position, the ARD plug will continue to fire. Turn the key to the OFF position before servicing the ARD plug. |
- Open the right engine access door.
- Remove wire harness (1) from spark plug (2) .
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| Illustration 1 | g02393977 |
(1) Wiring harness (2) ARD spark plug (aftertreatment regeneration device) | |
- Debris may have collected in the spark plug well. 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.
- Use a deep well socket and a breaker bar to loosen the spark plug. If necessary, see your Cat dealer for the part number of the socket. After the spark plug has been loosened, use the socket to remove the spark plug by hand in order to detect problems with the threads.
- After removing spark plug, clean the ground probe inside the ARD combustion head by running a 305-2389 Plug Bore Brush through the hole in the ARD combustion head. Run the brush through the hole several times.
- Carefully clean the spark plug using a nonmetallic cleaning pad. If the probe appears to be bent, replace the spark plug. Otherwise, install the original spark plug.
Note: The spark plug may be damaged if the spark plug is dropped. Do not install a spark plug that has been dropped.
- Install the spark plug by hand until the spark plug contacts the ARD. Tighten the spark plug to a torque of 43.4 N·m (32 lb ft) to 51.5 N·m (38 lb ft).
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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 combustion pressure to blow past the seal. Serious damage to the engine can occur. Use the proper torque. |
- Connect the wiring harness.
- Close the right engine access door.