SPRING 6L5200 - Caterpillar

Illustration 1 g03415945
(1) Engine compartment shields
(2) Left-hand grill assembly (open)Access to the ARD spark plug is made from behind the engine compartment on the left-hand side of the machine.
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 left-hand grill assembly (2) that is located behind the engine compartment.
Remove upper two engine compartment shields (1).
Illustration 2 g02957738
Location of ARD spark plug.
(3) ARD spark plug wire assembly
Disconnect ARD spark plug wire assembly (3) from the ARD spark plug.
Use a deep well socket and a breaker bar to loosen the spark plug. If necessary, consult 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.
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.
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).
Connect the ARD spark plug wire assembly.
Install the upper two engine compartment shields that were removed in step 2.
Close the left-hand grill assembly that was opened in step 1.