Caterpillar 72H Pipelayer ARD Spark Plug Replacement Guide

This illustration show you guide on how to replace ARD spark plug for Caterpillar 72H Pipelayer.CAT ET

Procedures:
Removing the Spark Plug
1. Open the right engine access door.


 

2. Remove wire harness (1) from spark plug (2).
3. 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).CAT SIS 2021
Ensure that the area around the spark plug is clean and free of dirt and debris.
4. Use a deep well socket and a breaker bar to loosen the spark plug. If necessary, see your Caterpillar 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 the spark plug has been removed, inspect the used spark plug and the gasket.
If the spark plug could not be removed by hand, clean the threads with a 305-2389 Brush. This tool scrapes debris from the seat and from the threads.

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 in order to provide the heat transfer that is required.Caterpillar Factory Password Calculator
1. Ensure that the spark plug is clean and free of dirt and oil.

NOTICE
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.
2. Install the spark plug by hand until the spark plug contacts the ARD. Torque the spark plug to the proper specification. Refer to Specifications,Spark Plug” for the proper torque specification.
3. Connect the wiring harness.
4. Close the right engine access door

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