C7.1 Industrial Engine Caterpillar

ARD Spark Plug - Remove and Install

Usage:

C7.1 770

Removal Procedure

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Table 1
Required Tools
Tool	Part Number	Part Description	Qty
A	-	22mm Spark Plug Socket	1

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The ignition system may cause an electrical shock hazard, which may cause personal injury or death. Avoid contacting the ignition system components and the ignition system wiring during operation.

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NOTICE

If the engine is running or the keyswitch is in the ON position, the ARD spark plug will continue to fire. Turn the keyswitch to the OFF position before servicing the ARD spark plug.

Turn the battery disconnect switch to the OFF position.
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Illustration 1 g02035113
Disconnect ignition wire (3) from spark plug (2).
Use Tooling (A) in order to remove spark plug (2) from ARD combustion head (1).

Installation Procedure

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Table 2
Required Tools
Tool	Part Number	Part Description	Qty
A	-	22mm Spark Plug Socket	1
B	305-2389	Wire Brush	1

Ensure that all components are clean and free from wear and damage. If necessary, replace any components that are worn or damaged.
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Illustration 2 g02035113
Inspect the spark plug and sealing washer for damage or wear. Refer to Operation and Maintenance Manual, "ARD Spark Plug - Inspect/Replace" for the correct procedure.
Use Tooling (B) in order to clean the ground electrode in ARD combustion head (1).
Note: Ensure that the threads in ARD combustion head (1) for spark plug (2) are clean and free from damage.
Install spark plug (2) to ARD combustion head (1).
Use Tooling (A) in order to tighten the spark plug to a torque of 47 N·m (35 lb ft).
Connect ignition wire (3) to spark plug (2).
Turn the battery disconnect switch to the ON position.