2002/01/01 Caterpillar

Engines:

G3606 (S/N: 3XF)

G3608 (S/N: 4WF)

G3612 (S/N: 1YG)

G3616 (S/N: 4CG)

A new extension assembly is available for the spark plugs in the above engines that are equipped with one of the following items:

• an Engine Supervisory System

• an ignition system with a magneto

• a Caterpillar Ignition System

The new 207-4508 Extension As can be used as a direct replacement for the 123-8641 Extension As .

The new 207-4508 Extension As includes the following improvements:

• An O-ring seal provides better sealing between the extension and the ignition transformer.

• An O-ring seal provides better sealing between the extension and the spark plug.

• Increased spring force provides improved electrical continuity between the transformer and the top post of the spark plug.

Maintenance

Illustration 1	g00857670
This illustration identifies the serviceable components of the new 207-4508 Extension As . (1) 125-1372 O-Ring Seal (2) 8L-2777 O-Ring Seal

At every maintenance interval for the spark plugs, the O-ring seals on the extension assemblies should be inspected and/or replaced. Before you install the extension assembly, you should do the procedures that follow:

• Thoroughly clean the extension assembly.

• Apply a light coat of 151-1340 Dielectric Grease to the O-ring seals.