2005/07/04 Caterpillar

Engine:

G3606 (S/N: 3XF1-UP; 4ZS1-UP)

G3608 (S/N: 4WF1-UP; BEN1-UP)

G3612 (S/N: BKE1-UP; 1YG1-UP)

G3616 (S/N: BLB1-UP; 4CG1-UP)

Description of Change: A new spacer for the prechamber group has been released. The new spacer is designed to reduce the fretting between the bolt and the spacer. The new spacer has a larger inside diameter (ID) and a larger outside diameter (OD). The larger OD of the spacer helps to center the spacer in the counterbore for the prechamber assembly. The larger ID of the spacer increases the clearance between the bolt and the spacer. A different hard washer is also used with the spacer.

Adaptable To: The new spacer and hard washer are direct replacements on all G3600 engines that use the 8D-0648 Bolt with the 218-3902 Prechamber Group, the 218-3907 Prechamber Group, or the 218-3893 Prechamber Group. The former parts and the new parts are listed in Table 1.

Illustration 1	g01182959
(1) Bolt (2) Hard washer (3) Spacer

Note: The 8D-0648 Bolt is a 1/2 inch bolt. Refer to one of the following resources for the torque procedure:Specifications, SENR4257-08, Specifications, SENR5527-10, Specifications, RENR5907-06 and Engine News, SEBD9319, March 2003.