Silicone O-Ring 8C3091

The 8C3091 is a silicone O-ring for sealing applications in equipment manufactured by Caterpillar. It is used on Caterpillar engines and machines, forest products equipment, motor graders, and wheel-type loaders. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The seal has a standard O-ring profile and is identified by SAE AS568 dash size -362. The supplied part is made from VMQ silicone, with the sealing material also specified as rubber. The dimensions and operating data below are provided for identification and part selection.

Fitment

• Caterpillar 3116
• Caterpillar 3126
• Caterpillar 3126B
• Caterpillar 550
• Caterpillar 570
• Caterpillar 580
• Caterpillar 580B
• Caterpillar 135H
• Caterpillar 938G
• Caterpillar 950G

Equipment categories listed for this O-ring include Caterpillar engine-machine applications, Caterpillar forest products equipment, Caterpillar motor graders, and Caterpillar wheel-type loaders. The model references above are the specified fitment information for the part.

Cross-reference numbers

The identifiers 8C3091 and 8C-3091 refer to the same O-ring designation, with the second format including the hyphen used in the part number. The SAE AS568 reference is included as the corresponding standardized dash-size designation.

Specifications

The dimensions are stated as an inside diameter of 6.23 inches, an outside diameter of 6.645 inches, and a cross-section diameter of 0.21 inches. The metric length, width, and depth values are the listed package or part measurement data associated with this item. No coating is specified.