3J1991 Beaded Gasket for Caterpillar Equipment

The 3J1991 Beaded Gasket is a rectangular sealing ring with a circular cross-section for Caterpillar equipment. It is used in Caterpillar engines, track-type tractors and wheel-type skidders. This is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

The gasket is made from NBR nitrile material. The specified material is suitable for sealing applications where resistance to oil, fuel and other fluids is required. The part has a listed inner diameter of 3.58 inches and a cross-section defined by height and width measurements.

Fitment

The gasket is listed for the following Caterpillar equipment types:

• Caterpillar engine-machine applications
• Caterpillar track-type tractors
• Caterpillar wheel-type skidders

Known Caterpillar equipment models and series using this gasket include:

• Caterpillar 3304
• Caterpillar 3306
• Caterpillar 6A
• Caterpillar 6S
• Caterpillar D6E SR
• Caterpillar 518C

Fitment should be checked against the equipment model, serial number and the part number of the gasket being replaced before installation.

Cross-reference numbers

The part is identified by the following number designation:

• 3J1991
• 3J-1991

3J1991 and 3J-1991 are two written formats for the same listed part number.

Specifications

The listed dimensions describe the gasket geometry and supplied part measurements. The sealing ring should be installed in the designated groove or sealing location specified for the applicable Caterpillar assembly.