5B3718 Seal for Caterpillar Equipment

5B3718 is an O-ring seal used in Caterpillar engines, engine-generator sets, and generators. It is a new aftermarket spare part manufactured by CTP (Costex Tractor Parts).

Fitment

The seal is used with the following Caterpillar equipment and engine models:

• Caterpillar 3306 engine
• Caterpillar 3406 engine
• Caterpillar 3406B engine
• Caterpillar 3406C engine
• Caterpillar C-9 engine
• Caterpillar C9 engine
• Caterpillar D379B engine
• Caterpillar D398B engine
• Caterpillar D399 engine
• Caterpillar SR4 generator
• Caterpillar engine-machine applications
• Caterpillar engine-generator set applications
• Caterpillar generator applications

Cross-reference numbers

Specifications

The 5B3718 seal has a circular O-ring profile with a 0.19-inch cross-section, a 0.81-inch inner diameter, and a 1.19-inch outside diameter. The specified sealing material is CR chloroprene rubber, and the part has no coating.

Fitment is listed for Caterpillar 3306, 3406, 3406B, 3406C, C-9, C9, D379B, D398B, D399, and SR4 applications. The part number may also be written in hyphenated form as 5B-3718.