Description
Caterpillar 109‑3207 O‑Ring Seal
Used to prevent fluid leakage and maintain pressure integrity in Caterpillar engines and systems. It is commonly applied in fuel, oil, and air‑handling components on Cat equipment and engines, where a durable, high‑temperature elastomer seal is required.
Specifications
Material: FKM (Viton®‑type fluoroelastomer)
Hardness: 90 Shore A
Color: Dark blue (typical)
Dash Size (AS568): ‑213
Cross‑Section (CS): 3.53 mm
Inner Diameter (ID): 23.39 mm
Outer Diameter (OD): 30.45 mm
Temperature Range: approx. ‑40 °C to +150 °C
Fluid Resistance: fuels (incl. biodiesel), oils, lubricants; not recommended for coolant/water service
Coating: Often PTFE‑coated to reduce installation damage
Applications
Cat diesel engines (e.g., C7, C9, 3126B, marine variants)
Fuel system seals, oil passages, and air system interfaces
Exact application varies by engine and component location; confirm by engine serial number (ESN)
Cross‑References
SAE / Industrial: AS568‑213 (dimensionally equivalent)
Aftermarket listings: Sold as “O‑Ring Seal 109‑3207” meeting OEM specs
Cat supersessions: None commonly noted; sold under 109‑3207 across distributors
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