The Caterpillar 8N-7296 Piston Pin Retainer (Internal Snap Ring) is a heavy-duty engine component engineered to lock the piston pin securely within the piston hub, preventing lateral movement and protecting the cylinder liner from scoring.
1. Core Dimensions & Weight
- Retainer Type: Internal Snap Ring (Circlip)
- Free Outer Diameter: 77.47 mm (3.050 in)
- Ring Thickness: 2.40 mm (0.094 in)
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Net Weight: 0.045 kg (0.10 lbs)
2. Material & Manufacturing Specs
- Material Grade: High-tensile tempered spring steel
- Surface Treatment: Heat-treated for extreme thermal stability and fatigue resistance
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Design Feature: Precision-engineered constant velocity section for uniform radial expansion
3. Equipment & Engine Compatibility
This component is used in heavy-duty Caterpillar aluminum piston assemblies, primarily across the following platforms:
- Engine Series: CAT 3508, 3512, 3516 (including B, C, and HD variants), CAT 3412, and CAT C175
- Gas Engines: G3508, G3512, G3516
- Mining & Earthmoving Equipment: Caterpillar D11N Track-Type Tractors, 777B/785/789 Mining Trucks
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Marine & Power Generation: CAT 3500 series generator sets and marine propulsion systems
4. Part Cross-References
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Alternative CAT Part Numbers: 087-0324, 87-0324
