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3966721 / 4941393 Cummins QSL9 OEM Articulated Piston Assembly
Premium two-piece split piston (crown and skirt) engineered for enhanced thermal control, lower friction, and exceptional longevity – optimized for Cummins QSL9 engines in demanding construction, agriculture, industrial, and off-highway applications.
Primary Part Numbers:
- Piston Crown: 3966721
- Piston Skirt: 4941393
Brand: Cummins OEM
Supplier: Volgen Power
Product Details
Product Overview
The Cummins OEM Articulated Piston Assembly (3966721 crown / 4941393 skirt) features a sophisticated two-piece design that separates the high-temperature crown from the skirt for independent expansion. This innovative construction reduces thermal stress, improves oil cooling, and minimizes piston scuffing while lowering overall weight for better engine efficiency.
Volgen Power supplies genuine Cummins OEM pistons, ensuring precise tolerances, premium materials, and proven performance that restores compression, power, and fuel economy during engine rebuilds.
Design & Durability Advantages
- Advanced Heat Management — Gallery-cooled crown efficiently dissipates combustion heat for reduced thermal fatigue
- Reduced Friction & Weight — Separate skirt allows optimized clearances and lighter construction for lower inertial loads
- Enhanced Ring Support — Precision-machined grooves ensure stable ring seating and superior oil control
- High-Strength Materials — Forged steel crown and aluminum skirt resist cracking and wear in high-boost conditions
- Direct OEM Replacement — Exact fit with factory pin, rings, and liners for straightforward installation
Engine & Application Compatibility
Fully compatible with Cummins engines:
- QSL9 (all Tier 3/4 interim ratings)
- QSC8.3 (select configurations)
- Related industrial and marine variants
Common in construction equipment, agricultural tractors, wheel loaders, excavators, and generator sets.
Technical Specifications
| Attribute | Detail |
|---|---|
| Part Numbers | Crown: 3966721 / Skirt: 4941393 |
| Engine Displacement | 8.9 L (543 cu in) |
| Bore Size | Standard 114 mm (4.49 in) |
| Configuration | Articulated two-piece (crown + skirt) |
| Material | Forged steel crown / Aluminum alloy skirt |
| Cooling | Oil gallery cooled |
| Compression Height | Application-specific (OEM standard) |
Volgen Power stocks genuine Cummins OEM articulated pistons for QSL9 engines, ready for worldwide shipping.
Rebuild your QSL9 with factory-precision pistons for maximum reliability – contact us today for pricing, availability, or complete overhaul kits. Get your quote now!
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