Illustrative photo — the delivered item may differ in appearance. Orders are fulfilled by catalog part number (SKU).
Engine Piston Cummins 3948465 | 3802927, 3942665, 4089430, 3920691
Restore your engine’s compression and peak performance with this high-quality replacement piston for Cummins ISB and QSB series engines. Engineered for exceptional thermal resistance and durability under heavy loads, it ensures reliable operation.
Description
High-Performance Engine Piston for Cummins ISB & QSB
Ensure your heavy-duty diesel engine operates at peak efficiency with this premium replacement piston. Specifically designed for Cummins ISB and QSB series engines, this piston is engineered to withstand extreme combustion temperatures and high mechanical loads, restoring optimal compression and power output.
Key Features & Specifications
- Piston Diameter: 102 mm (Standard / STD)
- Piston Height: 105.20 mm
- Compression Height: 71.60 mm
- Combustion Chamber: 61 mm
- Pin Dimensions: 40 mm x 83 mm
- Ring Configuration: 2.9T x 2.9T x 4
- Alfin Insert: Yes (Double / x2) for enhanced ring groove durability
- Piston Cooling: No
- Complete Set: Includes piston, wrist pin, and retaining clips
Engine Compatibility
This piston is compatible with the following Cummins engine models:
- Cummins ISB 3.9 / QSB 3.9
- Cummins ISB 5.9 / QSB 5.9
Note: Please verify your engine serial number (ESN) or part number before ordering to ensure correct fitment. Pistons that have been installed or show signs of mounting are not eligible for return.
