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| Piston Type | Articulated Two-Piece (Steel Crown / Aluminum Skirt) |
| Engine Displacement | 8.9 L |
| Bore Diameter | 114 mm |
| Piston Crown Height | 105 mm |
| Piston Skirt Height | 72.5 mm |
| Combustion Chamber Diameter | 82.8 mm |
| Piston Pin Dimensions | 45 mm x 91 mm |
| Ring Groove Configuration | 3.50 mm / 3.00 mm / 4.00 mm |
| Fuel System Compatibility | HPCR (High Pressure Common Rail) CM850 |
| Material Composition | Eutectic Aluminum Alloy Skirt / Forged Steel Crown |
| Kit Contents | Piston, Rings, Pin, Retaining Clips |
| Size Classification | Standard OEM Size |
Manufacturer No.
4089963K4089963FP-IF4089963AM-4089963111712
OEM Part No.
4089963495529749879145472927
Engine Part No.
Cummins QSL9Cummins QSC8.3Cummins 6CTCummins ISLCummins ISCCummins L8.9
Interchange No.
49413933966721392069240896443950549397440439019963901922
Fitment Vehicles
HL-770-9
Engine System - Industrial Encyclopedia
Genuine Cummins 4089963 piston kit for QSL9, QSC8.3, and 6CT 8.9L diesel engines. Includes articulated piston assembly with rings, pin, and retainers. Engineered for HPCR CM850 fuel systems.