Product introduction
The Cummins 4948506F uses an aluminum alloy substrate and a high-tin aluminum bronze composite coating, significantly improving fatigue resistance and effectively suppressing microcrack propagation under continuous high-pressure conditions, ensuring that the bearings are free from plastic deformation or coating peeling risk within the 5000-hour overhaul interval. Furthermore, by optimizing the surface texture and contact surface design through fluid dynamics, dynamic compensation of oil film thickness is achieved, reducing the probability of boundary lubrication and extending service life by more than 30%.
Product Images
Product Parameters
| Parameter category | Detailed Description |
| Part number | 4948506F |
| Applicable engine series | Cummins B5.9,ISB5.9,ISB6.7,QSB6.7 |
| Bearing type | Crankshaft thrust bearing (axial thrust bearing) |
| Material composition | The aluminum alloy base is coated with a high-tin aluminum bronze anti-friction alloy layer on the surface |
| Structural features | Single-chip design without pilot-guided structure, specifically designed for bearing the main thrust force, complementing the 4948505F (pilot-guided type) in function |
| Operating temperature range | -40°C to +150°C |
| Size | Inner diameter: approximately 88mm, outer diameter: approximately 138mm, width: approximately 30mm (tolerance ± 0.02mm) |
Product Advantages
It's important to note that the 4948506F bearing uses the exact same material formula and manufacturing tolerances in both the 5.9L and 6.7L engines, ensuring reliability and interchangeability across displacement platforms. No adjustments to installation or maintenance procedures are needed due to displacement differences. The aluminum alloy substrate and copper alloy layer work together to conduct heat, quickly transferring frictional heat to the bearing housing. Combined with the engine's overall cooling system, it maintains a stable operating temperature within the safe threshold of 140°C even under harsh conditions, completely preventing thermal degradation. It is an indispensable component in Cummins engines!
FAQ
Q: 1. Is the Cummins 4948506F bearing suitable for the QSB6.7 engine?
A:Yes, the 4948506F is a Cummins-certified crankshaft thrust bearing for the QSB6.7 engine. It is fully compatible with medium-sized diesel engines such as the B5.9, ISB5.9, and ISB6.7, and is specifically designed to withstand axial loads under high explosion pressure. It cannot be used in heavy-duty engines such as the X15.
Q: 2. Does Cummins officially refer to the 4948506F as a "crankshaft thrust bearing"?
A: Yes, Cummins technical documents uniformly use "thrust bearing" as the standard term. 4948506F is a crankshaft thrust bearing, distinct from a "thrust washer," which is a non-load-bearing structural component. The terminology used must be precise.
Q: 3. What are the core advantages of the 4948506F bearing?
A:It uses an aluminum alloy matrix with a high-tin aluminum bronze composite coating, providing excellent fatigue resistance and wear resistance; through optimized oil film distribution via hydrodynamics, it extends service life by more than 30%.
Q: 4. What is the installation torque when replacing the 4948506F bearing?
A: Installation must be performed according to the main bearing cap tightening specifications. The official torque is 120 N·m, tightened gradually in three stages. Impact tools are strictly prohibited. Ensure the crankshaft axial clearance is controlled within the standard range of 0.08–0.20 mm.
Q: 5. Is this bearing a dangerous good? What are the packaging requirements?
A: It is not a dangerous good and does not require UN packaging or special labeling. For standard export, it is wrapped in rust-proof paper and sealed in a rigid cardboard box or plastic pallet for moisture and shock protection; vacuum or airtight packaging is not required.
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