Reliable Engine Components for Cummins Series | Part Numbers 3966841 and H2509800177
Finding the right engine bearing is critical for the longevity of your industrial equipment. The 3966841 (also known as H2509800177 or 3966841H2509800177) is a high-precision main bearing set designed specifically for the Cummins 6BT5.9 and QSB5.9 engines. Whether you are performing a full engine overhaul or routine maintenance, this part ensures optimal crankshaft rotation and minimal friction.
As a leading Cummins replacement parts supplier, we understand that downtime means lost revenue. That is why our parts meet or exceed OEM standards, providing a cost-effective alternative to original dealer prices without sacrificing reliability.
| Detail Field | Product Information |
|---|---|
| Model NO. | Cummins 6BT5.9 / QSB5.9 Series |
| Part Number | 3966841 / 3966841H2509800177 |
| Product Name | Main Bearing Set (Standard Size) |
| Type | Internal Combustion Engine Spare Parts |
| Condition | Brand New, OEM Standard Replacement |
| Application | Engine rebuild, overhaul, preventative maintenance |
| MOQ | 1 Piece / Set |
| Stock Status | In Stock / Ready for Fast Dispatch |
| Payment Terms | T/T, Western Union, MoneyGram |
| Delivery Methods | Express (DHL, Fedex, EMS, UPS), Air Freight, Sea Freight |
| Packaging | Heavy-Duty Industrial Export Packing |
| Core Purchase Points | Our OEM Replacement | Low-Quality Market Options |
|---|---|---|
| 1. Material Composition | High-strength Tri-Metal alloy | Standard aluminum shells |
| 2. Fatigue Resistance | Designed for high-load industrial use | Prone to premature cracking |
| 3. Fitment Accuracy | Exact 3966841 tolerance matching | Variable sizing requiring adjustment |
| 4. Heat Dissipation | Superior thermal conductivity | Poor heat management (Overheats) |
| 5. Lifecycle Cost | Long-term reliability (5000+ hours) | Frequent replacements needed |
| 6. Availability | Immediate stock for H2509800177 | Long lead times for niche parts |
A worn main bearing can lead to low oil pressure, crankshaft damage, and eventual engine seizure. Our team helps operators:
Identify potential risks during maintenance to prevent catastrophic failure.
Recommend suitable replacement parts if standard sizing is no longer sufficient.
Support both inspection advice and global parts supply.
Send Your Part Number to our technicians for a free compatibility check.
A: One of the most common causes is excessive clearance in the main bearings like the 3966841 set. When the bearing wears down, oil escapes too easily from the sides of the crankshaft, causing the pressure to drop. Replacing the bearings during an overhaul is the standard solution to restore factory pressure levels.
A: The standard 3966841 is for standard-size journals. If your crankshaft has been ground down (e.g., .010 or .020), you will need undersized bearings. Contact us with your crankshaft measurements for the correct fitment.
A: Our replacement parts feature an OEM-standard tri-metal structure, ensuring durability under extreme pressure. We are trusted by repair shops and equipment fleets worldwide for consistent quality and immediate availability.
Get a quote within 2 hours for 3966841 or any other Cummins engine components.
WhatsApp: +86 135 3237 9052 Email: [email protected]We specialize in heavy-duty engine solutions for global brands including Cummins, Komatsu, Caterpillar, Isuzu, Kubota, Yanmar, and Weichai. Our core inventory focuses on engine assemblies and precision internal components such as Cylinder Liners, Pistons, Piston Rings, Main Bearings, Con-Rod Bearings, Thrust Washers, Overhaul Gasket Kits, Fuel Injection Pumps, Injectors, Crankshafts, Turbochargers, Water Pumps, Oil Pumps, Cylinder Blocks, Cylinder Heads, and Connecting Rods.
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