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Brand Name
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Cummins, Detroit, DCEC, CCEC, XCEC etc.
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Other parts
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pls contact freely if you need other P/N
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Engine Type
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Diesel engine, Gas engine, Diesel Generator, Marine engine, Construction engine Pump engine etc.
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Spare Type
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Wearing spare parts, maintenance tools, repair kit, upper and lower engine gasket kit.
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Delivery time:
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Most parts are in stock, bulk order based on qty
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Payment
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T/T, L/C, D/A, Alipay, Western Union, Paypal etc.
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About the product
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The connecting rod bearings of Cummins 4BT and 6BT diesel engines mainly include the following types:
Connecting rod bearing: Connecting rod bearings suitable for Cummins 4BT and 6BT engines, made of 20 high-tin, copper-lead alloy and electroplated ternary, with product classifications including +0.00, +0.03, +0.25, +0.50 and +0.75 and other multiple specifications. one.
Connecting rod bearing: The connecting rod bearing is also an important accessory for Cummins 4BT and 6BT engines. The specific model and specification can be selected according to actual needs. one.
Thrust pads: Thrust pads are also one of the key components of an engine and are suitable for Cummins 4BT and 6BT engines. one.
These connecting rod bearings play a role in supporting and reducing friction in the engine, ensuring its normal operation and extending its service life.
1. **Function and Structure of Bearings**
- **Function**: The connecting rod bearing, commonly referred to as the "small bearing," serves as a critical component that connects the connecting rod to the crankshaft. It is responsible for transmitting combustion pressure and converting it into rotational motion. To ensure reliable performance under high-stress conditions, the bearing must exhibit excellent wear resistance and fatigue resistance.
- **Material**: Typically constructed with a steel backing coated in either high-tin aluminum alloy or copper-lead alloy, these bearings may also feature a polymer coating (e.g., PTFE) on their surface to minimize friction and enhance durability.
2. **Bearing Models and Specifications**
- The specifications for connecting rod bearings used in Cummins 4BT (3.9L four-cylinder) and 6BT (5.9L six-cylinder) engines are similar but require precise verification based on the engine's serial number to ensure compatibility.
- **Standard Size**: The standard coating thickness typically ranges from 0.002 to 0.003 inches (approximately 0.05 to 0.08 mm).
- **Repair Size**: For crankshaft repairs, oversized bearings with an additional thickness of 0.001 inches (approximately 0.025 mm) are available, such as +0.25 mm, +0.50 mm, etc., to restore proper clearances.
3. **Common Faults and Replacement Procedures**
- **Fault Phenomena**: Common issues include reduced oil pressure (caused by excessive bearing clearance), unusual noises during sudden acceleration (often described as a "tapping" sound), and clogged oil filters due to metal debris resulting from bearing spalling.
- **Replacement Key Points**: When replacing bearings, the connecting rod must be disassembled, and the wear on the crankshaft journal should be measured using appropriate tools. Based on the measurements, select the corresponding repair-size bearing to ensure optimal fitment. During installation, use a calibrated torque wrench to tighten the connecting rod bolts according to the manufacturer's specifications (e.g., for 6BT engines, the recommended torque is 50–60 lbf·ft, followed by an additional 90° rotation).
4. **Original Equipment Manufacturer (OEM) Parts**
- Original factory parts are essential for maintaining engine reliability. Common part numbers for Cummins connecting rod bearings include 3905354 and 3963307; however, it is crucial to verify the specific model requirements to ensure compatibility.
5. **Maintenance Recommendations**
- **Engine Oil Selection**: Use high-quality diesel engine oil rated at CI-4 or CJ-4 grade, specifically 15W-40, and adhere to a regular maintenance schedule (recommended every 250 operating hours or 10,000 kilometers). Proper lubrication is vital for extending bearing life and preventing premature wear.
- **Clearance Check**: The recommended clearance for connecting rod bearings is typically between 0.002 and 0.003 inches (0.05 to 0.08 mm). This clearance should be verified using a plastic feeler gauge during routine inspections.
- **Additional Notes**: When replacing bearings, it is advisable to inspect both the crankshaft and connecting rods for signs of wear or damage. Ensuring proper alignment and roundness of the crankshaft journal will prevent rapid wear of the new bearings. Additionally, always use OEM or certified third-party bearings to avoid severe failures such as bearing seizure or shaft locking caused by substandard components.
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