Abnormal noise of wheel loader and forklift diesel engine——Crankshaft bearing noise

Crankshaft Bearing Noise in Wheel Loaders and Forklifts

Understanding the Issue

Crankshaft bearing noise is a serious issue that can lead to significant engine damage if left unchecked. It occurs when the crankshaft bearings, which support the crankshaft and transfer power to the connecting rods, become worn or damaged.

Identifying the Symptoms

1. Dull Sound: The sound is typically a dull thudding or knocking noise.
2. Sudden Acceleration and Deceleration: The noise is more pronounced during sudden changes in engine speed.
3. Engine Vibration: Severe bearing damage can cause noticeable engine vibration.
4. Cylinder-Breaking Method: Isolating individual cylinders may not significantly reduce the noise.
5. Reduced Oil Pressure: Low oil pressure can indicate bearing clearance issues.

Causes and Solutions:

• Wear and Tear: Over time, crankshaft bearings can wear due to friction and load.
• Contamination: Contaminants such as dirt, debris, or metal particles can damage bearing surfaces.
• Misalignment: Misalignment of the crankshaft can cause uneven wear and stress on the bearings.

Preventive Measures:

• Regular Oil Changes: Adhere to the manufacturer's recommended oil change intervals to maintain clean and lubricated engine components.
• High-Quality Oil Filters: Use high-quality oil filters to remove contaminants from the oil.
• Avoid Overloading: Excessive loads can stress engine components and accelerate wear.
• Proper Maintenance: Follow the manufacturer's recommended maintenance schedule, including inspections, adjustments, and repairs.

By understanding the causes and symptoms of crankshaft bearing noise, you can take proactive steps to prevent serious engine damage and costly repairs.