Abnormal noise of wheel loader and forklift diesel engine——rod noise

Connecting Rod Bearing Noise in Wheel Loaders and Forklifts

Understanding the Issue

Connecting rod bearing noise is another common issue that can affect the performance and longevity of wheel loaders and forklifts. When the connecting rod journal or bearing surfaces wear excessively, it can lead to increased clearance, metal-to-metal contact, and ultimately, engine failure.

Identifying the Symptoms

1. Noise Intensity: The noise is most prominent at medium engine speeds.
2. High-Speed Masking: At high speeds, other mechanical noises may mask the bearing noise.
3. Idle Noise: The noise is less noticeable at idle speed.
4. Temperature Impact: The noise remains relatively constant with temperature changes.
5. Acceleration and Deceleration: The noise intensifies during acceleration and deceleration in the mid-speed range.
6. Cylinder-Breaking Method: Isolating individual cylinders can reduce or eliminate the noise, pinpointing the affected cylinder.

Causes and Solutions:

• Excessive Wear: Wear of the connecting rod journal or bearing surfaces is the primary cause. Regular inspections and timely replacements are crucial.
• Poor Lubrication: Inadequate lubrication can accelerate wear and exacerbate noise. Ensure proper oil levels and quality.
• Misalignment: Misalignment of the connecting rod can cause uneven wear and noise. Proper alignment is essential during assembly and repair.
• Contamination: Contaminants such as dirt, debris, or metal particles can damage bearing surfaces. Use high-quality filters and avoid operating in dusty environments.

Preventive Measures:

• Regular Oil Changes: Adhere to the manufacturer's recommended oil change intervals to maintain clean and lubricated engine components.
• High-Quality 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, symptoms, and preventive measures associated with connecting rod bearing noise, you can take proactive steps to maintain the health and longevity of your wheel loader or forklift engine.