Addressing White Smoke Issues in Wheeled Excavators

In theory, a wheeled excavator's diesel engine should emit colorless, transparent exhaust gas when in good technical condition. Any deviation from this signals engine irregularities, with white smoke being a common anomaly. This article analyzes the causes of white smoke emission in wheeled excavators and provides solutions.

Causes Analysis

1.Low Operating Temperature:

Cause: In cold environments, insufficient temperatures hinder proper fuel combustion.
Solution: Initiate cold-start procedures, including preheating, to raise the engine temperature.

2.Delayed Fuel Injection:

Cause: Late fuel injection timing can lead to poor combustion.
Solution: Adjust the fuel injection timing for optimal combustion.

3.Compression Issues:

Cause: Poor compression due to leaks results in inadequate temperatures for combustion.
Solution: Inspect and repair seals or components causing compression leaks.

4.Poor Diesel Atomization:

Cause: Inadequate atomization of diesel in the cylinders results in incomplete combustion.
Solution: Check and adjust injectors or consider replacement.

5.Presence of Water in Cylinders:

Cause: Water entering the cylinders due to seal issues or water content in fuel.
Solution: Investigate and address issues causing water ingress.

Diagnosis and Resolution

1. Check Water Temperature: If the water temperature is too low and white smoke is emitted, implement low-temperature startup methods (preheating).

2. Adjust Fuel Injection Timing: If the engine exhibits weakness, high temperatures, and emits white smoke, adjust the fuel injection timing.

3. Compression Analysis: If the engine struggles to start, emits white smoke, and shows power loss with unusual sounds, address compression issues as needed.

4. Water Presence Check: Direct exhaust gases onto the palm and check for water droplets. Water presence indicates water or coolant leaks, requiring further investigation.

5. Injector Testing: If all parameters are normal, conduct injector tests. If poor atomization is evident, adjust or replace injectors.

Regular engine maintenance not only enhances equipment performance but also extends engine life, ultimately reducing overall excavator operating costs.

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