Engine explosions in wood chippers are extremely rare (all engines undergo strict factory inspections) and generally result from improper operation. The main causes are as follows:

1. Fuel-Related Issues (High Probability)

• Fuel leakage ignited by sparks or hot engine components.

• Using improper fuel or contaminated fuel leading to incomplete combustion and accumulation of flammable gases.

• Failure to add engine oil (high probability).

2. Air and Mixture Abnormalities (Not Observed During Factory Testing)

• Air filter clogged or excessively dirty, causing abnormal mixture, which may lead to backfire or self-ignition.

3. Ignition System Problems (Not Observed During Factory Testing)

• Improper spark plug installation or incorrect ignition timing, resulting in detonation or cylinder damage.

4. Mechanical Failures (Not Observed During Factory Testing)

• Crankshaft or flywheel breakage, or severe engine knocking.

5. Overheating (Not Observed During Factory Testing)

• Poor cooling due to prolonged full-load operation or blocked ventilation, causing high temperatures, carbon deposits self-ignition, or engine oil catching fire.

6. External Factors (Extremely Low Probability)

• Presence of open flames or high-temperature objects during operation, such as smoking nearby or welding sparks.

• Wood chipper ingesting hard objects: metal or stones striking the blades, creating sparks that ignite fuel vapors.

Solution:

• Add engine oil and use proper fuel (critical).

• Keep the carburetor, fuel lines, and fuel tank in good condition with no leaks.

• Clean the air filter regularly to ensure proper airflow.

• Check fuel level and oil condition before each operation to prevent overheating.

• Keep the working environment away from open flames.