Fault Phenomenon: SANY SY5500THB exhaust is normal when cold. During high-load operation (operating temperature), the exhaust pipe glows red, power drops, and there is a fire risk.

Troubleshooting Process:
– Checked injection timing: timing correct.
– Checked intake system: intake unobstructed.
– Checked engine load: load normal.
– Measured exhaust temperature at operating temperature: found abnormally high temperature.

Root Cause: Poor injector atomization causes afterburning, leading to excessively high exhaust temperature.

Required Parts: Injector assembly and calibration.