Perkins Unburnt Fuel / Low Combustion Temperature

Excessive white smoke from exhaust, especially on startup

Safety Warning

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

Low compression in cylinders, Faulty injectors with poor spray pattern, Cold engine with faulty pre‑heat system (if fitted), Incorrect fuel grade or water in fuel

How to Fix / Troubleshooting

Safety: Avoid prolonged operation with heavy white smoke; unburnt fuel can wash cylinder walls.

Fuel quality: Drain water from the fuel/water separator and ensure clean diesel is used.
Pre‑heat system: If the Perkins engine uses glow plugs or intake heaters, test their operation and replace failed elements or relays.
Injector check: Have injectors bench‑tested for spray pattern and leakage.
Compression test: If smoke persists, a compression test may be required to assess engine wear.

Repair Difficulty

Hard 4/5

Required Part

Glow Plug (if fitted)

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