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Black smoke, oil consumption, hard starting or rising coolant temperature are early warnings. Spotting them in time avoids major damage and overhaul costs.
Diesel engines on generators, tractor units and reach stackers work hard and long. Rather than waiting for a breakdown, watch for these five signs.
1. Abnormal exhaust smoke
- Black smoke: too much fuel or too little air – clogged air filter, worn injectors, weak turbo.
- Blue smoke: burning oil – rings, valve guides or turbo seals.
- Persistent white smoke: coolant in the cylinders or incomplete combustion.
2. Oil consumption, low oil pressure
Frequent top-ups or a flickering oil-pressure light point to worn bearings, a weak oil pump or leaks. Check before the bearings fail.
3. Hard starting, rough running
Usual causes: dirty fuel filters, air in the fuel system, poor injectors, weak batteries or starter. On standby generators this is critical – the set may not start when needed.
4. High coolant temperature
A dirty radiator, slack belt, failed water pump or thermostat all cause overheating, which can warp the cylinder head or seize the engine.
5. Knocking or unusual vibration
Metallic knocks, growing vibration or turbo whine need an engineer’s check. Don’t keep running an engine that sounds wrong.
Service on schedule
Change oil and filters by running hours and inspect belts, radiator and batteries regularly. TTT supplies genuine and equivalent engine parts for Cummins, Caterpillar, Perkins and more, plus on-site servicing.
Need advice or a quote? Send the part number or a photo of the nameplate through our quote form or call 0909 580 181 – TTT engineers reply within the working day.
