Diesel generator faults mainly involve the diesel engine and the alternator. Below is a summary of common diesel engine faults and their solutions:
| Fault | Possible Cause | Solution |
|---|---|---|
| Engine won't start | Starter motor speed too low | Check starter system; ensure speed ≥110 r/min |
| Engine won't start | Air in fuel system | Check fuel line connections, bleed air, and pump fuel manually until free of bubbles |
| Engine won't start | Blocked fuel line | Inspect and clear fuel lines |
| Engine won't start | Clogged fuel filter | Replace filter element |
| Engine won't start | Fuel pump not supplying or intermittent | Check for leaks in the suction line; clean pump filter |
| Engine won't start | Insufficient or low-pressure fuel injection | Check injector atomization; inspect plunger and delivery valve; adjust injection pressure |
| Engine won't start | Starter system failure, wiring errors, or weak battery | Check wiring; recharge/replace battery; repair or replace starter brushes; clean commutator |
| Engine won't start | Low compression (worn piston rings, valve leakage) | Replace piston rings/cylinder sleeves; adjust valve clearance; check and grind valve seat if sealing is poor |
| Engine won’t start | Loose, dirty, or corroded fuel shutoff solenoid | Tighten, clean, or replace solenoid |
| Engine won’t start | Low solenoid coil voltage or incorrect fuel timing | Ensure voltage ≥9V; adjust timing; repair or replace coil if needed |
Key Takeaways
1. Starting issues are the most common – always check the starter, fuel system, fuel filter, and battery first.
2. Fuel system problems are diverse – air, blockages, and injection issues can prevent startup.
3. Mechanical wear and compression loss – piston rings, valves, and cylinder sleeves require timely maintenance.
4. Electrical and solenoid issues – loose connections or insufficient voltage can prevent fuel delivery and engine startup.
For reliable diesel generator solutions and technical support, contact VOLTGENT: info@voltgent.com
