Cummins QSF2.8 Troubleshooting
| Engine Model: Cummins QSF2.8 |
| Engine Type: 4-cycle inline 4-cylinder common-rail direct injection liquid-cooled diesel |
| Total Displacement: 171 cu.in (2.8 L) |
| Rated Engine Power: 50-74 Hp (37-55 kW) at 2800 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts hard or won't start |
Dirty fuel filter - Service the filter.
There is air in the fuel system - Bleed the system.
Fuel injection nozzles are damaged or dirty - Inspect nozzles and replace if necessary.
Fuel injection pump is not operating properly - Change or repair the pump.
Valve timing is out of adjustment - Adjust or change timing gear.
Fuel pipes are dirty - Service fuel pipes.
Injection timing is improper - Adjust according to specifications.
Worn cylinder or piston rings - Replace faulty parts.
| Diesel starts but then stops |
Fuel filter plugged - Replace filter element.
Fuel injection pump is faulty - Replace injection pump or repair it.
Dirty air cleaner - Carry out maintenance on air filter.
Nozzle opening pressure is incorrect - Set up as recommended.
| Engine stops running suddenly |
Incorrect adjustment of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Fuel filter element is clogged - Replace the filter element.
Engine is not warmed up to the required temperature - Warm up to required temperature.
Defective or stuck injection nozzles - Clean or replace injection nozzles.
Incorrectly adjusted low idle speed - Adjustment required.
Valve clearance is not correct - Adjust valve clearance.
Fuel injection pump is not working correctly - Repair or install new pump.
| Engine is not running at maximum power |
Clogged or defective injection nozzles - Inspect nozzles and replace if necessary.
Fuel hoses or lines clogging - Clean fuel hoses and lines.
Plugged air cleaner - Replace air filter element.
Blown cylinder head gasket - Change cylinder head gasket.
Incorrect injection timing - Adjust injection timing as required.
Fuel injection pump is defective - Repair or replace injection pump.
Any of moving engine components is faulty - Change or repair damaged parts.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or replace cap.
Coolant level is low - Add coolant fluid and inspect the cooling system for leaks.
Damaged or worn fan belt - Install new fan belt.
Engine oil level low - Add oil to the engine crankcase.
Cylinder head gasket is damaged - Gasket should be replaced.
Injection timing is improper - Use correct injection timing adjustment.
Lack of oil - Need to add oil.
Worn oil pump - Repair or change.
Oil filter is clogged - Clean or change engine oil filter.
Relief valve is defective or dirty - Change or service relief valve.
Crankshaft bearing clearance is excessive - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty parts.
| Engine consuming too much oil |
Oil leakage: Defective seals or gaskets - Replace defective parts.
Incorrect oil viscosity - Fill up with the correct oil viscosity.
Piston rings are defective or worn - Piston rings replacement required.
Damaged valve stems or valve guides - Valves must be replaced.
Cylinder liners or pistons are damaged - Inspect liners and pistons, fit new parts as necessary.
| Engine knocking sound or abnormal noise |
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Lack of engine oil - Add oil to the engine crankcase.
Fuel injection pump timing is wrong - Check the fuel injection pump timing adjustment.
Broken or worn pistons - Pistons replacement required.
Misaligned or faulty connecting rod - Alignment procedure or replacement is required.
| Starter motor cranks slow |
Low battery output voltage - Charge the battery.
Battery discharges quickly - Service charging system or install new battery.
Disconnected wiring or bad battery terminals - Connect wires properly or change terminals.
Battery is low or faulty - Replace or charge as required.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output voltage - Recharge the battery.
Starter motor is faulty - Change or repair starter.
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