Cummins QSM11 Troubleshooting
| Engine Model: Cummins QSM11 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 661 cu.in (10.8 L) |
| Rated Engine Power: 290-715 Hp (216-533 kW) at 2100-2500 rpm |
| Fuel System Type: Celect Electronic Unit Injection |
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| Engine starts up hard or doesn't start |
Fuel filter element is dirty - Change filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles fault - Check injection nozzles and replace if required.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.
Incorrect valve timing - Correct or replace timing gear.
Fuel pipes are dirty - Clean or replace fuel pipes.
Injection timing is wrong - Set up as recommended.
Worn piston rings and cylinder - Change defective parts.
| Diesel starts but stalls suddenly |
Fuel filter element is dirty - Replace filter element.
Defective fuel injection pump - Change pump or rebuild it.
Air filter is clogged - Service or replace the air filter.
Nozzle opening pressure is not adjusted - Set up as recommended.
| Engine stalls after running |
Timing of fuel injection pump is incorrect - Set it up as required.
Fuel filter element is dirty - Filter maintenance required.
Engine not warmed up - Warm up engine as required.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
Too low idle RPM - Need to adjust idle speed.
Valve out of adjustment - Correct valve clearance.
Fuel injection pump malfunctioning - Repair or replace injection pump.
Clogged injection nozzle - Clean or replace injection nozzles.
Clogged fuel lines or hoses - Clean fuel lines and hoses.
Intake air restriction - Service air cleaner.
Defective cylinder head gasket - Replace the gasket as required.
Injection timing is wrong - Use correct injection timing adjustment.
Fuel injection pump failure - Replace injection pump or repair it.
One of moving engine components has failed - Repair or replace defective components.
Clogged radiator core or damaged radiator cap - Install new cap or clean radiator.
Insufficient coolant - Top up coolant fluid and check system for leaks.
Fan belt is worn or faulty - The fan belt needs to be replaced.
Engine oil level low - Fill up the engine oil.
Cylinder head gasket is blown - Change cylinder head gasket.
Injection timing is improper - Use correct injection timing adjustment.
| Oil pressure is insufficient |
Engine oil insufficient - Fill the crankcase with oil.
Oil pump is damaged - Repair or change.
Plugged engine oil filter - Change or clean engine oil filter element.
Relief valve is seized or worn - Change or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and change or repair worn components.
Excessive oil clearance of crankpin bearing - Test and replace or repair worn components.
| Diesel engine using too much oil |
Oil leaks: Damaged gaskets or seals - Replace to repair leaks.
Oil viscosity is wrong - Fill up with the proper oil viscosity.
Stuck or worn piston rings - Install new piston rings.
Valve guides and stems are worn - Valves must be replaced.
Worn cylinder liners or pistons - Check liners and pistons, replace as required.
| Engine knocking sound or abnormal noise |
Engine is not fully warmed up - Warm up engine as required.
Engine oil insufficient - Fill up the oil to required level.
Fuel injection pump timing is not adjusted - Set the fuel pump timing correctly.
Worn or broken pistons - Pistons replacement required.
Connecting rod is defective or not aligned - Need to align or replace the connecting rod.
Low battery power - Battery needs to be recharged.
Battery is not holding charge - Service charging system or change battery.
Battery cables are disconnected or terminals are faulty - Check cables and service or change terminals.
Battery is low or faulty - Charge or change the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output voltage - Charge the battery.
Starter motor is damaged - Repair or replace starter.
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