Cummins QSZ13-G3 Troubleshooting
| Engine Model: Cummins QSZ13-G3 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 793 cu.in (13 L) |
| Rated Engine Power: 513-670 Hp (383-500 kW) at 1500-1800 rpm |
| Fuel System Type: Xtra-High Pressure Injection |
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| Engine starts up hard or won't start |
Fuel filter plugged - Clean or change the filter.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Fuel injection pump is damaged - Change pump or rebuild it.
Unadjusted valve timing - Adjust or replace timing gear.
Restricted fuel pipes - Service fuel pipes.
Injection timing is wrong - Adjust injection timing as required.
Piston rings and cylinder are worn - Change defective parts.
| Engine starts and stops suddenly |
Fuel filter plugged - Change filter element.
Faulty fuel injection pump - Repair or replace injection pump.
Plugged air filter - Install new air filter element.
Improper nozzle opening pressure - Set up as recommended.
| Engine shuts off suddenly during operation |
Wrong setting of fuel injection pump timing - Adjust fuel injection pump as required.
Clogged fuel filter - Service the filter.
Engine is not preheated - Warm up engine as required.
Injection nozzles sticking or clogged - Check injection nozzles and replace if required.
| Engine stops while idling |
Too low idle RPM - Adjustment required.
The valve clearance is incorrect - Adjust to proper valve clearance.
Fuel injection pump is broken - Install a new pump or rebuild.
| Engine power is insufficient |
Clogged or burnt injection nozzle - Clean or replace injection nozzles.
Fuel hoses or lines are dirty - Clean fuel lines and hoses.
Dirty air filter element - Service air cleaner.
Cylinder head gasket is blown - Replace the gasket as required.
Incorrect injection timing - Use correct injection timing adjustment.
Faulty fuel injection pump - Rebuild or change fuel pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Radiator fins are dirty or radiator cap is defective - Clean radiator or change cap.
Low coolant level - Add coolant fluid to cooling system and also check it for leaks.
Loose or damaged fan belt - Fan belt must be replaced.
Insufficient engine oil - Check and refill engine oil.
Cylinder head gasket is worn - Change cylinder head gasket.
Improper injection timing - Adjust according to specifications.
| Insufficient oil pressure |
Lack of oil - Add oil to the engine crankcase.
Worn oil pump - Install a new pump.
Oil filter element clogged - Change or clean engine oil filter element.
Stuck or worn relief valve - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
| High engine oil consumption |
Oil leaking: Worn gaskets or seals - Install new components.
Incorrect oil viscosity - Use oil of correct viscosity.
Piston rings are stuck or broken - Change piston rings.
Damaged valve guides or valve stems - Valves need to be changed.
Worn pistons or cylinder liners - Inspect pistons and liners, change as required.
| Engine knocking sound or abnormal noise |
Engine is cold - Engine is not warmed up to the required temperature.
Insufficient engine oil - Fill up the oil to required level.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Worn or scored pistons - Replace the pistons as required.
Connecting rod is not aligned or defective - Replace or align connecting rod.
Battery capacity is low - Battery is drained, charge it.
Battery will not hold charge - Service charging system or replace battery.
Wires are disconnected or battery terminals are corroded - Check wire connections and change or service terminals.
Battery is drained or defective - Replace or charge as required.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery capacity is low - Recharge the battery.
Starter motor is defective - Replace or repair starter.
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