Cummins QSX15-G8 Troubleshooting
| Engine Model: Cummins QSX15-G8 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 912 cu.in (15 L) |
| Rated Engine Power: 540-671 Hp (403-500 kW) at 1500-1800 rpm |
| Fuel System Type: High Pressure Injection |
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| Engine starts up hard or doesn't start |
Fuel filter plugging - Replace filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are faulty or clogged - Replace injection nozzles.
Faulty fuel injection pump - Repair or change injection pump.
Unadjusted valve timing - Set the valve timing correctly.
Clogged fuel pipes - Clean or change fuel pipes.
Unadjusted injection timing - Use correct injection timing adjustment.
Piston rings and cylinder are worn - Replace defective parts.
| Diesel starts but then stops |
Fuel filter element clogging - Filter maintenance required.
Fuel injection pump is damaged - Rebuild or change fuel pump.
Plugged air filter - Carry out maintenance on air filter.
Nozzle opening pressure is not adjusted - Adjust as recommended.
| Engine stalls while running |
Fuel injection timing is wrong - Set it up as required.
Fuel filter plugging - Clean the filter element.
Engine is not preheated - Warm up the engine.
Injection nozzles are burnt or jammed - Clean or change injection nozzles.
Low idle speed set incorrectly - Correct low idle adjustment.
The valve clearance is incorrect - Correct valve clearance.
Fuel injection pump damage - Replacement or repair required.
Clogged or defective injection nozzles - Clean or change injection nozzles.
Dirty fuel hoses or lines - Service fuel hoses and lines.
Plugged air filter - Clean or change the filter.
Damaged cylinder-head gasket - Replace the gasket as required.
Injection timing is improper - Adjust injection timing as required.
Fuel injection pump is broken - Change pump or rebuild it.
One of moving engine parts is faulty - Change or repair damaged parts.
Damaged radiator cap or dirty radiator core - Change cap or clean radiator.
Insufficient coolant - Add coolant and check the components of cooling system.
Damaged or worn fan belt - If necessary, replace the belt.
Engine oil level low - Add oil to the engine crankcase.
Cylinder head gasket is worn - Replace cylinder head gasket.
Injection timing is out of adjustment - Adjust as recommended.
Not enough oil in the engine - Fill the crankcase with oil.
Oil pump is defective - Repair or change.
Oil filter clogging - Change or service engine oil filter.
Relief valve is stuck or worn - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty parts.
Oil leakage: Defective seals or gaskets - To repair leaks, replace worn parts.
Improper oil viscosity - Use oil of proper viscosity.
Piston rings are defective or worn - Change piston rings.
Worn valve stems and valve guides - Install new valves.
Pistons or cylinder liners are worn - Inspect liners and pistons, replace as necessary.
Engine not warmed up - Normalize the temperature by warming up the engine.
Insufficient engine oil - Check oil level and add oil as required.
Improper setting of fuel injection pump timing - Adjust as recommended.
Worn or broken pistons - Pistons need to be replaced.
Connecting rod misalignment or failure - Connecting rod must be aligned or replaced.
Battery power is low - Battery is drained, charge it.
Battery does not hold charge - Service or change the battery.
Faulty battery terminals or disconnected cables - Connect cables correctly or replace terminals.
Battery is discharged or defective - Charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery power - Battery is drained, charge it.
Starter motor failing - Change or repair starter.
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