Cummins LT10 Troubleshooting
| Engine Model: Cummins LT10 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 610 cu.in (10 L) |
| Rated Engine Power: 200-300 Hp (149-224 kW) at 2000 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts up hard or doesn't start |
Fuel filter plugging - Change filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are damaged - Clean or replace injection nozzles.
Fuel injection pump is damaged - Replace injection pump or repair it.
Valve timing is improper - Correct or change timing gear.
Fuel pipes clogging - Clean fuel pipes.
Improper injection timing - Adjust injection timing as required.
Piston rings and cylinder are worn - Change defective components.
| Diesel starts but immediately stops |
Fuel filter plugging - Service or replace the filter.
Fuel injection pump is faulty - Replacement or repair required.
Dirty air filter - Clean or replace element.
Improper nozzle opening pressure - Adjust according to specifications.
| Engine stalls while running |
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Fuel filter element is dirty - Change filter element.
Coolant temperature is low - Warm up engine as required.
Injection nozzles are stuck or clogged - Repair or change injection nozzles.
Low idle speed adjustment is incorrect - Adjust low idle speed.
Valve clearance is not correct - Have it adjusted.
Fuel injection pump damage - Replacement or repair required.
Fuel injection nozzles fault - Replace injection nozzles.
Fuel hoses or lines clogging - Service fuel lines and hoses.
Clogged air filter - Clean or change.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Injection timing is incorrect - Check injection timing adjustment.
Fuel injection pump is damaged - Rebuild or replace pump.
One of moving engine components has failed - Replace or repair damaged components.
Damaged radiator cap or dirty radiator core - Clean radiator or replace cap.
Not enough coolant - Add coolant and check the components of cooling system.
Loose or defective fan belt - Install new fan belt.
Insufficient engine oil - Add oil to the engine crankcase.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Injection timing is out of adjustment - Check injection timing adjustment.
Engine oil insufficient - Check oil level and add oil as required.
Oil pump is damaged - Check and replace if necessary.
Clogged oil filter element - Change or service engine oil filter.
Worn or dirty relief valve - Change or clean relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Diesel engine using too much oil |
External oil leaks: Defective seals or gaskets - Replace defective parts.
Improper oil viscosity - Use oil of correct viscosity.
Piston rings are stuck or broken - Have piston rings replaced.
Valve guides or stems are damaged - Need to replace the valves.
Cylinder liners or pistons are scored - Check pistons and liners, replace as required.
| Abnormal engine knocking or noise |
Low coolant temperature - Engine is not warmed up to the required temperature.
Insufficient engine oil - Check oil level and add oil as required.
Wrong setting of fuel injection pump timing - Adjust fuel injection pump as required.
Worn or scored pistons - Have pistons replaced.
Connecting rod is worn or misaligned - Alignment procedure or replacement is required.
Battery power is low - Charge the battery.
Battery is draining quickly - Service battery or replace it.
Bad terminals or disconnected battery cables - Check wire connections and change or service terminals.
Battery is discharged or worn - Replace or charge as required.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery voltage - Low battery charging, charge as required.
Starter motor failure - Starter should be changed.
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