Cummins ISB6.7E6 Troubleshooting
| Engine Model: Cummins ISB6.7E6 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 408 cu.in (6.7 L) |
| Rated Engine Power: 150-325 Hp (112-242 kW) at 2500 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts up hard or doesn't start |
Fuel filter element clogging - Replace filter element.
There is air in the fuel system - Bleed the system.
Fuel injection nozzles fault - Check injection nozzles and replace if required.
Fuel injection pump is defective - Replace injection pump or repair it.
Valve timing is wrong - Adjust or replace timing gear.
Fuel pipes are dirty - Service fuel pipes.
Unadjusted injection timing - Check injection timing adjustment.
Excessive wear of piston rings and cylinder - Change faulty parts.
| Diesel starts but stalls suddenly |
Fuel filter element is clogged - Replace filter element.
Defective fuel injection pump - Replace injection pump or repair it.
Restricted intake air - Clean or replace element.
Improper nozzle opening pressure - Adjust as required.
| Engine stalls after running |
Incorrect adjustment of fuel injection pump timing - Set it up as required.
Fuel filter element clogging - Clean or change the filter.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Injection nozzles are stuck or clogged - Service or change injection nozzles.
Incorrect low idle setting - Test and adjust.
Valve clearance is not correct - Correct valve clearance needs to be set.
Fuel injection pump is damaged - Replace or repair injection pump.
Fuel injection nozzles are clogged or faulty - Change fuel injection nozzles.
Fuel hoses or lines are clogged - Clean fuel system lines and hoses.
Air filter element clogged - Clean or change the filter.
Cylinder head gasket is damaged - Change cylinder head gasket.
Injection timing is improper - Adjust according to specifications.
Fuel injection pump is damaged - Change pump or rebuild it.
Any of moving engine components is faulty - Change or repair damaged parts.
Radiator fins are dirty or radiator cap is defective - Clean radiator or change cap.
Not enough coolant - Add coolant and check the components of cooling system.
Fan belt is loose or defective - Belt change is required.
Low engine oil level - Check and refill engine oil.
Damaged cylinder-head gasket - Cylinder-head gasket replacement required.
Injection timing is improper - Set the injection timing correctly.
| Insufficient oil pressure |
Engine oil insufficient - Check and refill the oil.
Oil pump is defective - Check and replace if necessary.
Dirty oil filter - Change or service engine oil filter.
Relief valve is stuck or worn - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Check and replace or repair defective parts.
Clearance of crankpin bearing is excessive - Check and change or repair defective parts.
| Diesel engine consuming too much oil |
Oil leakage: Gaskets or seals can be faulty - Change to repair leaks.
Oil viscosity is incorrect - Use oil of proper viscosity.
Worn or broken piston rings - Piston rings need to be replaced.
Worn valve stems and valve guides - Install new valves.
Pistons or cylinder liners are damaged - Inspect pistons and liners, replace as required.
Engine has not warmed up to the recommended temperature - Normalize the temperature by warming up the engine.
Insufficient engine oil - Fill up the oil to required level.
Incorrect adjustment of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Broken or worn pistons - Install new pistons.
Connecting rod is misaligned or defective - Align or replace connecting rod.
Battery power is low - Low battery charging, charge as required.
Battery is not holding charge - Service battery or change it.
Disconnected wiring or bad battery terminals - Connect cables correctly or replace terminals.
| Starter motor is not working |
Battery is low or faulty - Battery needs to be recharged or replaced.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery voltage is low - Battery needs to be recharged.
Starter motor is damaged - Starter should be changed.
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