Cummins ISB6.7 Troubleshooting
| Engine Model: Cummins ISB6.7 |
| Engine Type: 4-cycle inline 6-cylinder HPCR direct injection liquid-cooled diesel |
| Total Displacement: 409 cu.in (6.7 L) |
| Rated Engine Power: 197-320 Hp (147-239 kW) at 2300 rpm |
| Aspiration Type: Turbocharged |
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| Engine hard to start or won't start |
Fuel filter element clogging - Replace filter element.
Air in fuel system - Bleed fuel system.
Dirty or damaged injection nozzles - Check injection nozzles and replace if required.
Fuel injection pump is not operating properly - Rebuild or change fuel pump.
Valve timing is wrong - Adjust or change timing gear.
Plugged fuel pipes - Clean or change fuel pipes.
Wrong injection timing - Adjust injection timing as required.
Excessive wear of piston rings and cylinder - Replace faulty parts.
| Engine starts and then shuts off |
Fuel filter element clogging - Clean the filter element.
Fuel injection pump failure - Replace or rebuild injection pump.
Clogged air filter - Air filter maintenance required.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine stalls while running |
Fuel injection timing is wrong - Use the correct fuel injection pump timing adjustment.
Fuel filter element is dirty - Change filter element.
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Clean or replace injection nozzles.
Low idle speed setting is incorrect - Adjust the low idle speed.
Valve out of adjustment - Adjustment procedure required.
Fuel injection pump failure - Replace or rebuild injection pump.
Faulty or dirty injection nozzles - Check and replace nozzles if required.
Dirt in the fuel lines or hoses - Clean fuel lines and hoses.
Air filter is dirty - Clean or replace the element.
Cylinder head gasket is damaged - Change cylinder head gasket.
Wrong injection timing - Adjust injection timing as required.
Fuel injection pump failure - Repair or replace injection pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Dirty radiator core or faulty radiator cap - Install new cap or clean radiator.
Low engine coolant - The cooling system needs to be refilled and checked for faults.
Fan belt is loose or defective - Change the fan belt.
Not enough engine oil - Add oil to the engine crankcase.
Cylinder-head gasket is broken - Cylinder-head gasket replacement required.
Improper injection timing - Adjust as recommended.
Low oil level - Fill the crankcase with oil.
Oil pump is defective - Repair or replace.
Oil filter clogging - Replace or service engine oil filter.
Worn or dirty relief valve - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Check and change or repair defective parts.
Excessive oil clearance of crankpin bearing - Inspect and replace or repair faulty parts.
| Engine oil consumption is too high |
External oil leaks: Seals or gaskets are wearing excessively - To repair leaks, replace worn parts.
Wrong oil viscosity - Use oil of correct viscosity.
Piston rings are stuck or broken - Replace piston rings.
Worn valve stems and valve guides - Replace defective valves.
Worn cylinder liners or pistons - Check liners and pistons, replace as required.
Engine has not warmed up to the recommended temperature - Warm up to required temperature.
Lack of engine oil - Fill up the engine oil.
Timing of fuel injection pump is incorrect - Adjust the pump as required.
Piston wear or scoring - Replace the pistons as required.
Connecting rod is not aligned or defective - Align or replace connecting rod.
Battery voltage is low - Battery is drained, charge it.
Battery is not holding charge - Service battery or change it.
Wires are disconnected or battery terminals are corroded - Connect cables properly or replace terminals.
Battery is drained or worn - Charge or replace the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Battery capacity is low - Charge the battery.
Faulty starter motor - Change or repair starter.
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