Cummins ISB6.7E5 Troubleshooting
| Engine Model: Cummins ISB6.7E5 |
| Engine Type: 4-cycle inline 6-cylinder common-rail direct injection liquid-cooled diesel |
| Total Displacement: 409 cu.in (6.7 L) |
| Rated Engine Power: 197-273 Hp (147-204 kW) at 2300 rpm |
| Aspiration Type: Turbocharged and aftercooled |
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| Engine hard to start or doesn't start |
Clogged fuel filter - Install new filter element.
Air in the fuel lines - Bleed the fuel lines.
Damaged or dirty injection nozzles - Check injection nozzles and replace if required.
Fuel injection pump malfunctioning - Replace injection pump or repair it.
Wrong valve timing - Adjust or change timing gear.
Restricted fuel pipes - Service fuel pipes.
Wrong injection timing - Adjust according to specifications.
Piston rings and cylinder are worn - Change defective parts.
| Engine starts and stalls suddenly |
Fuel filter element is clogged - Change filter element.
Fuel injection pump is faulty - Install a new pump or rebuild.
Clogged air filter - Replace air filter element.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine stalls after running |
Improper setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Fuel filter element clogging - Clean or change the filter.
Coolant temperature is low - Warm up engine as required.
Defective or stuck injection nozzles - Clean or change injection nozzles.
| Engine stalls at low idle speed |
Incorrectly set low idle speed - Adjust low idling as recommended.
Improper valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump failure - Install a new pump or rebuild.
| Engine power is insufficient |
Fuel injection nozzles are dirty or defective - Clean or change injection nozzles.
Fuel hoses or lines clogging - Fuel hoses and lines must be clean.
Restricted intake air - Replace air filter element.
Cylinder-head gasket is leaking - Change cylinder head gasket.
Injection timing is incorrect - Adjust injection timing as required.
Fuel injection pump malfunctioning - Rebuild or replace pump.
One of moving engine parts is faulty - Replace or repair damaged components.
Clogged radiator fins or leaking radiator cap - Replace cap or clean radiator.
Lack of engine coolant - Refill to the correct level and inspect system for leaks.
Loose or defective fan belt - Belt change is required.
Not enough engine oil - Check and refill engine oil.
Cylinder-head gasket is leaking - Install a new gasket.
Injection timing is improper - Adjust injection timing as required.
Lack of oil - Fill the crankcase with oil.
Worn oil pump - Repair or change.
Oil filter is clogged - Service or replace engine oil filter.
Relief valve is seized or worn - Relief valve need to be replaced or cleaned.
Crankshaft bearing clearance is excessive - Check and change or repair defective parts.
Crankpin bearing clearance is excessive - Check and change or repair defective parts.
| Engine oil consumption is too high |
Oil leakage: Worn gaskets or seals - Install new components.
Oil viscosity is incorrect - Use oil of correct viscosity.
Piston rings are defective or worn - Have piston rings replaced.
Damaged valve stems or valve guides - Replace defective valves.
Pistons or cylinder liners are scuffed - Check liners and pistons, change as required.
| Engine knocking sound or abnormal noise |
Engine has not warmed up to the recommended temperature - Warm up the engine.
Engine oil level is insufficient - Fill up the oil to required level.
Timing of fuel injection pump is incorrect - Check the fuel injection pump timing adjustment.
Worn or scored pistons - Pistons replacement required.
Faulty or misaligned connecting rod - Align or change connecting rod.
Low battery power - Charge the battery.
Battery will not hold charge - Service charging system or change battery.
Disconnected wires or corroded battery terminals - Connect wiring properly or install new terminals.
Battery is drained or worn - Change or recharge battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery power is low - Battery is drained, recharge it.
Starter motor is damaged - Starter should be changed.
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