Cummins M11 Troubleshooting
| Engine Model: Cummins M11 |
| Engine Type: 4-cycle inline 6-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 661 cu.in (10.8 L) |
| Rated Engine Power: 220-400 Hp (164-298 kW) at 2000 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts hard or won't start |
Clogged fuel filter - Change filter element.
Air in fuel system - Bleed fuel system.
Defective or clogged injection nozzle - Inspect nozzles and replace if necessary.
Fuel injection pump is not working correctly - Replace or repair injection pump.
Improper valve timing - Correct or replace timing gear.
Restricted fuel pipes - Clean or change fuel pipes.
Unadjusted injection timing - Set the injection timing correctly.
Excessive wear of piston rings and cylinder - Replace defective parts.
| Diesel starts but immediately stops |
Fuel filter plugged - Clean or replace the filter.
Fuel injection pump failure - Repair or change injection pump.
Plugged air cleaner - Install new air filter element.
Nozzle opening pressure is not adjusted - Adjust as recommended.
| Diesel shuts off while driving |
Incorrect adjustment of fuel injection pump timing - Set the fuel pump timing correctly.
Clogged fuel filter - Change filter element.
Low coolant temperature - Engine is not warmed up to the required temperature.
Injection nozzles are burnt or jammed - Clean or change injection nozzles.
| Engine stops while idling |
Low idle speed set incorrectly - Test and adjust.
The valve clearance is not adjusted - Need to adjust valve clearance.
Defective fuel injection pump - Repair or install new pump.
Fuel injection nozzles are faulty or clogged - Check injection nozzles and replace if required.
Fuel hoses or lines are clogged - Clean fuel hoses and lines.
Air filter plugged - Service or replace the air filter.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Injection timing is improper - Check injection timing adjustment.
Fuel injection pump failure - Change or repair the pump.
Any of moving engine parts is worn - Replace or repair damaged components.
Radiator core is dirty or radiator cap is damaged - Install new cap or clean radiator.
Low engine coolant - Fill the cooling system and check components for leaks or other faults.
Fan belt is worn or faulty - The fan belt needs to be replaced.
Not enough engine oil - Need to add engine oil.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Injection timing is improper - Use correct injection timing adjustment.
Low crankcase oil level - Checking oil level and add if necessary.
Oil pump failure - Replace as required.
Oil filter is clogged - Service or change engine oil filter element.
Stuck or worn relief valve - Change or service relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Engine using too much oil |
Oil leakage: Damaged gaskets or seals - Replace worn parts to avoid leaks.
Oil viscosity is incorrect - Use oil of proper viscosity.
Stuck or defective piston rings - Piston rings replacement required.
Valve guides or stems are damaged - Need to replace the valves.
Scored pistons or cylinder liners - Check pistons and liners, replace as required.
| Engine knocking sound or abnormal noise |
Engine is not preheated - Normalize the temperature by warming up the engine.
Lack of engine oil - Check and refill engine oil.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Pistons are worn or broken - Have pistons replaced.
Connecting rod is misaligned or worn - Need to align or replace the connecting rod.
Battery power is low - Battery is drained, charge it.
Battery is not holding charge - Service or change the battery.
Corroded battery terminals or disconnected wires - Check cables and clean or change terminals.
Battery is low or faulty - Change or recharge battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery capacity - Battery is drained, recharge it.
Starter motor failing - Repair or change starter.
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