Mitsubishi K4M Troubleshooting
| Engine Model: Mitsubishi K4M |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 121.7 cu.in (1.99 L) |
| Rated Engine Power: 42 Hp (31 kW) at 2400 rpm |
| Fuel System Type: Indirect injection |
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| Engine difficult to start or doesn't start |
Fuel filter element is dirty - Change filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are damaged or dirty - Test injection nozzles and change if necessary.
Fuel injection pump malfunction - Rebuild or install a new injection pump.
Incorrect valve timing - Correct or replace timing gear.
Plugged fuel pipes - Service or change fuel pipes.
Wrong injection timing - Use correct injection timing adjustment.
Piston rings and cylinder are worn - Change faulty parts.
| Diesel starts and suddenly stops |
Fuel filter element is dirty - Filter maintenance required.
Faulty fuel injection pump - Repair or change injection pump.
Dirty air cleaner - Clean or replace element.
Nozzle opening pressure is improper - Adjust as required.
| Engine stops suddenly during operation |
Timing of fuel injection pump is incorrect - Check the fuel injection pump timing adjustment.
Dirty fuel filter - Replace the filter element.
Engine is not warmed up to the required temperature - Warm up engine as required.
Defective or stuck injection nozzles - Clean or replace injection nozzles.
Too low idle RPM - Adjust the low idle speed.
Valve clearance is wrong - Have it adjusted.
Fuel injection pump malfunctioning - Rebuild or replace pump.
| Engine power is insufficient |
Faulty fuel injection nozzles - Install a new kit of correctly balanced nozzles.
Clogged fuel lines or hoses - Clean fuel hoses and lines.
Restricted intake air - Replace air filter element.
Worn cylinder head gasket - Gasket should be replaced.
Injection timing is improper - Check injection timing adjustment.
Fuel injection pump is defective - Change pump or rebuild it.
One of moving engine parts has broken - Change or repair damaged parts.
Clogged radiator fins or leaking radiator cap - Change cap or clean radiator.
Engine has a lack of coolant - Top up coolant fluid and check system for leaks.
Broken or loose fan belt - If necessary, replace the belt.
Not enough engine oil - Fill up the oil to required level.
Cylinder head gasket defective - Change cylinder head gasket.
Injection timing is incorrect - Adjust according to specifications.
Oil level is insufficient - Fill crankcase to proper oil level.
Worn oil pump - Repair or replace.
Plugged engine oil filter - Clean or change engine oil filter.
Relief valve is defective or dirty - Change or clean relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
External oil leaks: Damaged gaskets or seals - Change worn parts according to specifications.
Incorrect oil viscosity - Use proper viscosity oil.
Piston rings are defective or worn - Change piston rings.
Damaged valve guides or valve stems - Install new valves.
Pistons or cylinder liners are damaged - Check liners and pistons, replace as required.
Engine is cold - Normalize the temperature by warming up the engine.
Engine oil level is insufficient - Check oil level and add oil as required.
Timing of fuel injection pump is incorrect - Check the fuel injection pump timing adjustment.
Pistons are worn or scored - Install new pistons.
Connecting rod is worn or not aligned - Replace or align connecting rod.
Low battery power - Recharge the battery.
Battery does not hold charge - Battery needs to be serviced or replaced.
Disconnected wires or corroded battery terminals - Check cable connections and replace or service terminals.
Battery is discharged or worn - Replace or charge as required.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery power is low - Charge the battery.
Starter motor is faulty - Repair or replace starter.
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