Mitsubishi K3C Troubleshooting
| Engine Model: Mitsubishi K3C |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 54.9 cu.in (0.9 L) |
| Rated Engine Power: 18.5 Hp (13.6 kW) at 2700 rpm |
| Fuel System Type: Indirect fuel injection |
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| Engine hard to start or won't start |
Dirty fuel filter - Install new filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are faulty or clogged - If necessary, replace with a new nozzle.
Fuel injection pump malfunction - Replace injection pump or repair it.
Valve timing is out of adjustment - Set the valve timing correctly.
Restricted fuel pipes - Service or change fuel pipes.
Injection timing is incorrect - Check injection timing adjustment.
Worn piston rings and cylinder - Change defective components.
| Engine starts but then stops |
Fuel filter element is dirty - Replace the filter element.
Faulty fuel injection pump - Install a new pump or rebuild.
Dirty air filter - Clean or change.
Nozzle opening pressure is incorrect - Adjust according to specifications.
| Engine stops unexpectedly during operation |
Wrong setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Clogged fuel filter - Clean the filter or install new filter element.
Engine is cold - Warm up engine as required.
Injection nozzles sticking or clogged - Clean or replace injection nozzles.
| Engine stalls while idling |
Low idle speed setting is incorrect - Adjust the low idle speed.
Valve out of adjustment - Correct valve clearance.
Damaged fuel injection pump - Repair or install a new fuel pump.
Clogged or burnt injection nozzle - Test injection nozzles and change if necessary.
Dirt in the fuel lines or hoses - Fuel lines and hoses need to be cleaned.
Dirty air cleaner - Change air filter element.
Defective cylinder head gasket - Cylinder-head gasket replacement required.
Injection timing is incorrect - Check injection timing adjustment.
Fuel injection pump is faulty - Replacement or repair required.
Any of moving engine parts is worn - Repair or replace defective components.
Clogged radiator core or damaged radiator cap - Install new cap or clean radiator.
Low engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Loose or defective fan belt - Change the fan belt.
Insufficient engine oil - Fill up the engine oil.
Cylinder head gasket is damaged - Replace cylinder head gasket.
Incorrect injection timing - Set up as recommended.
Insufficient engine oil - Check and refill the oil.
Oil pump is worn or damaged - Repair or change.
Plugged engine oil filter - Service or replace engine oil filter.
Stuck or worn relief valve - Change or clean relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Test and replace or repair worn components.
| Excessive engine oil consumption |
Oil leaking: Defective seals or gaskets - Replace to repair leaks.
Oil viscosity is wrong - Use proper viscosity oil.
Worn or stuck piston rings - Piston rings replacement required.
Worn valve stems and valve guides - Replace the valves.
Worn cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary.
Engine is cold - Warm up the engine.
Low engine oil level - Add oil to the engine crankcase.
Wrong setting of fuel injection pump timing - Adjust fuel injection pump as required.
Scored or worn pistons - Install new pistons.
Connecting rod is not aligned or defective - Need to replace or align the connecting rod.
Low battery power - Battery needs to be recharged.
Battery discharges quickly - Service charging system or change battery.
Disconnected wires or corroded battery terminals - Connect wiring properly or install new terminals.
Battery is low or faulty - Replace or charge as required.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output voltage - Battery needs to be recharged.
Starter motor failing - Starter needs to be replaced.
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