Mitsubishi K3M Troubleshooting
| Engine Model: Mitsubishi K3M |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 91.3 cu.in (1.49 L) |
| Rated Engine Power: 30 Hp (22 kW) at 3000 rpm |
| Fuel System Type: Indirect injection |
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| Engine hard to start or doesn't start |
Clogged fuel filter - Change filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are clogged or faulty - Clean or change injection nozzles.
Defective fuel injection pump - Rebuild or change fuel pump.
Valve timing is improper - Set the valve timing correctly.
Restricted fuel pipes - Service fuel pipes.
Injection timing is out of adjustment - Adjust injection timing as required.
Piston rings and cylinder are worn - Replace faulty components.
| Engine starts but stalls suddenly |
Fuel filter element clogging - Clean the filter or install new filter element.
Fuel injection pump is not operating properly - Change pump or rebuild it.
Air filter plugged - Clean or change.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine shuts off suddenly during operation |
Wrong setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Fuel filter element clogging - Change filter element.
Low coolant temperature - Normalize the temperature by warming up the engine.
Injection nozzles sticking or clogged - Repair or replace injection nozzles.
| Engine stops while idling |
Improperly adjusted low idle speed - Normalize low idle speed.
Valve clearance is wrong - Check and adjust.
Fuel injection pump damage - Repair or change injection pump.
Fuel injection nozzles are clogged or faulty - Install a new kit of correctly balanced nozzles.
Restricted fuel hoses or lines - Clean fuel system hoses and lines.
Air filter is clogged - Replace air filter element.
Cylinder head gasket is blown - Gasket should be replaced.
Injection timing is wrong - Adjust according to specifications.
Fuel injection pump is defective - Change pump or rebuild it.
Any of moving engine parts is worn - Change or repair damaged parts.
Clogged radiator fins or leaking radiator cap - Install new cap or clean radiator.
Engine has a lack of coolant - Add coolant and check the components of cooling system.
Fan belt is worn or faulty - Replace as required.
Engine oil level low - Check oil level and add oil as required.
Cylinder-head gasket is leaking - Change cylinder head gasket.
Improper injection timing - Adjust injection timing as required.
Engine oil insufficient - Checking oil level and add if necessary.
Oil pump is worn or damaged - Remove and inspect oil pump.
Clogged oil filter - Change or clean engine oil filter element.
Worn or dirty relief valve - Change or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty components.
| Engine consuming too much oil |
Oil leaks: Worn gaskets or seals - Replace defective parts.
Wrong oil viscosity - Fill up with the correct oil viscosity.
Stuck or worn piston rings - Install new piston rings.
Damaged valve stems or valve guides - Replace defective valves.
Scuffed pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
| Abnormal engine knocking or noise |
Engine not warmed up - Warm up to required temperature.
Low engine oil level - Fill the crankcase with engine oil.
Improper fuel injection timing - Check the fuel injection pump timing adjustment.
Worn or scored pistons - Replace the pistons.
Connecting rod is misaligned or defective - Align or change connecting rod.
Low battery output - Charge the battery.
Battery discharges quickly - Service charging system or replace battery.
Disconnected cables or faulty battery terminals - Check wiring connections and replace or clean terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Low battery power - Recharge the battery.
Damaged starter motor - Starter should be changed.
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