Mitsubishi K3G Troubleshooting
| Engine Model: Mitsubishi K3G |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 75.4 cu.in (1.23 L) |
| Rated Engine Power: 25 Hp (19 kW) at 2600 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or doesn't start |
Fuel filter plugged - Service the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Clogged or defective injection nozzles - Check injection nozzles and replace if required.
Fuel injection pump is broken - Rebuild or change fuel pump.
Valve timing is incorrect - Set the valve timing correctly.
Plugged fuel pipes - Clean or change fuel pipes.
Injection timing is out of adjustment - Adjust as recommended.
Worn piston rings and cylinder - Replace faulty parts.
| Diesel starts and then shuts off |
Dirty fuel filter - Replace filter element.
Fuel injection pump is broken - Repair or change injection pump.
Dirty air cleaner - Clean or replace element.
Incorrect nozzle opening pressure - Adjust according to specifications.
| Engine stops suddenly during operation |
Improper fuel injection timing - Adjust fuel injection pump as required.
Fuel filter plugging - Change filter element.
Engine not warmed up - Warm up to required temperature.
Injection nozzles are burnt or jammed - Service or change injection nozzles.
| Engine stalls while idling |
Incorrectly adjusted low idle speed - Correct the settings.
Valve out of adjustment - Correct valve clearance.
Fuel injection pump is not operating properly - Rebuild or replace pump.
| Diesel engine loses power |
Fuel injection nozzles fault - If necessary, replace with a new nozzle.
Dirty fuel hoses or lines - Clean fuel lines and hoses.
Clogged air cleaner - Service air cleaner.
Cylinder head gasket is damaged - Install a new gasket.
Unadjusted injection timing - Set the injection timing correctly.
Fuel injection pump is defective - Replacement or repair required.
Any of moving engine components is faulty - Change or repair damaged parts.
Faulty radiator cap or dirty radiator fins - Install new cap or clean radiator.
Not enough coolant - Add coolant and check the components of cooling system.
Fan belt is loose or defective - Fan belt must be replaced.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Cylinder head gasket is blown - Cylinder-head gasket replacement required.
Injection timing is wrong - Set the injection timing correctly.
| Oil pressure is insufficient |
Oil level is insufficient - Add oil as required.
Oil pump is damaged - Install a new pump.
Oil filter is clogged - Service or replace engine oil filter.
Relief valve is stuck or worn - Change or clean relief valve.
Excessive oil clearance of crankshaft bearing - Inspect and replace or repair faulty parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Diesel engine consuming too much oil |
Oil leakage: Gaskets or seals may be damaged - Defective components must be replaced.
Oil viscosity is incorrect - Fill up with the correct oil viscosity.
Worn or stuck piston rings - Piston rings replacement required.
Damaged valve stems or valve guides - Replace defective valves.
Pistons or cylinder liners are worn - Check pistons and liners, replace as required.
| Abnormal engine knocking or noise |
Engine is not preheated - Warm up engine as required.
Insufficient engine oil - Checking oil level and add if necessary.
Wrong setting of fuel injection pump timing - Adjust according to specifications.
Broken or worn pistons - Have pistons replaced.
Connecting rod is worn or misaligned - Connecting rod must be aligned or replaced.
Battery voltage is low - Recharge the battery.
Battery will not hold charge - Service battery or change it.
Faulty battery terminals or disconnected cables - Connect cables correctly or replace terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Battery capacity is low - Battery needs to be recharged.
Faulty starter motor - Change or repair starter.
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