Mitsubishi K3H Troubleshooting
| Engine Model: Mitsubishi K3H |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 78.7 cu.in (1.29 L) |
| Rated Engine Power: 28 Hp (21 kW) at 2700 rpm |
| Fuel System Type: Direct injection |
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| Engine starts hard or won't start |
Fuel filter element is dirty - Install new filter element.
There is air in the fuel system - Bleed the system.
Faulty fuel injection nozzles - Inspect nozzles and replace if necessary.
Fuel injection pump malfunction - Replace or rebuild injection pump.
Wrong valve timing - Adjust or replace timing gear.
Restricted fuel pipes - Service fuel pipes.
Improper injection timing - Adjust injection timing as required.
Piston rings and cylinder are worn - Change faulty parts.
| Engine stalls after starting |
Fuel filter element is dirty - Filter maintenance required.
Fuel injection pump is not operating properly - Install a new pump or rebuild.
Restricted intake air - Change air filter element.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine stops unexpectedly during operation |
Incorrect adjustment of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Fuel filter element is dirty - Change filter element.
Engine is not fully warmed up - Warm up the engine.
Injection nozzles are stuck or clogged - Repair or change injection nozzles.
| Engine shuts off while idling |
Low idle speed setting is not correct - Correct low idle settings.
The valve clearance is incorrect - Check and adjust.
Fuel injection pump failure - Change pump or rebuild it.
| Diesel engine is losing power |
Fuel injection nozzles are faulty or clogged - Inspect nozzles and replace if necessary.
Dirt in the fuel lines or hoses - Clean fuel system hoses and lines.
Dirty air filter - Carry out maintenance on air filter.
Cylinder-head gasket is leaking - Change cylinder head gasket.
Injection timing is incorrect - Set up as recommended.
Fuel injection pump is damaged - Rebuild or install a new injection pump.
Any of moving engine parts is worn - Change or repair damaged parts.
Dirty radiator fins or defective radiator cap - Clean radiator or install new cap.
Lack of engine coolant - Fill the cooling system and check components for leaks or other faults.
Fan belt is broken or worn - The fan belt needs to be replaced.
Engine oil level is insufficient - Add oil to the engine crankcase.
Cylinder head gasket defective - Gasket should be replaced.
Unadjusted injection timing - Adjust as recommended.
Low oil level - Fill the crankcase with oil.
Oil pump is damaged - Install a new pump.
Oil filter element is dirty - Replace or service engine oil filter.
Stuck or defective relief valve - Replace or clean relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty parts.
| Diesel engine consuming too much oil |
Oil leakage: Gaskets or seals can be faulty - Replace defective parts.
Oil viscosity is wrong - Fill up with the correct oil viscosity.
Piston rings are seized or worn - Replace piston rings.
Damaged valve guides or valve stems - Valves replacement required.
Damaged pistons or cylinder liners - Check liners and pistons, install new components as required.
| Engine knocking sound or abnormal noise |
Engine not warmed up - Warm up the engine.
Lack of engine oil - Add oil to the engine crankcase.
Timing of fuel injection pump is incorrect - Check the fuel injection pump timing adjustment.
Pistons are broken or worn - Install new pistons.
Connecting rod is misaligned or defective - Need to align or replace the connecting rod.
Battery capacity is low - Battery needs to be recharged.
Battery is draining quickly - Battery needs service or replacement.
Disconnected wiring or bad battery terminals - Connect cables correctly or replace terminals.
Battery is drained or worn - Need to charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output - Battery is drained, recharge it.
Starter motor is faulty - Repair or change starter.
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