Mitsubishi K4C Troubleshooting
| Engine Model: Mitsubishi K4C |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 73.2 cu.in (1.2 L) |
| Rated Engine Power: 30 Hp (22 kW) at 2600 rpm |
| Fuel System Type: Indirect injection |
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| Engine starts up hard or will not start |
Fuel filter plugged - Replace filter element.
There is air in the fuel system - Bleed the system.
Faulty or dirty injection nozzles - Check and replace nozzles if required.
Fuel injection pump damage - Change or repair the pump.
Valve timing is out of adjustment - Use correct valve timing adjustment.
Fuel pipes are clogged - Clean or replace fuel pipes.
Injection timing is out of adjustment - Set up as recommended.
Worn cylinder or piston rings - Change faulty components.
| Diesel starts but stalls immediately |
Fuel filter element is clogged - Change filter element.
Fuel injection pump malfunction - Rebuild or install a new injection pump.
Air cleaner is dirty - Air filter maintenance required.
Incorrect nozzle opening pressure - Set it correctly.
| Engine shuts off suddenly while running |
Fuel injection timing is wrong - Set it up as required.
Dirty fuel filter - Change filter element.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Stuck or clogged injection nozzle - Change or repair injection nozzles.
| Engine stalls while idling |
Low idle speed setting is incorrect - Normalize low idle speed.
Excessive valve clearance - Check and adjust as required.
Fuel injection pump is not working correctly - Repair or install new pump.
Clogged or defective injection nozzles - If necessary, replace with a new nozzle.
Dirt in the fuel lines or hoses - Service fuel lines and hoses.
Restricted intake air - Service air cleaner.
Cylinder head gasket defective - Replace cylinder head gasket.
Unadjusted injection timing - Set up as recommended.
Fuel injection pump failure - Replace or repair injection pump.
Any of moving engine parts is worn - Repair or replace defective parts.
Defective radiator cap or clogged radiator fins - Clean radiator or replace cap.
Lack of engine coolant - The cooling system needs to be refilled and checked for faults.
Excessive wear of the fan belt - Replace as required.
Lack of engine oil - Fill up the engine oil.
Leaking cylinder head gasket - Replace cylinder head gasket.
Injection timing is improper - Use correct injection timing adjustment.
| Oil pressure is insufficient |
Not enough oil in the engine - Add oil as required.
Oil pump malfunction - Replace as required.
Oil filter is clogged - Clean or replace engine oil filter element.
Relief valve is defective or dirty - Change or service relief valve.
Clearance of crankshaft bearing is excessive - Check and replace or repair defective parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Engine using too much oil |
Oil leaks: Defective seals or gaskets - Replace defective parts.
Oil viscosity is incorrect - Use correct viscosity oil.
Damaged or seized piston rings - Change piston rings.
Worn valve stems and valve guides - Need to replace the valves.
Scored cylinder liners or pistons - Check liners and pistons, change as required.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.
Worn or scored pistons - Have pistons replaced.
Connecting rod misalignment or failure - Replace or align connecting rod.
Battery voltage is low - Low battery charging, charge as required.
Battery runs out quickly - Battery needs service or replacement.
Disconnected cables or faulty battery terminals - Check wire connections and change or service terminals.
Battery is low or faulty - Recharge or change battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery voltage - Battery is drained, charge it.
Starter motor failure - Repair or install a new starter.
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