Mitsubishi K4E Troubleshooting
| Engine Model: Mitsubishi K4E |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 86.4 cu.in (1.42 L) |
| Rated Engine Power: 31 Hp (23.1 kW) at 2500 rpm |
| Fuel System Type: Indirect injection |
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| Engine hard to start or won't start |
Fuel filter element is dirty - Filter maintenance required.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are damaged or dirty - Change fuel injection nozzles.
Fuel injection pump damage - Change or repair the pump.
Incorrect valve timing - Adjust or replace timing gear.
Fuel pipes are clogged - Service or replace fuel pipes.
Injection timing is incorrect - Use correct injection timing adjustment.
Excessive wear of piston rings and cylinder - Replace defective components.
| Engine starts and stalls suddenly |
Fuel filter element clogging - Service or replace the filter.
Fuel injection pump failure - Repair or change injection pump.
Air filter plugged - Replace air filter element.
Incorrect nozzle opening pressure - Adjust according to specifications.
| Diesel shuts off while driving |
Incorrect adjustment of fuel injection pump timing - Set up as recommended.
Clogged fuel filter - Clean or replace the filter.
Engine is not warmed up to the required temperature - Warm up the engine.
Injection nozzles sticking or clogged - Clean or change injection nozzles.
Incorrectly adjusted low idle speed - Normalize low idle speed.
Valve clearance is not correct - Correct valve clearance.
Fuel injection pump malfunction - Change or repair the pump.
| Diesel engine loses power |
Clogged injection nozzle - Check and replace nozzles if required.
Restricted fuel hoses or lines - Clean fuel system hoses and lines.
Clogged air filter element - Air filter maintenance required.
Worn cylinder head gasket - Gasket should be replaced.
Injection timing is incorrect - Adjust injection timing as required.
Fuel injection pump is broken - Install a new pump or rebuild.
One of moving engine parts is faulty - Repair or replace defective components.
Dirty radiator fins or faulty radiator cap - Clean radiator or install new cap.
Lack of engine coolant - The cooling system needs to be refilled and checked for faults.
Damaged or worn fan belt - Fan belt must be replaced.
Lack of engine oil - Fill the crankcase with engine oil.
Worn cylinder head gasket - Gasket should be replaced.
Incorrect injection timing - Adjust injection timing as required.
| Insufficient oil pressure |
Oil level is low - Need to add oil.
Oil pump is worn or damaged - Inspect and change as required.
Oil filter is dirty - Replace or clean engine oil filter element.
Worn or dirty relief valve - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and replace or repair worn components.
Excessive crankpin bearing clearance - Check and replace or repair defective parts.
| Diesel engine consuming too much oil |
External oil leaks: Seals or gaskets are wearing excessively - Change to repair leaks.
Improper oil viscosity - Use oil of proper viscosity.
Piston rings are stuck or broken - Change the piston rings as required.
Valve stems or guides are damaged - Replace the valves.
Scored pistons or cylinder liners - Inspect pistons and liners, change as required.
Engine is cold - Warm up engine as required.
Engine oil level is insufficient - Fill up the oil to required level.
Improper fuel injection timing - Set it up as required.
Piston wear or scoring - Have pistons replaced.
Connecting rod failure or misalignment - Need to align or replace the connecting rod.
Low battery output voltage - Charge the battery.
Battery won’t hold charge - Service or replace the battery.
Bad terminals or disconnected battery cables - Check cable connections and replace or service terminals.
Battery is discharged or worn - Recharge or change battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery voltage is low - Low battery charging, charge as required.
Defective starter motor - Starter should be changed.
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