Mitsubishi K3B Troubleshooting
| Engine Model: Mitsubishi K3B |
| Engine Type: 4-cycle inline 3-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 51.8 cu.in (0.85 L) |
| Rated Engine Power: 15 Hp (11.2 kW) at 2000 rpm |
| Fuel System Type: Indirect injection |
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| Engine difficult to start or doesn't start |
Dirty fuel filter - Install new filter element.
Air in the fuel lines - Bleed the fuel lines.
Defective or clogged injection nozzle - Change fuel injection nozzles.
Faulty fuel injection pump - Replace or rebuild injection pump.
Wrong valve timing - Correct or replace timing gear.
Fuel pipes are dirty - Clean or change fuel pipes.
Injection timing is improper - Set up as recommended.
Worn piston rings and cylinder - Replace faulty components.
| Diesel starts but immediately stops |
Fuel filter plugged - Service or replace the filter.
Defective fuel injection pump - Change pump or rebuild it.
Air filter plugged - Clean or replace the element.
Improper nozzle opening pressure - Set up as recommended.
| Engine stalls while running |
Fuel injection timing is wrong - Set up as recommended.
Fuel filter element clogging - Service the filter.
Engine is not fully warmed up - Warm up engine as required.
Stuck or burnt injection nozzle - Clean or change injection nozzles.
| Engine stalls when idling |
Low idle speed setting is incorrect - Correct low idle settings.
Valve out of adjustment - Adjust to proper valve clearance.
Fuel injection pump malfunctioning - Rebuild or replace pump.
Clogged injection nozzle - Change fuel injection nozzles.
Fuel hoses or lines are clogged - Service fuel hoses and lines.
Air filter plugged - Clean or replace element.
Cylinder head gasket is defective - Install new cylinder head gasket.
Injection timing is wrong - Adjust as recommended.
Fuel injection pump is faulty - Change or repair the pump.
One of moving engine parts has broken - Repair or replace defective components.
Dirty radiator core or defective radiator cap - Clean radiator or change cap.
Lack of engine coolant - Add coolant and check the components of cooling system.
Excessive wear of the fan belt - Belt replacement is recommended.
Engine oil level is low - Check oil level and add oil as required.
Cylinder head gasket is damaged - Replace cylinder head gasket.
Injection timing is out of adjustment - Check injection timing adjustment.
| Oil pressure is insufficient |
Not enough oil in the engine - Fill the crankcase with oil.
Defective oil pump - Repair or replace.
Oil filter element is dirty - Service or replace engine oil filter.
Relief valve is defective or dirty - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
Oil leakage: Seals or gaskets are defective - Change to repair leaks.
Crankcase oil too light - Use oil of correct viscosity.
Stuck or defective piston rings - Change piston rings.
Valve stems or guides are damaged - Need to replace the valves.
Worn pistons or cylinder liners - Inspect liners and pistons, fit new parts as necessary.
| Abnormal engine noise or knocking |
Engine not warmed up - Normalize the temperature by warming up the engine.
Engine oil insufficient - Fill up the oil to required level.
Improper fuel injection timing - Adjust according to specifications.
Pistons are scored or worn - Pistons replacement required.
Connecting rod is defective or not aligned - Connecting rod must be aligned or replaced.
Battery power is low - Charge the battery.
Battery does not hold charge - Service battery or replace it.
Corroded battery terminals or disconnected wires - Connect wiring properly or install new terminals.
Battery is low or faulty - Recharge or replace battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery output voltage - Battery needs to be recharged.
Damaged starter motor - Starter should be changed.
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