Mitsubishi K4D Troubleshooting
| Engine Model: Mitsubishi K4D |
| Engine Type: 4-cycle inline 4-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 79.6 cu.in (1.31 L) |
| Rated Engine Power: 28 Hp (20.6 kW) at 2700 rpm |
| Fuel System Type: Indirect fuel injection |
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| Engine starts up hard or won't start |
Clogged fuel filter - Clean or replace the filter.
Air trapped in fuel system - Bleed air.
Damaged or dirty injection nozzles - Clean or replace injection nozzles.
Fuel injection pump is defective - Change pump or rebuild it.
Unadjusted valve timing - Set the valve timing correctly.
Clogged fuel pipes - Service or change fuel pipes.
Injection timing is out of adjustment - Set up as recommended.
Excessive wear of piston rings and cylinder - Replace defective components.
| Engine starts but then stalls |
Fuel filter plugging - Install new filter element.
Fuel injection pump malfunction - Replace or repair injection pump.
Air filter clogged - Replace air filter element.
Nozzle opening pressure is incorrect - Adjust according to specifications.
| Engine shuts off suddenly during operation |
Incorrect adjustment of fuel injection pump timing - Adjust according to specifications.
Clogged fuel filter - Clean or change the filter.
Engine is not preheated - Engine is not warmed up to the required temperature.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
| Engine shuts off while idling |
Low idle speed set incorrectly - Correct low idle adjustment.
Incorrect valve clearance - Have it adjusted.
Damaged fuel injection pump - Install a new pump or rebuild.
Faulty or dirty injection nozzles - Change fuel injection nozzles.
Fuel lines or hoses clogging - Fuel hoses and lines must be clean.
Air cleaner is dirty - Change air filter element.
Damaged cylinder-head gasket - Cylinder-head gasket replacement required.
Injection timing is improper - Set up as recommended.
Fuel injection pump is damaged - Change pump or rebuild it.
Any of moving engine parts is worn - Repair or replace defective parts.
Dirty radiator fins or faulty radiator cap - Clean radiator or install new cap.
Engine has a lack of coolant - The cooling system needs to be refilled and checked for faults.
Fan belt is worn or faulty - Change the fan belt.
Engine oil level low - Fill up the oil to required level.
Cylinder-head gasket is leaking - Cylinder-head gasket replacement required.
Injection timing is improper - Adjust injection timing as required.
Oil level is low - Need to add oil.
Oil pump is worn or damaged - Replace as required.
Oil filter is dirty - Clean or change engine oil filter.
Relief valve is seized or worn - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Test and replace or repair worn components.
Clearance of crankpin bearing is excessive - Check and replace or repair defective parts.
| Engine using too much oil |
Oil leaks: Seals or gaskets are wearing excessively - Install new components.
Improper oil viscosity - Use correct viscosity oil.
Stuck or worn piston rings - Piston rings need to be replaced.
Damaged valve guides or valve stems - Valves must be replaced.
Worn pistons or cylinder liners - Check liners and pistons, install new components as required.
Engine not warmed up - Warm up the engine.
Engine oil insufficient - Need to add engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust fuel injection pump as required.
Worn or scored pistons - Have pistons replaced.
Connecting rod failure or misalignment - Connecting rod needs to be replaced or aligned.
Battery capacity is low - Battery needs to be recharged.
Battery drains quickly - Service or replace the battery.
Battery terminals are corroded or wires are disconnected - Check wiring and clean or replace terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery capacity is low - Battery is drained, charge it.
Starter motor is damaged - Replace or repair starter.
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