Mitsubishi 4D32 Troubleshooting
| Engine Model: Mitsubishi 4D32 |
| Engine Type: 4-cycle inline 4-cylinder liquid-cooled diesel |
| Total Displacement: 217 cu.in (3.57 L) |
| Rated Engine Power: 108 Hp (81 kW) at 3500 rpm |
| Fuel System Type: Direct injection |
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| Engine difficult to start or doesn't start |
Fuel filter element clogging - Replace the filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are damaged - Service or change injection nozzles.
Faulty fuel injection pump - Repair or install new pump.
Valve timing is out of adjustment - Correct or replace timing gear.
Clogged fuel pipes - Service fuel pipes.
Injection timing is improper - Adjust according to specifications.
Worn cylinder or piston rings - Change defective parts.
Fuel filter element is clogged - Replace the filter element.
Fuel injection pump is not operating properly - Install a new fuel pump or repair.
Dirty air filter - Clean or replace element.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine stops unexpectedly during operation |
Incorrect adjustment of fuel injection pump timing - Adjust fuel injection pump as required.
Fuel filter element clogging - Replace filter element.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Defective or stuck injection nozzles - Repair or replace injection nozzles.
Too low idle RPM - Adjustment required.
Valve out of adjustment - Correct valve clearance.
Damaged fuel injection pump - Rebuild or install a new injection pump.
| Diesel engine loses power |
Fuel injection nozzles are dirty or defective - Replace injection nozzles.
Restricted fuel lines or hoses - Clean fuel system lines and hoses.
Clogged air cleaner - Replace air filter element.
Blown cylinder head gasket - Install a new gasket.
Wrong injection timing - Use correct injection timing adjustment.
Fuel injection pump is broken - Rebuild or install a new injection pump.
One of moving engine components has failed - Change or repair damaged parts.
Clogged radiator core or damaged radiator cap - Change cap or clean radiator.
Insufficient coolant fluid - Top up coolant fluid and check system for leaks.
Loose or damaged fan belt - Change the fan belt.
Lack of engine oil - Fill the crankcase with engine oil.
Damaged cylinder-head gasket - Gasket should be replaced.
Incorrect injection timing - Adjust as recommended.
| Insufficient oil pressure |
Insufficient engine oil - Fill crankcase to proper oil level.
Oil pump is defective - Remove and inspect oil pump.
Oil filter is dirty - Replace or clean engine oil filter element.
Relief valve is stuck or broken - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
Oil leaking: Gaskets or seals are excessively worn - Replace to repair leaks.
Improper oil viscosity - Fill up with the proper oil viscosity.
Seized or wear piston rings - Install new piston rings.
Damaged valve guides or valve stems - Replace defective valves.
Scored pistons or cylinder liners - Check pistons and liners, install new parts as required.
Engine not warmed up - Normalize the temperature by warming up the engine.
Insufficient engine oil - Need to add engine oil.
Wrong setting of fuel injection pump timing - Set it up as required.
Pistons are worn or broken - Replace the pistons as required.
Connecting rod is worn or not aligned - Align or replace connecting rod.
Battery voltage is low - Recharge the battery.
Battery won’t hold charge - Service charging system or change battery.
Bad terminals or disconnected battery cables - Check cables and service or change terminals.
Battery is low or faulty - Charge or change the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery power is low - Battery needs to be recharged.
Starter motor is faulty - Starter should be changed.
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