Yanmar 4TN82 Troubleshooting
| Engine Model: Yanmar 4TN82 |
| Engine Type: 4-cycle 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 110.8 cu.in (1.82 L) |
| Rated Engine Power: 38 Hp (28 kW) at 2800 rpm |
| Aspiration Type: Naturally aspirated |
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| Diesel engine hard to start or doesn't start |
Fuel filter plugging - Replace filter element.
Air trapped in fuel system - Bleed air.
Clogged or defective injection nozzles - Clean or change injection nozzles.
Fuel injection pump failure - Repair or change injection pump.
Unadjusted valve timing - Correct or change timing gear.
Clogged fuel pipes - Clean fuel pipes.
Wrong injection timing - Adjust injection timing as required.
Damaged piston rings and cylinder - Change faulty components.
| Engine starts and then shuts off |
Fuel filter element is clogged - Replace the filter element.
Fuel injection pump is defective - Rebuild or replace pump.
Intake air restriction - Service air cleaner.
Nozzle opening pressure is improper - Set up as recommended.
| Engine stops suddenly during operation |
Improper fuel injection timing - Adjust as recommended.
Dirty fuel filter - Change filter element.
Engine not warmed up - Warm up the engine.
Defective or stuck injection nozzles - Repair or replace injection nozzles.
| Engine stalls while idling |
Incorrect low idle setting - Adjust low idling as recommended.
Improper valve clearance - Need to adjust valve clearance.
Fuel injection pump is damaged - Replace or rebuild injection pump.
| Diesel engine loses power |
Damaged or dirty injection nozzles - Replace injection nozzles.
Fuel lines or hoses are clogged - Clean fuel lines and hoses.
Clogged air filter element - Replace air filter element.
Blown cylinder head gasket - Replace the gasket as required.
Incorrect injection timing - Adjust according to specifications.
Fuel injection pump is damaged - Change pump or rebuild it.
Any of moving engine parts is worn - Repair or replace defective parts.
Clogged radiator fins or leaking radiator cap - Clean radiator or replace cap.
Insufficient coolant - Refill to the correct level and inspect system for leaks.
Loose or damaged fan belt - Change the fan belt.
Engine oil level is low - Fill the crankcase with engine oil.
Cylinder-head gasket is leaking - Gasket should be replaced.
Injection timing is incorrect - Check injection timing adjustment.
Low crankcase oil level - Check and refill the oil.
Defective oil pump - Check and replace if necessary.
Engine oil filter is plugged - Service or replace engine oil filter.
Stuck or defective relief valve - Change or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Clearance of crankpin bearing is excessive - Check and replace or repair defective parts.
Oil leaking: Seals or gaskets are defective - Install new components.
Incorrect oil viscosity - Use correct viscosity oil.
Piston rings are stuck or broken - Change piston rings.
Valve guides and stems are worn - Valves replacement required.
Cylinder liners or pistons are damaged - Check pistons and liners, change as required.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Low engine oil level - Check and refill engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust according to specifications.
Piston wear or scoring - Have pistons replaced.
Connecting rod failure or misalignment - Align or replace connecting rod.
Low battery output - Battery is drained, recharge it.
Battery does not hold charge - Service or change the battery.
Battery terminals are corroded or wires are disconnected - Connect wiring correctly or install new terminals.
| Starter motor is not working |
Battery is drained or worn - Replace or charge as required.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery capacity is low - Charge the battery.
Damaged starter motor - Starter should be changed.
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