Yanmar 3TNA72UJ Troubleshooting
| Engine Model: Yanmar 3TNA72UJ |
| Engine Type: 4-cycle 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 53.6 cu.in (0.88 L) |
| Rated Engine Power: 16.4 Hp (22 kW) at 3600 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts up hard or doesn't start |
Fuel filter element clogging - Filter maintenance required.
Air in the fuel pipes - Bleed the fuel pipes.
Faulty fuel injection nozzles - Inspect nozzles and replace if necessary.
Fuel injection pump is not operating properly - Install a new fuel pump or repair.
Incorrect valve timing - Correct or replace timing gear.
Fuel pipes are dirty - Clean fuel pipes.
Unadjusted injection timing - Adjust as recommended.
Cylinder or piston rings are worn - Replace faulty parts.
| Diesel starts but stalls immediately |
Clogged fuel filter - Clean or change the filter.
Fuel injection pump is not operating properly - Install a new pump or rebuild.
Air filter plugged - Service or replace the air filter.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine stalls during operation |
Incorrect adjustment of fuel injection pump timing - Adjust fuel injection pump as required.
Fuel filter element is dirty - Replace the filter element.
Engine not warmed up - Warm up to required temperature.
Injection nozzles sticking or clogged - Clean or replace injection nozzles.
Low idle speed setting is incorrect - Adjustment required.
Valve clearance is not correct - Have it adjusted.
Fuel injection pump is broken - Replace or rebuild injection pump.
Fuel injection nozzles are dirty or defective - Clean or replace injection nozzles.
Restricted fuel hoses or lines - Service fuel hoses and lines.
Restricted intake air - Clean or replace the element.
Cylinder head gasket is damaged - Cylinder-head gasket replacement required.
Injection timing is out of adjustment - Adjust as recommended.
Fuel injection pump is faulty - Install a new pump or rebuild.
Any of moving engine components is faulty - Repair or replace defective parts.
Faulty radiator cap or dirty radiator fins - Clean radiator or replace cap.
Low coolant level - Add coolant and check the components of cooling system.
Excessive wear of the fan belt - The fan belt needs to be replaced.
Insufficient engine oil - Fill up the oil to required level.
Cylinder head gasket defective - Change cylinder head gasket.
Wrong injection timing - Set the injection timing correctly.
Not enough oil in the engine - Checking oil level and add if necessary.
Defective oil pump - Inspect and change as required.
Clogged oil filter - Replace or clean engine oil filter element.
Stuck or defective relief valve - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Check and replace or repair defective parts.
Excessive oil clearance of crankpin bearing - Inspect and replace or repair faulty parts.
| Engine using too much oil |
Oil leaking: Damaged gaskets or seals - Worn parts need to be replaced.
Incorrect oil viscosity - Fill up with the proper oil viscosity.
Piston rings are stuck or worn - Change the piston rings as required.
Valve guides and stems are worn - Valves replacement required.
Scuffed pistons or cylinder liners - Inspect pistons and liners, replace as required.
Engine not warmed up - Warm up the engine.
Insufficient engine oil - Need to add engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.
Pistons are broken or worn - Replace the pistons.
Connecting rod is misaligned or worn - Alignment procedure or replacement is required.
Battery capacity is low - Charge the battery.
Battery is not holding charge - Service or change the battery.
Battery terminals are corroded or wires are disconnected - Connect cables properly or replace terminals.
Battery is low or faulty - Change or recharge battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery capacity is low - Charge the battery.
Starter motor is damaged - Starter should be replaced.
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