Yanmar 3TNA72UJ3 Troubleshooting
| Engine Model: Yanmar 3TNA72UJ3 |
| 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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| Diesel hard to start or doesn't start |
Dirty fuel filter - Replace filter element.
There is air in the fuel system - Bleed the system.
Defective injection nozzle - Check and replace nozzles if required.
Faulty fuel injection pump - Install a new fuel pump or repair.
Valve timing is improper - Use correct valve timing adjustment.
Restricted fuel pipes - Service or replace fuel pipes.
Unadjusted injection timing - Adjust injection timing as required.
Piston rings and cylinder are worn - Replace defective parts.
Clogged fuel filter - Change the filter element.
Fuel injection pump is damaged - Rebuild or replace pump.
Clogged air cleaner - Air filter maintenance required.
Incorrect nozzle opening pressure - Set it correctly.
| Engine stops running suddenly |
Incorrect adjustment of fuel injection pump timing - Set up as recommended.
Fuel filter plugging - Service the filter.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Injection nozzles are jammed or clogged - Change or repair injection nozzles.
Improperly adjusted low idle speed - Correct low idle adjustment.
Excessive valve clearance - Adjust to proper valve clearance.
Fuel injection pump failure - Repair or replace injection pump.
Damaged or dirty injection nozzles - Test injection nozzles and change if necessary.
Dirty fuel hoses or lines - Clean fuel system lines and hoses.
Dirty air filter element - Install new air filter element.
Blown cylinder head gasket - Replace cylinder head gasket.
Improper injection timing - Check injection timing adjustment.
Fuel injection pump is damaged - Replace injection pump or repair it.
One of moving engine components has failed - Repair or replace defective components.
Dirty radiator core or faulty radiator cap - Change cap or clean radiator.
Engine has a lack of coolant - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is worn or faulty - Belt change is required.
Engine oil insufficient - Fill the crankcase with engine oil.
Cylinder head gasket is defective - Replace the gasket as required.
Improper injection timing - Set the injection timing correctly.
Oil level is low - Check oil level and add oil as required.
Oil pump is defective - Inspect and change as required.
Dirty oil filter - Service or replace engine oil filter.
Worn or dirty relief valve - Change or service relief valve.
Clearance of crankshaft bearing is excessive - Check and change or repair defective parts.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty components.
| High engine oil consumption |
Oil leaking: Damaged seals or gaskets - Change worn parts according to specifications.
Improper oil viscosity - Use oil of proper viscosity.
Worn or stuck piston rings - Piston rings need to be replaced.
Damaged valve guides or valve stems - Replace defective valves.
Pistons or cylinder liners are scuffed - Inspect liners and pistons, fit new parts as necessary.
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Insufficient engine oil - Need to add engine oil.
Improper fuel injection timing - Adjust the pump as required.
Pistons are worn or scored - Install new pistons.
Connecting rod is misaligned or defective - Need to align or replace the connecting rod.
Low battery output voltage - Low battery charging, charge as required.
Battery runs out quickly - Battery needs to be serviced or replaced.
Disconnected wires or corroded battery terminals - Check cable connections and replace or service terminals.
Battery is drained or worn - Recharge or change battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Battery power is low - Recharge the battery.
Starter motor failing - Repair or change starter.
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