Yanmar 3TNM72-APL Troubleshooting
| Engine Model: Yanmar 3TNM72-APL |
| Engine Type: 4-cycle vertical 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 55.1 cu.in (0.90 L) |
| Rated Engine Power: 23.6 Hp (17.6 kW) at 3600 rpm |
| Aspiration Type: Naturally aspirated |
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| Diesel hard to start or doesn't start |
Fuel filter element is dirty - Change the filter element.
Air in fuel tank - Bleed fuel tank.
Dirty or damaged injection nozzles - Service or change injection nozzles.
Fuel injection pump is damaged - Repair or install new pump.
Valve timing is out of adjustment - Correct or change timing gear.
Dirt in the fuel lines or hoses - Clean fuel pipes.
Injection timing is improper - Adjust according to specifications.
Worn cylinder or piston rings - Change defective components.
| Engine stalls after starting |
Fuel filter element is dirty - Change the filter element.
Fuel injection pump failure - Replace or rebuild injection pump.
Air filter plugged - Clean or change the filter.
Incorrect nozzle opening pressure - Adjust according to specifications.
| Engine shuts off suddenly during operation |
Fuel injection timing is wrong - Adjust as recommended.
Fuel filter element is clogged - Clean the filter element.
Engine is cold - Warm up engine as required.
Stuck or burnt injection nozzle - Repair or change injection nozzles.
Too low idle RPM - Adjust low idle speed.
Valve clearance is wrong - Adjust to proper valve clearance.
Fuel injection pump malfunctioning - Change or repair the pump.
Fuel injection nozzles fault - Install a new kit of correctly balanced nozzles.
Clogged fuel lines or hoses - Clean fuel lines and hoses.
Clogged air filter element - Clean or change the filter.
Cylinder-head gasket is broken - Replace cylinder head gasket.
Injection timing is improper - Set up as recommended.
Fuel injection pump is damaged - Replacement or repair required.
One of moving engine components is worn - Repair or replace defective parts.
Radiator fins are dirty or radiator cap is defective - Clean radiator or replace cap.
Low engine coolant - Add coolant fluid to cooling system and also check it for leaks.
Fan belt is broken or worn - Belt change is required.
Insufficient engine oil - Need to add engine oil.
Cylinder head gasket defective - Replace cylinder head gasket.
Injection timing is improper - Check injection timing adjustment.
| Insufficient oil pressure |
Not enough oil in the engine - Fill the crankcase with oil.
Oil pump is worn or damaged - Repair or change.
Dirty oil filter element - Service or change engine oil filter element.
Relief valve is defective or dirty - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Excessive engine oil consumption |
Oil leaks: Damaged seals or gaskets - Replace worn parts to avoid leaks.
Improper oil viscosity - Use oil of correct viscosity.
Seized or wear piston rings - Have piston rings replaced.
Worn valve stems and valve guides - Need to replace the valves.
Pistons or cylinder liners are scored - Check liners and pistons, replace as required.
Low coolant temperature - Warm up engine as required.
Lack of engine oil - Check and refill engine oil.
Improper fuel injection timing - Set up as recommended.
Pistons are worn or broken - Pistons need to be replaced.
Connecting rod is misaligned or worn - Alignment procedure or replacement is required.
Low battery voltage - Battery is drained, recharge it.
Battery drains quickly - Service charging system or change battery.
Bad battery terminals or disconnected wiring - Check cables and clean or change terminals.
| Starter motor is not working |
Battery is discharged or defective - Battery needs to be recharged or replaced.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Battery voltage is low - Battery is drained, recharge it.
Starter motor failure - Starter should be replaced.
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