Yanmar 3TNV70 Troubleshooting
| Engine Model: Yanmar 3TNV70 |
| Engine Type: 4-cycle 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 52.1 cu.in (0.85 L) |
| Rated Engine Power: 18.4 Hp (13.7 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine hard to start or won't start |
Dirty fuel filter - Install new filter element.
Air in the fuel system - Air bleeding.
Fuel injection nozzles fault - Test injection nozzles and change if necessary.
Fuel injection pump malfunctioning - Repair or install a new fuel pump.
Improper valve timing - Correct or change timing gear.
Dirty fuel pipes - Clean fuel pipes.
Improper injection timing - Adjust injection timing as required.
Piston rings and cylinder are worn - Change defective components.
| Engine starts but stops suddenly |
Fuel filter element is clogged - Change filter element.
Fuel injection pump is damaged - Repair or install new pump.
Air filter plugged - Clean or change the filter.
Unadjusted nozzle opening pressure - Set up as recommended.
| Diesel shuts off while driving |
Fuel injection timing is wrong - Use the correct fuel injection pump timing adjustment.
Fuel filter element clogging - Filter maintenance required.
Coolant temperature is low - Warm up the engine.
Stuck or clogged injection nozzle - Service or change injection nozzles.
Low idle speed setting is incorrect - Correct the settings.
Valve out of adjustment - Adjust valve clearance.
Damaged fuel injection pump - Replacement or repair required.
| Engine power is insufficient |
Faulty fuel injection nozzles - If necessary, replace with a new nozzle.
Fuel lines or hoses are clogged - Fuel hoses and lines must be clean.
Air filter element clogged - Clean or change.
Cylinder head gasket is defective - Replace the gasket as required.
Incorrect injection timing - Adjust as recommended.
Fuel injection pump is broken - Repair or install new pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Defective radiator cap or clogged radiator fins - Replace cap or clean radiator.
Lack of engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Fan belt slipping or worn - Change as required.
Engine oil level is low - Need to add engine oil.
Cylinder head gasket is blown - Change cylinder head gasket.
Improper injection timing - Adjust as recommended.
Low oil level - Add oil to the engine crankcase.
Oil pump is damaged - Install a new pump.
Dirty oil filter element - Service or change engine oil filter element.
Relief valve is stuck or worn - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty components.
Crankpin bearing clearance is excessive - Check and replace or repair defective parts.
| High engine oil consumption |
Oil leaks: Damaged gaskets or seals - Defective components must be replaced.
Improper oil viscosity - Fill up with the proper oil viscosity.
Stuck or worn piston rings - Change piston rings.
Worn valve guides and valve stems - Valves need to be changed.
Pistons or cylinder liners are worn - Check liners and pistons, replace as required.
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Not enough engine oil - Check and refill engine oil.
Improper fuel injection timing - Adjust as recommended.
Pistons are worn or scored - Replace the pistons as required.
Misaligned or defective connecting rod - Need to replace or align the connecting rod.
Battery voltage is low - Battery needs to be recharged.
Battery runs out quickly - Service charging system or change battery.
Battery cables are disconnected or terminals are faulty - Connect wiring properly or install new terminals.
Battery is low or faulty - Charge or replace the battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Battery power is low - Battery needs to be recharged.
Starter motor is damaged - Starter should be changed.
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