Yanmar 2TNV70 Troubleshooting
| Engine Model: Yanmar 2TNV70 |
| Engine Type: 4-cycle 2-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 34.8 cu.in (0.57 L) |
| Rated Engine Power: 12.2 Hp (9.1 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine hard to start or will not start |
Fuel filter element is clogged - Filter maintenance required.
Air in fuel tank - Bleed fuel tank.
Clogged injection nozzle - Replace injection nozzles.
Fuel injection pump is broken - Repair or install new pump.
Incorrect valve timing - Set the valve timing correctly.
Dirt in the fuel lines or hoses - Service or change fuel pipes.
Injection timing is improper - Set up as recommended.
Piston rings and cylinder are worn - Replace defective parts.
Fuel filter plugged - Install new filter element.
Damaged fuel injection pump - Rebuild or replace pump.
Plugged air filter - Air filter maintenance required.
Nozzle opening pressure is incorrect - Set it correctly.
| Engine stalls while running |
Wrong setting of fuel injection pump timing - Adjust as recommended.
Dirty fuel filter - Change filter element.
Engine is cold - Engine is not warmed up to the required temperature.
Stuck or burnt injection nozzle - Check injection nozzles and replace if required.
Incorrectly adjusted low idle speed - Adjust the low idle speed.
Incorrect valve clearance - Adjust to proper valve clearance.
Fuel injection pump is not working correctly - Repair or change injection pump.
| Diesel engine loses power |
Clogged or burnt injection nozzle - Check injection nozzles and replace if required.
Fuel lines or hoses are dirty - Clean fuel system hoses and lines.
Dirty air cleaner - Service air cleaner.
Cylinder-head gasket is leaking - Replace the gasket as required.
Wrong injection timing - Adjust injection timing as required.
Fuel injection pump is faulty - Rebuild or change fuel pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Dirty radiator core or faulty radiator cap - Clean radiator or install new cap.
Not enough coolant - Fill radiator to proper level and check components for faults.
Broken or loose fan belt - Change the fan belt.
Insufficient engine oil - Add oil to the engine crankcase.
Damaged cylinder-head gasket - Replace the gasket as required.
Injection timing is out of adjustment - Adjust injection timing as required.
Low oil level - Fill up the engine oil.
Oil pump is defective - Replace as required.
Oil filter element clogged - Replace or clean engine oil filter element.
Relief valve is stuck or worn - Change or service relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty parts.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty components.
| Engine using too much oil |
Oil leaks: Gaskets or seals can be faulty - New components need to be installed.
Incorrect oil viscosity - Fill up with the proper oil viscosity.
Seized or wear piston rings - Have piston rings replaced.
Worn valve guides and valve stems - Replace the valves.
Cylinder liners or pistons are worn - Inspect liners and pistons, change as necessary.
Engine is cold - Warm up the engine.
Not enough engine oil - Need to add engine oil.
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Pistons are worn or broken - Pistons replacement required.
Connecting rod is worn or not aligned - Align or change connecting rod.
Battery capacity is low - Battery is drained, charge it.
Battery is draining quickly - Service charging system or replace battery.
Disconnected wiring or bad battery terminals - Check battery wires and service or replace terminals.
| Starter motor is not working |
Battery is low or faulty - Change or recharge battery.
Wire harness is disconnected or incorrectly connected - Check wire harness and connect as required.
Battery power is low - Battery is drained, charge it.
Starter motor failing - Starter should be changed.
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