Yanmar 3TNV80FT Troubleshooting
| Engine Model: Yanmar 3TNV80FT |
| Engine Type: 4-cycle vertical 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 77.2 cu.in (1.27 L) |
| Rated Engine Power: 24.7 Hp (18.4 kW) at 2600 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts up hard or will not start |
Fuel filter element clogging - Service or replace the filter.
Air in fuel tank - Bleed fuel tank.
Dirty or faulty injection nozzles - Replace injection nozzles.
Fuel injection pump is defective - Change or repair the pump.
Valve timing is wrong - Adjust or change timing gear.
Fuel pipes clogging - Clean or change fuel pipes.
Improper injection timing - Use correct injection timing adjustment.
Worn cylinder or piston rings - Change faulty components.
| Diesel starts but immediately stops |
Clogged fuel filter - Clean or replace the filter.
Fuel injection pump is faulty - Replace injection pump or repair it.
Air filter element clogged - Clean or change the filter.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine stalls after running |
Fuel injection timing is wrong - Use the correct fuel injection pump timing adjustment.
Dirty fuel filter - Change the filter element.
Engine is not preheated - Normalize the temperature by warming up the engine.
Injection nozzles are burnt or jammed - Clean or replace injection nozzles.
Low idle speed setting is incorrect - Correct low idle settings.
The valve clearance is incorrect - Adjust to proper valve clearance.
Fuel injection pump damage - Repair or install a new fuel pump.
Dirty or faulty injection nozzles - Test injection nozzles and change if necessary.
Fuel lines or hoses are dirty - Clean fuel system hoses and lines.
Plugged air filter - Clean or change the filter.
Worn cylinder head gasket - Install new cylinder head gasket.
Injection timing is wrong - Use correct injection timing adjustment.
Fuel injection pump is faulty - Repair or change injection pump.
One of moving engine parts has broken - Repair or replace defective parts.
Radiator core is clogged or radiator cap is leaking - Change cap or clean radiator.
Not enough coolant - Fill the cooling system and check components for leaks or other faults.
Fan belt is broken or worn - Change the fan belt.
Engine oil level low - Checking oil level and add if necessary.
Leaking cylinder head gasket - Gasket should be replaced.
Injection timing is incorrect - Adjust injection timing as required.
| Oil pressure is insufficient |
Insufficient engine oil - Check and refill the oil.
Defective oil pump - Check and replace if necessary.
Plugged engine oil filter - Clean or change engine oil filter.
Relief valve is defective or dirty - Replace or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Check and replace or repair defective parts.
| Diesel engine using too much oil |
Oil leaking: Gaskets or seals can be faulty - Replace defective parts.
Improper oil viscosity - Use oil of correct viscosity.
Seized or wear piston rings - Install new piston rings.
Valve stems or guides are damaged - Install new valves.
Scuffed pistons or cylinder liners - Check liners and pistons, change as required.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Insufficient engine oil - Check oil level and add oil as required.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Pistons are scored or worn - Have pistons replaced.
Misaligned or defective connecting rod - Connecting rod must be aligned or replaced.
| Starter motor cranks slow |
Low battery power - Recharge the battery.
Battery discharges quickly - Service charging system or replace battery.
Disconnected cables or faulty battery terminals - Connect cables properly or replace terminals.
Battery is low or faulty - Recharge or change battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery power - Battery is drained, recharge it.
Damaged starter motor - Repair or install a new starter.
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