Yanmar 3TNV80F Troubleshooting
| Engine Model: Yanmar 3TNV80F |
| Engine Type: 4-cycle vertical 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 77.2 cu.in (1.27 L) |
| Rated Engine Power: 22.5 Hp (16.7 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Diesel hard to start or doesn't start |
Fuel filter plugging - Filter maintenance required.
Air in the fuel system - Air bleeding.
Defective injection nozzle - If necessary, replace with a new nozzle.
Fuel injection pump is not working correctly - Replacement or repair required.
Valve timing is improper - Adjust or replace timing gear.
Restricted fuel pipes - Service or change fuel pipes.
Improper injection timing - Adjust injection timing as required.
Cylinder or piston rings are worn - Replace defective components.
| Engine stalls after starting |
Clogged fuel filter - Change the filter element.
Fuel injection pump failure - Replacement or repair required.
Air filter element clogged - Clean or change.
Nozzle opening pressure is incorrect - Set it correctly.
| Engine shuts off suddenly during operation |
Improper fuel injection timing - Adjust as recommended.
Fuel filter element is clogged - Change filter element.
Engine is not fully warmed up - Warm up the engine.
Injection nozzles sticking or clogged - Clean or change injection nozzles.
| Engine stalls at low idle speed |
Low idle speed set incorrectly - Test and adjust.
Valve clearance is out of adjustment - Adjust to proper valve clearance.
Fuel injection pump malfunctioning - Repair or replace injection pump.
Fuel injection nozzles are damaged or dirty - Test injection nozzles and change if necessary.
Dirty fuel lines or hoses - Service fuel lines and hoses.
Plugged air filter - Replace air filter element.
Worn cylinder head gasket - Install new cylinder head gasket.
Unadjusted injection timing - Check injection timing adjustment.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.
One of moving engine components has failed - Repair or replace defective parts.
Damaged radiator cap or dirty radiator core - Change cap or clean radiator.
Insufficient coolant - Fill radiator to proper level and check components for faults.
Loose or defective fan belt - Replace the fan belt.
Low engine oil level - Fill up the engine oil.
Blown cylinder head gasket - Install new cylinder head gasket.
Improper injection timing - Use correct injection timing adjustment.
Engine oil level low - Fill crankcase to proper oil level.
Worn oil pump - Install a new pump.
Clogged oil filter - Change or service engine oil filter.
Relief valve is stuck or worn - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Check and replace or repair defective parts.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty components.
Oil leakage: Gaskets or seals may be damaged - Install new components.
Crankcase oil too light - Use correct viscosity oil.
Piston rings are defective or worn - Replace piston rings.
Valve stems and guides are worn - Valves must be replaced.
Cylinder liners or pistons are scuffed - Check pistons and liners, replace as required.
Coolant temperature is low - Warm up to required temperature.
Low engine oil level - Fill up the engine oil.
Incorrect adjustment of fuel injection pump timing - Set up as recommended.
Pistons are worn or scored - Have pistons replaced.
Connecting rod is worn or not aligned - Alignment procedure or replacement is required.
Battery capacity is low - Battery is drained, charge it.
Battery discharges quickly - Service charging system or change battery.
Corroded battery terminals or disconnected wires - Check cable connections and replace or service terminals.
| Starter motor is not working |
Battery is drained or defective - Charge or change the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output voltage - Battery is drained, recharge it.
Starter motor failing - Starter should be replaced.
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