Yanmar 3TNV86CT Troubleshooting
| Engine Model: Yanmar 3TNV86CT |
| Engine Type: 4-cycle vertical 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 95.8 cu.in (1.57 L) |
| Rated Engine Power: 44.1 Hp (32.4 kW) at 3000 rpm |
| Aspiration Type: Turbocharged |
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| Diesel hard to start or doesn't start |
Fuel filter element is dirty - Clean the filter element.
Air trapped in fuel system - Bleed air.
Dirty or damaged injection nozzles - Inspect nozzles and replace if necessary.
Faulty fuel injection pump - Change or repair the pump.
Improper valve timing - Use correct valve timing adjustment.
Dirt in the fuel lines or hoses - Service or replace fuel pipes.
Injection timing is incorrect - Adjust as recommended.
Piston rings and cylinder are worn - Change faulty parts.
| Engine stalls after starting |
Fuel filter element is dirty - Change filter element.
Fuel injection pump is not operating properly - Repair or replace injection pump.
Air filter is clogged - Clean or change.
Nozzle opening pressure is incorrect - Adjust as recommended.
| Engine stops running suddenly |
Fuel injection timing is wrong - Set it up as required.
Fuel filter plugging - Clean the filter element.
Engine is cold - Warm up the engine.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
| Engine stalls at low idle speed |
Low idle speed setting is not correct - Normalize low idle speed.
The valve clearance is not adjusted - Adjust valve clearance.
Defective fuel injection pump - Rebuild or change fuel pump.
Dirty or faulty injection nozzles - Replace injection nozzles.
Fuel hoses or lines are dirty - Service fuel lines and hoses.
Air cleaner is dirty - Clean or change the filter.
Defective cylinder head gasket - Install new cylinder head gasket.
Wrong injection timing - Use correct injection timing adjustment.
Fuel injection pump is damaged - Replace injection pump or repair it.
One of moving engine components is worn - Repair or replace defective parts.
Dirty radiator fins or defective radiator cap - Replace cap or clean radiator.
Engine has a lack of coolant - Top up coolant fluid and check system for leaks.
Damaged or worn fan belt - The fan belt needs to be replaced.
Lack of engine oil - Check oil level and add oil as required.
Cylinder head gasket is blown - Cylinder-head gasket replacement required.
Injection timing is incorrect - Use correct injection timing adjustment.
Low crankcase oil level - Checking oil level and add if necessary.
Worn oil pump - Repair or replace.
Engine oil filter is plugged - Service or change engine oil filter element.
Worn or dirty relief valve - Replace or service relief valve.
Excessive oil clearance of crankshaft bearing - Inspect and replace or repair faulty parts.
Clearance of crankpin bearing is excessive - Inspect and change or repair worn components.
| Excessive oil consumption |
Oil leaking: Damaged gaskets or seals - Replace defective parts.
Improper oil viscosity - Use correct viscosity oil.
Damaged or seized piston rings - Piston rings need to be replaced.
Worn valve stems and valve guides - Valves must be replaced.
Pistons or cylinder liners are damaged - Check liners and pistons, install new components as required.
Low coolant temperature - Warm up the engine.
Engine oil level is low - Check and refill engine oil.
Fuel injection pump timing is wrong - Adjust as recommended.
Pistons are worn or broken - Replace the pistons as required.
Faulty or misaligned connecting rod - Connecting rod must be aligned or replaced.
Low battery power - Battery is drained, recharge it.
Battery won’t hold charge - Battery needs service or replacement.
Battery terminals are corroded or wires are disconnected - Connect cables properly or replace terminals.
Battery is drained or worn - Replace or charge as required.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery power - Recharge the battery.
Starter motor is faulty - Repair or change starter.
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