Yanmar 4TNV106 Troubleshooting
| Engine Model: Yanmar 4TNV106 |
| Engine Type: 4-cycle 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 269.2 cu.in (4.41 L) |
| Rated Engine Power: 90.7 Hp (67.6 kW) at 2500 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts hard or doesn't start |
Fuel filter plugged - Change the filter element.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are damaged or dirty - Clean or change injection nozzles.
Fuel injection pump failure - Change pump or rebuild it.
Unadjusted valve timing - Use correct valve timing adjustment.
Clogged fuel pipes - Service or replace fuel pipes.
Unadjusted injection timing - Set up as recommended.
Damaged piston rings and cylinder - Change faulty parts.
| Engine starts but stalls suddenly |
Clogged fuel filter - Filter maintenance required.
Fuel injection pump is not operating properly - Replace or repair injection pump.
Air filter plugged - Service or replace the air filter.
Nozzle opening pressure is improper - Adjust according to specifications.
| Engine stops suddenly during operation |
Wrong setting of fuel injection pump timing - Set up as recommended.
Fuel filter plugging - Change the filter element.
Low coolant temperature - Warm up the engine.
Defective or stuck injection nozzles - Repair or replace injection nozzles.
Incorrect low idle speed adjustment - Correct the settings.
Improper valve clearance - Have it adjusted.
Faulty fuel injection pump - Repair or install new pump.
Faulty fuel injection nozzles - Change fuel injection nozzles.
Fuel hoses or lines clogging - Fuel lines and hoses need to be cleaned.
Air filter is clogged - Service air cleaner.
Cylinder-head gasket is broken - Change cylinder head gasket.
Wrong injection timing - Use correct injection timing adjustment.
Fuel injection pump malfunctioning - Rebuild or replace pump.
One of moving engine components has failed - Replace or repair damaged components.
Radiator fins are clogged or radiator cap is faulty - Install new cap or clean radiator.
Insufficient coolant fluid - The cooling system needs to be refilled and checked for faults.
Loose or damaged fan belt - If necessary, replace the belt.
Engine oil insufficient - Check oil level and add oil as required.
Cylinder head gasket defective - Install a new gasket.
Improper injection timing - Adjust injection timing as required.
| Insufficient oil pressure |
Oil level is insufficient - Add oil as required.
Defective oil pump - Inspect and change as required.
Oil filter clogging - Change or clean engine oil filter element.
Relief valve is stuck or broken - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Check and replace or repair defective parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Excessive engine oil consumption |
Oil leakage: Damaged seals or gaskets - Replace to repair leaks.
Oil viscosity is incorrect - Use proper viscosity oil.
Stuck or defective piston rings - Piston rings need to be replaced.
Valve stems and guides are worn - Valves need to be changed.
Scuffed pistons or cylinder liners - Inspect liners and pistons, fit new parts as necessary.
Engine is not preheated - Warm up the engine.
Low engine oil level - Add oil to the engine crankcase.
Fuel injection pump timing is not adjusted - Set the fuel pump timing correctly.
Worn or broken pistons - Replace the pistons as required.
Misaligned or faulty connecting rod - Alignment procedure or replacement is required.
Low battery output voltage - Battery is drained, charge it.
Battery discharges quickly - Service battery or change it.
Disconnected cables or faulty battery terminals - Connect wires properly or change terminals.
Battery is discharged or defective - Charge or change the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery power - Battery is drained, charge it.
Damaged starter motor - Starter needs to be replaced.
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