Yanmar 3TNV84 Troubleshooting
| Engine Model: Yanmar 3TNV84 |
| Engine Type: 4-cycle 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 91.3 cu.in (1.49 L) |
| Rated Engine Power: 33 Hp (24.6 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Diesel engine hard to start or doesn't start |
Fuel filter element is dirty - Service or replace the filter.
Air in the fuel lines - Bleed the fuel lines.
Fuel injection nozzles are clogged or faulty - Install a new kit of correctly balanced nozzles.
Fuel injection pump malfunctioning - Change or repair the pump.
Incorrect valve timing - Adjust or change timing gear.
Fuel pipes clogging - Service fuel pipes.
Injection timing is improper - Adjust according to specifications.
Worn cylinder or piston rings - Replace defective components.
| Engine starts but then stalls |
Dirty fuel filter - Replace the filter element.
Damaged fuel injection pump - Replacement or repair required.
Intake air restriction - Clean or change the filter.
Unadjusted nozzle opening pressure - Adjust as required.
| Engine stops suddenly during operation |
Wrong setting of fuel injection pump timing - Set it up as required.
Dirty fuel filter - Clean or change the filter.
Low coolant temperature - Warm up engine as required.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
Incorrectly set low idle speed - Correct low idle settings.
Valve out of adjustment - Check and adjust as required.
Fuel injection pump is not operating properly - Replace or rebuild injection pump.
Clogged or defective injection nozzles - Check and replace nozzles if required.
Restricted fuel hoses or lines - Fuel hoses and lines must be clean.
Dirty air filter - Clean or replace the element.
Cylinder head gasket is blown - Install a new gasket.
Improper injection timing - Adjust injection timing as required.
Fuel injection pump is damaged - Repair or install a new fuel pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Radiator fins are dirty or radiator cap is defective - Change cap or clean radiator.
Insufficient coolant - Top up coolant fluid and check system for leaks.
Fan belt is worn or faulty - Change the fan belt.
Insufficient engine oil - Checking oil level and add if necessary.
Cylinder head gasket is worn - Replace cylinder head gasket.
Wrong injection timing - Set the injection timing correctly.
| Insufficient oil pressure |
Low oil level - Fill the crankcase with oil.
Worn oil pump - Repair or replace.
Oil filter element is dirty - Change or service engine oil filter.
Stuck or defective relief valve - Change or clean relief valve.
Crankshaft bearing clearance is excessive - Inspect and replace or repair faulty components.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty parts.
| Engine oil consumption is too high |
External oil leaks: Seals or gaskets are wearing excessively - Replace worn parts to avoid leaks.
Oil viscosity is incorrect - Use proper viscosity oil.
Stuck or defective piston rings - Have piston rings replaced.
Damaged valve stems or valve guides - Replace defective valves.
Damaged pistons or cylinder liners - Check pistons and liners, replace as required.
Coolant temperature is low - Warm up engine as required.
Engine oil insufficient - Check oil level and add oil as required.
Fuel injection pump timing is wrong - Use the correct fuel injection pump timing adjustment.
Pistons are broken or worn - Pistons replacement required.
Misaligned or defective connecting rod - Connecting rod needs to be aligned or changed.
Low battery capacity - Battery is drained, charge it.
Battery is not holding charge - Battery needs service or replacement.
Corroded battery terminals or disconnected wires - Connect wiring properly or install new terminals.
Battery is discharged or worn - Change or recharge battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery output voltage - Charge the battery.
Damaged starter motor - Starter needs to be replaced.
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