Yanmar 3TN84RJ Troubleshooting
| Engine Model: Yanmar 3TN84RJ |
| Engine Type: 4-cycle 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 87.2 cu.in (1.43 L) |
| Rated Engine Power: 33.5 Hp (24.9 kW) at 3400 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine hard to start or will not start |
Dirty fuel filter - Change filter element.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are faulty or clogged - If necessary, replace with a new nozzle.
Defective fuel injection pump - Repair or replace injection pump.
Improper valve timing - Correct or change timing gear.
Dirty fuel pipes - Clean or replace fuel pipes.
Improper injection timing - Adjust injection timing as required.
Cylinder or piston rings are worn - Change faulty parts.
| Engine starts but stalls immediately |
Clogged fuel filter - Change filter element.
Fuel injection pump damage - Repair or replace injection pump.
Air filter element clogged - Clean or change.
Nozzle opening pressure is improper - Adjust as recommended.
| Engine stops suddenly during operation |
Wrong setting of fuel injection pump timing - Adjust the pump as required.
Fuel filter plugged - Change filter element.
Coolant temperature is low - Normalize the temperature by warming up the engine.
Stuck or clogged injection nozzle - Repair or replace injection nozzles.
Low idle speed set incorrectly - Correct the settings.
Valve clearance is not correct - Check and adjust.
Fuel injection pump is not operating properly - Replace injection pump or repair it.
| Engine power is insufficient |
Clogged or defective injection nozzles - If necessary, replace with a new nozzle.
Fuel lines or hoses clogging - Clean fuel hoses and lines.
Dirty air cleaner - Replace air filter element.
Cylinder head gasket is defective - Gasket should be replaced.
Unadjusted injection timing - Adjust injection timing as required.
Fuel injection pump is damaged - Change or repair the pump.
One of moving engine parts has broken - Replace or repair damaged components.
Radiator fins are dirty or radiator cap is defective - Replace cap or clean radiator.
Lack of engine coolant - Fill the cooling system and check components for leaks or other faults.
Loose or defective fan belt - Replace the fan belt.
Lack of engine oil - Add oil to the engine crankcase.
Leaking cylinder head gasket - Cylinder-head gasket replacement required.
Incorrect injection timing - Set up as recommended.
Low crankcase oil level - Check and refill the oil.
Oil pump is worn or damaged - Check and replace if necessary.
Oil filter element clogged - Change or service engine oil filter.
Stuck or defective relief valve - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Inspect and replace or repair faulty components.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty components.
| Engine using too much oil |
Oil leaks: Gaskets or seals are excessively worn - To repair leaks, replace worn parts.
Oil viscosity is incorrect - Fill up with the proper oil viscosity.
Worn or stuck piston rings - Replace piston rings.
Valve stems or guides are damaged - Change the valves.
Worn pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
Coolant temperature is low - Warm up engine as required.
Engine oil level is low - Need to add engine oil.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.
Pistons are broken or worn - Install new pistons.
Connecting rod misalignment or failure - Align or change connecting rod.
Low battery voltage - Battery needs to be recharged.
Battery will not hold charge - Service battery or replace it.
Wires are disconnected or battery terminals are corroded - Connect wires correctly or change terminals.
Battery is drained or worn - Replace or charge as required.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery voltage is low - Low battery charging, charge as required.
Starter motor failing - Starter needs to be replaced.
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