Yanmar 3TN75RJ Troubleshooting
| Engine Model: Yanmar 3TN75RJ |
| Engine Type: 4-cycle 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 60.7 cu.in (0.99 L) |
| Rated Engine Power: 24 Hp (17.9 kW) at 3300 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts hard or will not start |
Fuel filter element clogging - Install new filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are damaged - Clean or change injection nozzles.
Fuel injection pump is broken - Replace or rebuild injection pump.
Unadjusted valve timing - Use correct valve timing adjustment.
Fuel pipes are plugged - Service or replace fuel pipes.
Improper injection timing - Adjust injection timing as required.
Cylinder or piston rings are worn - Replace faulty components.
| Engine stalls after starting |
Dirty fuel filter - Replace the filter element.
Fuel injection pump is not working correctly - Install a new fuel pump or repair.
Plugged air cleaner - Carry out maintenance on air filter.
Nozzle opening pressure is improper - Adjust as required.
| Engine stops unexpectedly during operation |
Wrong setting of fuel injection pump timing - Set the fuel pump timing correctly.
Fuel filter plugging - Filter maintenance required.
Engine is cold - Normalize the temperature by warming up the engine.
Injection nozzles sticking or clogged - Repair or change injection nozzles.
Low idle speed set incorrectly - Correct the settings.
The valve clearance is not adjusted - Need to adjust valve clearance.
Fuel injection pump is defective - Replace or repair injection pump.
Clogged or defective injection nozzles - Test injection nozzles and change if necessary.
Fuel lines or hoses are dirty - Fuel hoses and lines must be clean.
Plugged air cleaner - Clean or replace element.
Cylinder-head gasket is broken - Replace the gasket as required.
Injection timing is incorrect - Check injection timing adjustment.
Fuel injection pump malfunctioning - Repair or change injection pump.
Any of moving engine parts is worn - Replace or repair damaged components.
Dirty radiator core or defective radiator cap - Install new cap or clean radiator.
Engine coolant is insufficient - Add coolant fluid to cooling system and also check it for leaks.
Damaged or worn fan belt - Install new fan belt.
Low engine oil level - Checking oil level and add if necessary.
Cylinder-head gasket is leaking - Install a new gasket.
Injection timing is improper - Adjust injection timing as required.
| Insufficient oil pressure |
Insufficient engine oil - Add oil to the engine crankcase.
Oil pump is defective - Check and replace if necessary.
Clogged oil filter - Replace or service engine oil filter.
Relief valve is seized or worn - Replace or service relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty parts.
Excessive oil clearance of crankpin bearing - Test and repair or replace worn parts.
Oil leaks: Seals or gaskets are wearing excessively - Replace to repair leaks.
Oil viscosity is wrong - Use oil of proper viscosity.
Seized or wear piston rings - Have piston rings replaced.
Valve stems or guides are damaged - Install new valves.
Pistons or cylinder liners are scuffed - Check pistons and liners, install new parts as required.
Engine is cold - Warm up to required temperature.
Not enough engine oil - Check and refill engine oil.
Wrong setting of fuel injection pump timing - Set the fuel pump timing correctly.
Broken or worn pistons - Pistons replacement required.
Connecting rod is not aligned or worn - Connecting rod needs to be aligned or changed.
Low battery voltage - Charge the battery.
Battery is draining quickly - Service battery or replace it.
Disconnected wires or corroded battery terminals - Check wire connections and change or service terminals.
Battery is discharged or defective - Charge or change the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery voltage is low - Low battery charging, charge as required.
Starter motor is faulty - Repair or replace starter.
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