Yanmar 3TN75 Troubleshooting
| Engine Model: Yanmar 3TN75 |
| 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 doesn't start |
Dirty fuel filter - Replace the filter element.
Air trapped in fuel system - Bleed air.
Faulty or dirty injection nozzles - Replace injection nozzles.
Damaged fuel injection pump - Install a new pump or rebuild.
Unadjusted valve timing - Set the valve timing correctly.
Fuel pipes are dirty - Clean or replace fuel pipes.
Injection timing is incorrect - Adjust according to specifications.
Piston rings and cylinder are worn - Change defective components.
Fuel filter plugging - Clean the filter element.
Fuel injection pump is faulty - Repair or replace injection pump.
Dirty air filter - Install new air filter element.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine stops running suddenly |
Fuel injection timing is wrong - Adjust the pump as required.
Fuel filter plugged - Clean the filter element.
Engine is cold - Warm up to required temperature.
Injection nozzles are stuck or clogged - Clean or replace injection nozzles.
Too low idle RPM - Adjust the low idle speed.
Excessive valve clearance - Check and adjust.
Defective fuel injection pump - Repair or install new pump.
Damaged or dirty injection nozzles - Replace injection nozzles.
Dirty fuel lines or hoses - Service fuel hoses and lines.
Clogged air filter - Clean or replace element.
Cylinder head gasket is blown - Change cylinder head gasket.
Unadjusted injection timing - Use correct injection timing adjustment.
Fuel injection pump is broken - Replace or rebuild injection pump.
Any of moving engine components is faulty - Repair or replace defective components.
Clogged radiator core or leaking radiator cap - Clean radiator or replace cap.
Insufficient coolant - Add coolant fluid to cooling system and also check it for leaks.
Broken or loose fan belt - Change the fan belt.
Insufficient engine oil - Fill up the oil to required level.
Cylinder-head gasket is leaking - Replace cylinder head gasket.
Improper injection timing - Adjust according to specifications.
Not enough oil in the engine - Check and refill the oil.
Oil pump failure - Repair or replace.
Oil filter is dirty - Clean or replace engine oil filter element.
Stuck or worn relief valve - Replace or service relief valve.
Crankshaft bearing clearance is excessive - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Check and change or repair defective parts.
| Diesel engine consuming too much oil |
Oil leakage: Seals or gaskets are defective - New components need to be installed.
Improper oil viscosity - Fill up with the proper oil viscosity.
Piston rings are stuck or worn - Have piston rings replaced.
Valve guides or stems are damaged - Install new valves.
Cylinder liners or pistons are worn - Inspect pistons and liners, replace as required.
Coolant temperature is low - Warm up to required temperature.
Engine oil level is insufficient - Checking oil level and add if necessary.
Fuel injection pump timing is wrong - Adjust as recommended.
Pistons are scored or worn - Pistons need to be replaced.
Faulty or misaligned connecting rod - Connecting rod needs to be aligned or changed.
Low battery power - Charge the battery.
Battery discharges quickly - Battery needs service or replacement.
Corroded battery terminals or disconnected wires - Check wire connections and change or service terminals.
Battery is discharged or defective - Replace or charge as required.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery output voltage - Recharge the battery.
Starter motor failing - Repair or replace starter.
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