Yanmar 3TNA72 Troubleshooting
| Engine Model: Yanmar 3TNA72 |
| Engine Type: 4-cycle 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 53.6 cu.in (0.88 L) |
| Rated Engine Power: 16.4 Hp (22 kW) at 3600 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine difficult to start or won't start |
Clogged fuel filter - Clean or change the filter.
Air in the fuel system - Air bleeding.
Dirty or faulty injection nozzles - Change fuel injection nozzles.
Defective fuel injection pump - Replace or repair injection pump.
Unadjusted valve timing - Correct or replace timing gear.
Fuel pipes are plugged - Service fuel pipes.
Incorrect injection timing - Use correct injection timing adjustment.
Damaged piston rings and cylinder - Replace faulty parts.
| Engine starts and then shuts off |
Fuel filter plugging - Install new filter element.
Fuel injection pump is not operating properly - Change pump or rebuild it.
Clogged air filter - Change air filter element.
Improper nozzle opening pressure - Set up as recommended.
| Engine stops running suddenly |
Fuel injection timing is not adjusted - Set up as recommended.
Fuel filter plugging - Install new filter element.
Coolant temperature is low - Warm up to required temperature.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
Low idle speed adjustment is incorrect - Correct low idle adjustment.
Valve clearance is wrong - Adjustment procedure required.
Damaged fuel injection pump - Repair or replace injection pump.
Fuel injection nozzles fault - Check injection nozzles and replace if required.
Clogged fuel hoses or lines - Clean fuel system lines and hoses.
Plugged air filter - Air filter maintenance required.
Cylinder head gasket is defective - Replace the gasket as required.
Incorrect injection timing - Set up as recommended.
Fuel injection pump is faulty - Replace injection pump or repair it.
Any of moving engine parts is worn - Repair or replace defective components.
Clogged radiator fins or leaking radiator cap - Change cap or clean radiator.
Coolant level is low - Fill the cooling system and check components for leaks or other faults.
Fan belt slipping or worn - Belt replacement is recommended.
Engine oil level is insufficient - Check and refill engine oil.
Leaking cylinder head gasket - Cylinder-head gasket replacement required.
Injection timing is wrong - Adjust as recommended.
Engine oil insufficient - Check and refill the oil.
Oil pump malfunction - Repair or replace.
Oil filter clogged - Clean or change engine oil filter.
Stuck or worn relief valve - Change or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
| Diesel engine using too much oil |
Oil leaks: Worn seals or gaskets - Replace to repair leaks.
Crankcase oil too light - Use proper viscosity oil.
Seized or wear piston rings - Piston rings replacement required.
Valve guides and stems are worn - Install new valves.
Worn pistons or cylinder liners - Inspect pistons and liners, fit new components as necessary.
Coolant temperature is low - Warm up engine as required.
Engine oil level is insufficient - Fill up the oil to required level.
Fuel injection pump timing is not adjusted - Adjust fuel injection pump as required.
Worn or broken pistons - Pistons replacement required.
Connecting rod is misaligned or worn - Need to replace or align the connecting rod.
Low battery power - Battery is drained, recharge it.
Battery drains quickly - Service battery or change it.
Terminals are faulty or battery cables are disconnected - Connect cables correctly or replace terminals.
Battery is low or faulty - Charge or replace the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output - Battery needs to be recharged.
Starter motor is damaged - Replace or repair starter.
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