Yanmar 2TNE68 Troubleshooting
| Engine Model: Yanmar 2TNE68 |
| Engine Type: 4-cycle 2-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 31.9 cu.in (0.52 L) |
| Rated Engine Power: 11.5 Hp (8.5 kW) at 3000 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts hard or won't start |
Fuel filter plugged - Replace filter element.
Air in fuel tank - Bleed fuel tank.
Faulty or dirty injection nozzles - Test injection nozzles and change if necessary.
Fuel injection pump damage - Replace or rebuild injection pump.
Incorrect valve timing - Set the valve timing correctly.
Plugged fuel pipes - Clean fuel pipes.
Improper injection timing - Adjust as recommended.
Cylinder or piston rings are worn - Change faulty parts.
| Diesel starts but stalls suddenly |
Fuel filter plugging - Replace filter element.
Fuel injection pump damage - Replace or rebuild injection pump.
Plugged air filter - Replace air filter element.
Improper nozzle opening pressure - Set up as recommended.
| Engine shuts off while running |
Incorrect adjustment of fuel injection pump timing - Set it up as required.
Fuel filter element is dirty - Clean the filter element.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Stuck or burnt injection nozzle - Clean or change injection nozzles.
| Engine stalls when idling |
Incorrectly set low idle speed - Test and adjust.
Excessive valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump malfunction - Install a new pump or rebuild.
Faulty fuel injection nozzles - Install a new kit of correctly balanced nozzles.
Fuel hoses or lines are clogged - Service fuel lines and hoses.
Plugged air filter - Clean or change the filter.
Cylinder head gasket is worn - Gasket should be replaced.
Wrong injection timing - Adjust according to specifications.
Fuel injection pump is damaged - Rebuild or replace pump.
One of moving engine components is worn - Repair or replace defective parts.
Dirty radiator fins or faulty radiator cap - Replace cap or clean radiator.
Coolant level is low - Refill to the correct level and inspect system for leaks.
Fan belt is loose or defective - Change the fan belt.
Engine oil level is low - Check oil level and add oil as required.
Worn cylinder head gasket - Install new cylinder head gasket.
Wrong injection timing - Set the injection timing correctly.
Oil level is insufficient - Add oil to the engine crankcase.
Oil pump failure - Replace as required.
Oil filter clogging - Replace or service engine oil filter.
Stuck or worn relief valve - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Diesel engine using too much oil |
Oil leakage: Worn gaskets or seals - Replace defective parts.
Wrong oil viscosity - Use oil of proper viscosity.
Worn or broken piston rings - Piston rings need to be replaced.
Worn valve stems and valve guides - Replace defective valves.
Scored cylinder liners or pistons - Check pistons and liners, change as required.
Engine is not preheated - Warm up engine as required.
Engine oil insufficient - Fill up the engine oil.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Pistons are scored or worn - Have pistons replaced.
Connecting rod is misaligned or worn - Need to change or align the connecting rod.
Low battery output - Battery needs to be recharged.
Battery is not holding charge - Service or change the battery.
Wires are disconnected or battery terminals are corroded - Connect wiring correctly or install new terminals.
Battery is discharged or worn - Recharge or replace battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery voltage - Battery is drained, recharge it.
Defective starter motor - Starter needs to be replaced.
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