Yanmar 3TNE68 Troubleshooting
| Engine Model: Yanmar 3TNE68 |
| Engine Type: 4-cycle 3-cylinder indirect injection liquid-cooled diesel |
| Total Displacement: 47.8 cu.in (0.78 L) |
| Rated Engine Power: 20.2 Hp (15.1 kW) at 3600 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts hard or doesn't start |
Fuel filter element clogging - Service the filter.
Air trapped in fuel system - Bleed air.
Defective injection nozzle - Clean or change injection nozzles.
Fuel injection pump is damaged - Install a new fuel pump or repair.
Valve timing is out of adjustment - Correct or replace timing gear.
Restricted fuel pipes - Service or change fuel pipes.
Improper injection timing - Use correct injection timing adjustment.
Cylinder or piston rings are worn - Replace faulty components.
| Engine starts but stalls suddenly |
Fuel filter plugged - Clean the filter element.
Fuel injection pump is defective - Replacement or repair required.
Air filter clogged - Clean or change.
Nozzle opening pressure is not adjusted - Set it correctly.
| Engine shuts off while running |
Improper fuel injection timing - Adjust fuel injection pump as required.
Clogged fuel filter - Clean the filter element.
Engine is not preheated - Warm up engine as required.
Injection nozzles are jammed or clogged - Clean or replace injection nozzles.
Low idle speed adjustment is incorrect - Test and adjust.
Incorrect valve clearance - Adjust valve clearance.
Fuel injection pump malfunctioning - Repair or change injection pump.
| Engine is not running at maximum power |
Faulty fuel injection nozzles - Check and replace nozzles if required.
Clogged fuel lines or hoses - Fuel hoses and lines must be clean.
Clogged air filter element - Service air cleaner.
Damaged cylinder-head gasket - Install a new gasket.
Incorrect injection timing - Use correct injection timing adjustment.
Fuel injection pump is damaged - Repair or change injection pump.
One of moving engine parts has broken - Repair or replace defective parts.
Faulty radiator cap or dirty radiator fins - Clean radiator or replace cap.
Lack of engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Excessive wear of the fan belt - Change the fan belt.
Engine oil level low - Fill up the oil to required level.
Leaking cylinder head gasket - Replace cylinder head gasket.
Unadjusted injection timing - Adjust according to specifications.
Engine oil insufficient - Fill crankcase to proper oil level.
Oil pump failure - Install a new pump.
Dirty oil filter element - Change or service engine oil filter.
Stuck or worn relief valve - Replace or service relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty components.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty components.
| Diesel engine using too much oil |
Oil leakage: Gaskets or seals are excessively worn - Defective components must be replaced.
Improper oil viscosity - Use correct viscosity oil.
Stuck or defective piston rings - Piston rings replacement required.
Valve guides and stems are worn - Need to replace the valves.
Pistons or cylinder liners are scuffed - Inspect liners and pistons, fit new parts as necessary.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Low engine oil level - Fill up the oil to required level.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Worn or scored pistons - Replace the pistons.
Connecting rod is defective or misaligned - Align or change connecting rod.
| Starter motor cranks slow |
Battery voltage is low - Charge the battery.
Battery won’t hold charge - Service charging system or install new battery.
Bad battery terminals or disconnected wiring - Check cables and clean or change terminals.
Battery is drained or worn - Charge or change the battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Battery power is low - Battery is drained, charge it.
Damaged starter motor - Repair or replace starter.
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