Yanmar 4TNE84T Troubleshooting
| Engine Model: Yanmar 4TNE84T |
| Engine Type: 4-cycle vertical 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 121.7 cu.in (1.99 L) |
| Rated Engine Power: 55.3 Hp (41.2 kW) at 3000 rpm |
| Aspiration Type: Turbocharged |
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| Engine difficult to start or doesn't start |
Fuel filter element clogging - Filter maintenance required.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are damaged or dirty - Change fuel injection nozzles.
Fuel injection pump malfunction - Replace or rebuild injection pump.
Unadjusted valve timing - Correct or replace timing gear.
Fuel pipes are dirty - Clean or replace fuel pipes.
Incorrect injection timing - Set the injection timing correctly.
Damaged piston rings and cylinder - Change defective parts.
| Diesel starts but immediately stops |
Fuel filter element is dirty - Replace the filter element.
Fuel injection pump malfunctioning - Replace injection pump or repair it.
Air filter plugged - Clean or replace the element.
Improper nozzle opening pressure - Adjust as recommended.
| Engine stalls after running |
Incorrect adjustment of fuel injection pump timing - Adjust as recommended.
Fuel filter element is clogged - Clean or replace the filter.
Engine is not warmed up to the required temperature - Warm up to required temperature.
Stuck or burnt injection nozzle - Service or change injection nozzles.
| Engine stalls at low idle speed |
Improperly adjusted low idle speed - Adjust the low idle speed.
Improper valve clearance - Check and adjust.
Damaged fuel injection pump - Rebuild or install a new injection pump.
| Engine power is insufficient |
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Fuel hoses or lines are clogged - Fuel lines and hoses need to be cleaned.
Air filter clogged - Carry out maintenance on air filter.
Cylinder-head gasket is broken - Gasket should be replaced.
Injection timing is wrong - Set the injection timing correctly.
Fuel injection pump malfunctioning - Rebuild or change fuel pump.
One of moving engine components is worn - Change or repair damaged parts.
Dirty radiator core or faulty radiator cap - Clean radiator or change cap.
Lack of coolant in cooling system - Top up coolant fluid and check system for leaks.
Fan belt slipping or worn - Install new fan belt.
Lack of engine oil - Checking oil level and add if necessary.
Cylinder head gasket defective - Replace the gasket as required.
Injection timing is wrong - Adjust according to specifications.
Oil level is low - Fill the crankcase with oil.
Oil pump is defective - Inspect and change as required.
Oil filter element is dirty - Change or service engine oil filter.
Relief valve is seized or worn - Change or clean relief valve.
Clearance of crankshaft bearing is excessive - Inspect and replace or repair faulty components.
Excessive crankpin bearing clearance - Inspect and change or repair worn components.
| High engine oil consumption |
Oil leaking: Worn gaskets or seals - Change worn parts according to specifications.
Oil viscosity is incorrect - Fill up with the proper oil viscosity.
Seized or wear piston rings - Piston rings replacement required.
Valve stems and guides are worn - Change the valves.
Scuffed cylinder liners or pistons - Inspect pistons and liners, change as required.
Engine has not warmed up to the recommended temperature - Warm up engine as required.
Not enough engine oil - Checking oil level and add if necessary.
Incorrect adjustment of fuel injection pump timing - Set up as recommended.
Piston wear or scoring - Replace the pistons.
Connecting rod is misaligned or worn - Alignment procedure or replacement is required.
Low battery output voltage - Battery is drained, recharge it.
Battery is not holding charge - Service charging system or replace battery.
Disconnected battery cables or bad terminals - Check cables and clean or change terminals.
Battery is drained or worn - Charge or change the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Battery power is low - Low battery charging, charge as required.
Starter motor failure - Starter should be replaced.
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