Yanmar 3TNV84T Troubleshooting
| Engine Model: Yanmar 3TNV84T |
| Engine Type: 4-cycle 3-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 91.3 cu.in (1.49 L) |
| Rated Engine Power: 41.4 Hp (30.9 kW) at 3000 rpm |
| Aspiration Type: Turbocharged |
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| Engine hard to start or won't start |
Fuel filter plugged - Change filter element.
Air in fuel tank - Bleed fuel tank.
Damaged or dirty injection nozzles - Replace injection nozzles.
Defective fuel injection pump - Rebuild or install a new injection pump.
Improper valve timing - Adjust or change timing gear.
Clogged fuel pipes - Clean or change fuel pipes.
Injection timing is improper - Use correct injection timing adjustment.
Cylinder or piston rings are worn - Change faulty components.
Clogged fuel filter - Change filter element.
Fuel injection pump is defective - Repair or change injection pump.
Air filter element clogged - Change air filter element.
Nozzle opening pressure is not adjusted - Set it correctly.
| Engine shuts off suddenly while running |
Fuel injection timing is not adjusted - Set up as recommended.
Fuel filter element is dirty - Clean or change the filter.
Low coolant temperature - Warm up to required temperature.
Stuck or burnt injection nozzle - Clean or replace injection nozzles.
| Engine stops while idling |
Low idle speed set incorrectly - Correct the settings.
Improper valve clearance - Adjustment procedure required.
Fuel injection pump is broken - Replacement or repair required.
Defective injection nozzle - Service or change injection nozzles.
Fuel lines or hoses are clogged - Clean fuel hoses and lines.
Air filter plugged - Clean or replace element.
Cylinder head gasket is damaged - Gasket should be replaced.
Unadjusted injection timing - Check injection timing adjustment.
Faulty fuel injection pump - Rebuild or install a new injection pump.
One of moving engine parts is faulty - Replace or repair damaged components.
Radiator core is dirty or radiator cap is damaged - Install new cap or clean radiator.
Not enough coolant - Fill radiator to proper level and check components for faults.
Fan belt is worn or faulty - Change the fan belt.
Engine oil insufficient - Fill up the oil to required level.
Cylinder-head gasket is broken - Replace cylinder head gasket.
Injection timing is wrong - Set the injection timing correctly.
Low crankcase oil level - Check and refill the oil.
Worn oil pump - Replace as required.
Clogged oil filter - Clean or change engine oil filter.
Relief valve is defective or dirty - Change or clean relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| High engine oil consumption |
Oil leaking: Gaskets or seals may be damaged - Replace to repair leaks.
Wrong oil viscosity - Fill up with the correct oil viscosity.
Piston rings are seized or worn - Replace piston rings.
Damaged valve guides or valve stems - Install new valves.
Cylinder liners or pistons are worn - Check pistons and liners, change as required.
Engine not warmed up - Warm up engine as required.
Engine oil insufficient - Add oil to the engine crankcase.
Timing of fuel injection pump is incorrect - Adjust according to specifications.
Pistons are worn or broken - Install new pistons.
Connecting rod is misaligned or defective - Alignment procedure or replacement is required.
| Starter motor cranks slow |
Battery power is low - Low battery charging, charge as required.
Battery discharges quickly - Battery needs service or replacement.
Terminals are faulty or battery cables are disconnected - Connect cables correctly or replace terminals.
| Starter motor is not working |
Battery is drained or worn - Recharge or change battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery power - Battery is drained, charge it.
Damaged starter motor - Repair or replace starter.
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