John Deere 4039T Troubleshooting
| Engine Model: John Deere 4039T |
| Engine Type: 4-cycle inline 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 239 cu.in (3.9 L) |
| Rated Engine Power: 75-100 Hp (55-74 kW) at 2500 rpm |
| Aspiration Type: Turbocharged |
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| Engine starts hard or won't start |
Dirty fuel filter - Install new filter element.
Air in the fuel system - Air bleeding.
Clogged or defective injection nozzles - Inspect nozzles and replace if necessary.
Fuel injection pump malfunctioning - Install a new pump or rebuild.
Wrong valve timing - Use correct valve timing adjustment.
Plugged fuel pipes - Service fuel pipes.
Injection timing is out of adjustment - Set the injection timing correctly.
Worn piston rings and cylinder - Change defective parts.
| Diesel starts and then shuts off |
Clogged fuel filter - Filter maintenance required.
Fuel injection pump malfunction - Repair or replace injection pump.
Dirty air cleaner - Clean or replace element.
Unadjusted nozzle opening pressure - Set it correctly.
| Engine shuts off suddenly while running |
Improper fuel injection timing - Use the correct fuel injection pump timing adjustment.
Fuel filter element is dirty - Clean the filter or install new filter element.
Coolant temperature is low - Warm up to required temperature.
Injection nozzles are stuck or clogged - Repair or change injection nozzles.
| Engine stops while idling |
Improperly adjusted low idle speed - Need to adjust idle speed.
The valve clearance is not adjusted - Have it adjusted.
Fuel injection pump failure - Replace or rebuild injection pump.
| Diesel engine loses power |
Defective or clogged injection nozzle - Check and replace nozzles if required.
Clogged fuel hoses or lines - Clean fuel system hoses and lines.
Air filter plugged - Carry out maintenance on air filter.
Damaged cylinder-head gasket - Cylinder-head gasket replacement required.
Injection timing is incorrect - Adjust injection timing as required.
Fuel injection pump is broken - Repair or install new pump.
Any of moving engine parts is worn - Repair or replace defective components.
Defective radiator cap or clogged radiator core - Clean radiator or replace cap.
Engine has a lack of coolant - Add coolant and check the components of cooling system.
Loose or defective fan belt - Replace as required.
Not enough engine oil - Fill the crankcase with engine oil.
Worn cylinder head gasket - Install new cylinder head gasket.
Injection timing is incorrect - Adjust as recommended.
| Oil pressure is insufficient |
Lack of oil - Fill crankcase to proper oil level.
Oil pump malfunction - Remove and inspect oil pump.
Clogged oil filter element - Change or service engine oil filter.
Relief valve is defective or dirty - Change or service relief valve.
Excessive crankshaft bearing clearance - Inspect and change or repair worn components.
Crankpin bearing clearance is excessive - Inspect and change or repair worn components.
| High engine oil consumption |
Oil leakage: Damaged gaskets or seals - Replace to repair leaks.
Incorrect oil viscosity - Use correct viscosity oil.
Piston rings are stuck or broken - Piston rings need to be replaced.
Damaged valve stems or valve guides - Valves need to be changed.
Scored cylinder liners or pistons - Inspect liners and pistons, replace as necessary.
Coolant temperature is low - Warm up engine as required.
Lack of engine oil - Fill the crankcase with engine oil.
Improper fuel injection timing - Set it up as required.
Worn or broken pistons - Pistons need to be replaced.
Connecting rod is defective or not aligned - Align or replace connecting rod.
Low battery voltage - Recharge the battery.
Battery does not hold charge - Service charging system or change battery.
Disconnected wires or corroded battery terminals - Check cable connections and change or clean terminals.
Battery is drained or defective - Recharge or replace battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery capacity - Recharge the battery.
Starter motor failing - Starter should be replaced.
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