John Deere 4039D Troubleshooting
| Engine Model: John Deere 4039D |
| Engine Type: 4-cycle inline 4-cylinder direct injection liquid-cooled diesel |
| Total Displacement: 239 cu.in (3.9 L) |
| Rated Engine Power: 50-80 Hp (37-60 kW) at 2500 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine hard to start or won't start |
Fuel filter plugged - Clean or replace the filter.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Fuel injection pump malfunctioning - Change pump or rebuild it.
Wrong valve timing - Adjust or change timing gear.
Restricted fuel pipes - Clean or change fuel pipes.
Wrong injection timing - Check injection timing adjustment.
Damaged piston rings and cylinder - Replace defective components.
| Diesel starts and stalls immediately |
Clogged fuel filter - Install new filter element.
Fuel injection pump malfunctioning - Rebuild or install a new injection pump.
Air filter plugged - Replace air filter element.
Unadjusted nozzle opening pressure - Adjust as required.
| Diesel shuts off while driving |
Fuel injection timing is not adjusted - Set up as recommended.
Clogged fuel filter - Clean the filter or install new filter element.
Low coolant temperature - Normalize the temperature by warming up the engine.
Injection nozzles are burnt or jammed - Clean or replace injection nozzles.
Incorrect low idle setting - Adjust the low idle speed.
Valve clearance is out of adjustment - Have it adjusted.
Fuel injection pump malfunctioning - Change pump or rebuild it.
| Diesel engine is losing power |
Clogged or defective injection nozzles - Replace injection nozzles.
Restricted fuel lines or hoses - Service fuel lines and hoses.
Intake air restriction - Replace air filter element.
Damaged cylinder-head gasket - Change cylinder head gasket.
Incorrect injection timing - Adjust injection timing as required.
Fuel injection pump is broken - Repair or install new pump.
One of moving engine parts is faulty - Repair or replace defective components.
Clogged radiator fins or leaking radiator cap - Clean radiator or install new cap.
Coolant level is low - Top up coolant fluid and check system for leaks.
Broken or loose fan belt - Replace as required.
Lack of engine oil - Fill up the engine oil.
Cylinder-head gasket is broken - Replace cylinder head gasket.
Injection timing is incorrect - Set up as recommended.
Low oil level - Fill up the engine oil.
Worn oil pump - Repair or change.
Oil filter clogged - Replace or clean engine oil filter element.
Stuck or worn relief valve - Change or service relief valve.
Excessive crankshaft bearing clearance - Test and replace or repair worn components.
Excessive oil clearance of crankpin bearing - Test and repair or replace worn parts.
| Engine consuming too much oil |
Oil leaking: Worn gaskets or seals - Replace worn parts to avoid leaks.
Oil viscosity is incorrect - Fill up with the proper oil viscosity.
Damaged or seized piston rings - Change piston rings.
Valve stems or guides are damaged - Change the valves.
Pistons or cylinder liners are scuffed - Inspect liners and pistons, replace as necessary.
| Abnormal engine knocking or noise |
Engine has not warmed up to the recommended temperature - Warm up the engine.
Lack of engine oil - Check and refill engine oil.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.
Pistons are worn or scored - Have pistons replaced.
Faulty or misaligned connecting rod - Connecting rod needs to be replaced or aligned.
Low battery power - Battery is drained, charge it.
Battery won’t hold charge - Service battery or replace it.
Battery terminals are corroded or wires are disconnected - Check wiring and clean or replace terminals.
Battery is drained or defective - Recharge or change battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery output voltage - Battery is drained, recharge it.
Defective starter motor - Change or repair starter.
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