John Deere 4239T Troubleshooting
| Engine Model: John Deere 4239T |
| Engine Type: 4-stroke in-line 4-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 239 cu.in (3.9 L) |
| Rated Engine Power: 70-102 Hp (52-76 kW) at 1500-2500 rpm |
| Fuel System Type: Direct Injection |
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| Engine starts up hard or doesn't start |
Fuel filter element clogging - Install new filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Faulty or dirty injection nozzles - Clean or change injection nozzles.
Fuel injection pump is damaged - Change pump or rebuild it.
Valve timing is improper - Adjust or change timing gear.
Clogged fuel pipes - Clean or replace fuel pipes.
Injection timing is wrong - Set up as recommended.
Piston rings and cylinder are worn - Change defective components.
| Engine starts and immediately shuts off |
Fuel filter plugged - Change filter element.
Damaged fuel injection pump - Repair or install a new fuel pump.
Clogged air filter element - Air filter maintenance required.
Nozzle opening pressure is not adjusted - Adjust according to specifications.
| Engine stalls after running |
Wrong setting of fuel injection pump timing - Set it up as required.
Dirty fuel filter - Change filter element.
Engine is not preheated - Normalize the temperature by warming up the engine.
Stuck or burnt injection nozzle - Service or change injection nozzles.
| Engine stalls when idling |
Incorrectly adjusted low idle speed - Need to adjust idle speed.
Incorrect valve clearance - Have it adjusted.
Fuel injection pump damage - Install a new pump or rebuild.
| Engine is not running at maximum power |
Clogged or defective injection nozzles - Clean or change injection nozzles.
Fuel hoses or lines are dirty - Clean fuel system hoses and lines.
Dirty air filter element - Install new air filter element.
Cylinder-head gasket is broken - Install a new gasket.
Unadjusted injection timing - Check injection timing adjustment.
Fuel injection pump is defective - Change pump or rebuild it.
Any of moving engine parts is worn - Repair or replace defective parts.
Dirty radiator fins or defective radiator cap - Change cap or clean radiator.
Insufficient coolant - Add coolant fluid and inspect the cooling system for leaks.
Excessive wear of the fan belt - Replace the fan belt.
Low engine oil level - Check oil level and add oil as required.
Cylinder head gasket is damaged - Gasket should be replaced.
Unadjusted injection timing - Check injection timing adjustment.
Not enough oil in the engine - Need to add oil.
Oil pump is damaged - Repair or change.
Engine oil filter is plugged - Service or replace engine oil filter.
Stuck or worn relief valve - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Check and change or repair defective parts.
Crankpin bearing clearance is excessive - Check and replace or repair defective parts.
| Diesel engine consuming too much oil |
External oil leaks: Damaged gaskets or seals - Replace defective parts.
Wrong oil viscosity - Use oil of correct viscosity.
Piston rings are stuck or broken - Have piston rings replaced.
Worn valve stems and valve guides - Install new valves.
Scuffed pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
| Abnormal engine noise or knocking |
Engine has not warmed up to the recommended temperature - Warm up engine as required.
Engine oil insufficient - Check and refill engine oil.
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.
Pistons are worn or broken - Replace the pistons.
Connecting rod misalignment or failure - Need to replace or align the connecting rod.
Low battery voltage - Recharge the battery.
Battery drains quickly - Service charging system or change battery.
Disconnected wiring or bad battery terminals - Check wiring connections and replace or clean terminals.
Battery is low or faulty - Recharge or change battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery power - Recharge the battery.
Defective starter motor - Starter should be changed.
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