John Deere 6068TFM76 Troubleshooting
| Engine Model: John Deere PowerTech 6068TFM76 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 154-225 Hp (115-168 kW) at 2300-2600 rpm |
| Fuel System Type: Direct Injection |
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| Engine starts hard or won't start |
Fuel filter element is clogged - Change filter element.
Air in fuel tank - Bleed fuel tank.
Fuel injection nozzles are faulty or clogged - Service or change injection nozzles.
Damaged fuel injection pump - Change or repair the pump.
Improper valve timing - Set the valve timing correctly.
Restricted fuel pipes - Service or change fuel pipes.
Injection timing is out of adjustment - Check injection timing adjustment.
Damaged piston rings and cylinder - Replace defective components.
| Engine stalls after starting |
Dirty fuel filter - Clean the filter element.
Fuel injection pump is defective - Change pump or rebuild it.
Air filter is clogged - Clean or replace element.
Incorrect nozzle opening pressure - Set it correctly.
| Diesel shuts off while driving |
Fuel injection timing is not adjusted - Adjust the pump as required.
Dirty fuel filter - Filter maintenance required.
Engine is not preheated - Normalize the temperature by warming up the engine.
Injection nozzles are jammed or clogged - Change or repair injection nozzles.
Incorrect low idle setting - Correct low idle settings.
The valve clearance is not adjusted - Adjustment procedure required.
Fuel injection pump is damaged - Rebuild or replace pump.
Clogged or burnt injection nozzle - Service or change injection nozzles.
Dirt in the fuel hoses or lines - Clean fuel system lines and hoses.
Air filter is clogged - Service or replace the air filter.
Cylinder head gasket is blown - Replace cylinder head gasket.
Unadjusted injection timing - Adjust according to specifications.
Fuel injection pump is faulty - Change or repair the pump.
One of moving engine parts is faulty - Replace or repair damaged components.
Radiator core is clogged or radiator cap is leaking - Replace cap or clean radiator.
Engine coolant is insufficient - Fill radiator to proper level and check components for faults.
Damaged or worn fan belt - Belt replacement is recommended.
Low engine oil level - Check oil level and add oil as required.
Leaking cylinder head gasket - Change cylinder head gasket.
Injection timing is incorrect - Adjust injection timing as required.
| Insufficient oil pressure |
Lack of oil - Add oil as required.
Oil pump is worn or damaged - Replace as required.
Oil filter is dirty - Clean or change engine oil filter.
Relief valve is seized or worn - Replace or service 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.
| Engine oil consumption is too high |
Oil leaking: Worn seals or gaskets - Change to repair leaks.
Wrong oil viscosity - Use correct viscosity oil.
Piston rings are defective or worn - Replace piston rings.
Damaged valve stems or valve guides - Replace the valves.
Cylinder liners or pistons are worn - Inspect liners and pistons, change as necessary.
Engine is not warmed up to the required temperature - Engine is not warmed up to the required temperature.
Engine oil level is insufficient - Check and refill engine oil.
Improper setting of fuel injection pump timing - Adjust the pump as required.
Broken or worn pistons - Install new pistons.
Connecting rod is defective or misaligned - Align or change connecting rod.
Low battery capacity - Battery is drained, recharge it.
Battery won’t hold charge - Service charging system or change battery.
Wires are disconnected or battery terminals are corroded - Check wiring connections and replace or clean terminals.
Battery is drained or defective - Charge or change the battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery output - Battery is drained, recharge it.
Starter motor failure - Repair or replace starter.
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