John Deere 6068TF220 Troubleshooting
| Engine Model: John Deere 6068TF220 |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 146-161 Hp (109-120 kW) at 1500 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine hard to start or will not start |
Fuel filter element is dirty - Filter maintenance required.
Air in fuel tank - Bleed fuel tank.
Faulty fuel injection nozzles - Check and replace nozzles if required.
Faulty fuel injection pump - Replace or rebuild injection pump.
Improper valve timing - Adjust or change timing gear.
Fuel pipes are clogged - Clean fuel pipes.
Injection timing is incorrect - Adjust injection timing as required.
Damaged piston rings and cylinder - Change faulty components.
Fuel filter plugged - Install new filter element.
Fuel injection pump is faulty - Change pump or rebuild it.
Intake air restriction - Clean or change the filter.
Incorrect nozzle opening pressure - Adjust as recommended.
| Engine stops suddenly during operation |
Improper setting of fuel injection pump timing - Check the fuel injection pump timing adjustment.
Fuel filter element is dirty - Clean the filter element.
Engine has not warmed up to the recommended temperature - Normalize the temperature by warming up the engine.
Stuck or clogged injection nozzle - Change or repair injection nozzles.
Too low idle RPM - Adjust low idle speed.
Improper valve clearance - Correct valve clearance needs to be set.
Fuel injection pump is damaged - Change or repair the pump.
| Engine power is insufficient |
Faulty or dirty injection nozzles - Check and replace nozzles if required.
Restricted fuel hoses or lines - Fuel lines and hoses need to be cleaned.
Air filter is clogged - Install new air filter element.
Cylinder head gasket is defective - Install new cylinder head gasket.
Wrong injection timing - Adjust as recommended.
Fuel injection pump failure - Replace or repair injection pump.
Any of moving engine parts is worn - Change or repair damaged parts.
Dirty radiator core or defective radiator cap - Clean radiator or change cap.
Low coolant level - The cooling system needs to be refilled and checked for faults.
Fan belt slipping or worn - Belt replacement is recommended.
Lack of engine oil - Add oil to the engine crankcase.
Cylinder-head gasket is broken - Cylinder-head gasket replacement required.
Injection timing is wrong - Set up as recommended.
| Insufficient oil pressure |
Low oil level - Check and refill the oil.
Oil pump is defective - Repair or change.
Oil filter element clogged - Replace or service engine oil filter.
Stuck or worn relief valve - Change or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty parts.
Excessive crankpin bearing clearance - Check and change or repair defective parts.
| High engine oil consumption |
Oil leaking: Worn gaskets or seals - Replace worn parts to avoid leaks.
Incorrect oil viscosity - Use proper viscosity oil.
Stuck or defective piston rings - Have piston rings replaced.
Valve stems and guides are worn - Replace the valves.
Scuffed cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary.
Engine is not preheated - Normalize the temperature by warming up the engine.
Low engine oil level - Fill up the engine oil.
Incorrect adjustment of fuel injection pump timing - Set it up as required.
Scored or worn pistons - Have pistons replaced.
Connecting rod is misaligned or defective - Align or replace connecting rod.
Low battery power - Battery needs to be recharged.
Battery runs out quickly - Service charging system or install new battery.
Terminals are faulty or battery cables are disconnected - Connect wires properly or change terminals.
Battery is low or faulty - Charge or replace the battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Battery power is low - Battery is drained, recharge it.
Starter motor failing - Repair or replace starter.
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