John Deere 6068HFG20 Troubleshooting
| Engine Model: John Deere PowerTech M 6068HFG20 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 223-282 Hp (166-210 kW) at 1500-1800 rpm |
| Fuel System Type: Direct Injection |
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| Engine starts hard or doesn't start |
Fuel filter element is dirty - Replace the filter element.
Air trapped in fuel system - Bleed air.
Dirty or faulty injection nozzles - Service or change injection nozzles.
Damaged fuel injection pump - Repair or change injection pump.
Unadjusted valve timing - Adjust or replace timing gear.
Dirty fuel pipes - Service or change fuel pipes.
Injection timing is improper - Check injection timing adjustment.
Cylinder or piston rings are worn - Replace defective components.
| Engine starts but then stalls |
Fuel filter element is dirty - Clean or replace the filter.
Damaged fuel injection pump - Change pump or rebuild it.
Air cleaner is dirty - Change air filter element.
Nozzle opening pressure is incorrect - Set it correctly.
| Engine stalls after running |
Wrong setting of fuel injection pump timing - Set it up as required.
Fuel filter element is clogged - Clean or replace the filter.
Engine is not preheated - Warm up to required temperature.
Injection nozzles are burnt or jammed - Clean or change injection nozzles.
| Engine stalls at low idle speed |
Too low idle RPM - Correct low idle settings.
Valve clearance is not correct - Check and adjust.
Fuel injection pump is not working correctly - Replace or rebuild injection pump.
Faulty or dirty injection nozzles - Check injection nozzles and replace if required.
Fuel hoses or lines are clogged - Clean fuel system lines and hoses.
Air filter is dirty - Install new air filter element.
Leaking cylinder head gasket - Gasket should be replaced.
Injection timing is incorrect - Adjust according to specifications.
Fuel injection pump is defective - Change pump or rebuild it.
One of moving engine parts is faulty - Change or repair damaged parts.
Clogged radiator core or leaking radiator cap - Replace cap or clean radiator.
Lack of engine coolant - The cooling system needs to be refilled and checked for faults.
Fan belt is loose or defective - Fan belt must be replaced.
Low engine oil level - Need to add engine oil.
Worn cylinder head gasket - Gasket should be replaced.
Injection timing is out of adjustment - Use correct injection timing adjustment.
Not enough oil in the engine - Fill the crankcase with oil.
Oil pump is damaged - Repair or change.
Dirty oil filter element - Service or change engine oil filter element.
Relief valve is defective or dirty - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Check and change or repair defective parts.
Excessive oil clearance of crankpin bearing - Test and repair or replace worn parts.
| High engine oil consumption |
Oil leaks: Worn gaskets or seals - Install new components.
Oil viscosity is incorrect - Use oil of proper viscosity.
Seized or wear piston rings - Install new piston rings.
Valve stems or guides are damaged - Replace the valves.
Damaged cylinder liners or pistons - Inspect pistons and liners, replace as required.
| Abnormal engine noise or knocking |
Engine is cold - Warm up engine as required.
Engine oil level is low - Check and refill engine oil.
Fuel injection pump timing is not adjusted - Set it up as required.
Pistons are scored or worn - Pistons replacement required.
Connecting rod is defective or not aligned - Connecting rod needs to be replaced or aligned.
Low battery output voltage - Battery is drained, charge it.
Battery runs out quickly - Service charging system or install new battery.
Disconnected wiring or bad battery terminals - Check battery wires and service or replace terminals.
Battery is drained or worn - Recharge or change battery.
Battery wiring is disconnected or improperly connected - Inspect wiring and connect as required.
Low battery voltage - Battery needs to be recharged.
Starter motor failure - Repair or change starter.
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