John Deere 6068HFG85 Troubleshooting
| Engine Model: John Deere PowerTech Plus 6068HFG85 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 259-315 Hp (193-235 kW) at 1800 rpm |
| Fuel System Type: Common Rail Direct Injection |
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| Diesel engine hard to start or doesn't start |
Dirty fuel filter - Service or replace the filter.
Air trapped in fuel system - Bleed air.
Clogged or defective injection nozzles - Inspect nozzles and replace if necessary.
Fuel injection pump malfunction - Change or repair the pump.
Incorrect valve timing - Use correct valve timing adjustment.
Clogged fuel pipes - Clean or change fuel pipes.
Incorrect injection timing - Set up as recommended.
Cylinder or piston rings are worn - Change defective components.
| Engine starts but stalls suddenly |
Clogged fuel filter - Replace the filter element.
Fuel injection pump failure - Replace or repair injection pump.
Air filter clogged - Clean or change the filter.
Improper nozzle opening pressure - Adjust as recommended.
| Engine stops unexpectedly during operation |
Wrong setting of fuel injection pump timing - Adjust fuel injection pump as required.
Fuel filter element clogging - Filter maintenance required.
Low coolant temperature - Warm up to required temperature.
Injection nozzles are stuck or clogged - Service or change injection nozzles.
Low idle speed set incorrectly - Test and adjust.
Incorrect valve clearance - Adjust to proper valve clearance.
Damaged fuel injection pump - Repair or install a new fuel pump.
Fuel injection nozzles fault - Check and replace nozzles if required.
Clogged fuel hoses or lines - Clean fuel system lines and hoses.
Clogged air cleaner - Clean or change.
Cylinder head gasket is worn - Change cylinder head gasket.
Injection timing is incorrect - Set up as recommended.
Fuel injection pump malfunctioning - Replace or repair injection pump.
One of moving engine parts has broken - Change or repair damaged parts.
Defective radiator cap or clogged radiator core - Change cap or clean radiator.
Low engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Loose or damaged fan belt - Belt replacement is recommended.
Engine oil level low - Fill up the engine oil.
Cylinder-head gasket is leaking - Install new cylinder head gasket.
Incorrect injection timing - Check injection timing adjustment.
Insufficient engine oil - Check and refill the oil.
Oil pump is worn or damaged - Replace as required.
Plugged engine oil filter - Replace or service engine oil filter.
Relief valve is stuck or broken - Relief valve need to be replaced or cleaned.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty components.
Excessive oil clearance of crankpin bearing - Inspect and change or repair worn components.
| Diesel engine consuming too much oil |
External oil leaks: Damaged gaskets or seals - Change to repair leaks.
Crankcase oil too light - Use oil of correct viscosity.
Worn or broken piston rings - Piston rings replacement required.
Valve guides or stems are damaged - Replace defective valves.
Scored pistons or cylinder liners - Check pistons and liners, replace as required.
Engine is not fully warmed up - Warm up to required temperature.
Engine oil insufficient - Check and refill engine oil.
Timing of fuel injection pump is incorrect - Set up as recommended.
Broken or worn pistons - Pistons need to be replaced.
Connecting rod is not aligned or worn - Align or change connecting rod.
Low battery capacity - Battery is drained, recharge it.
Battery discharges quickly - Service battery or replace it.
Faulty battery terminals or disconnected cables - Connect cables correctly or replace terminals.
Battery is discharged or worn - Charge or change the battery.
Disconnected or incorrectly connected wires - Inspect battery wires and connect correctly.
Low battery capacity - Low battery charging, charge as required.
Starter motor is defective - Repair or install a new starter.
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