John Deere 6068HF285 Troubleshooting
| Engine Model: John Deere PowerTech Plus 6068HF285 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 187-250 Hp (139-187 kW) at 2000-2400 rpm |
| Fuel System Type: Common Rail Direct Injection |
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| Diesel engine hard to start or doesn't start |
Clogged fuel filter - Clean the filter element.
There is air in the fuel system - Bleed the system.
Dirty or damaged injection nozzles - Change fuel injection nozzles.
Fuel injection pump is not operating properly - Replace or repair injection pump.
Valve timing is improper - Correct or replace timing gear.
Dirty fuel pipes - Service fuel pipes.
Improper injection timing - Adjust as recommended.
Excessive wear of piston rings and cylinder - Change defective parts.
| Engine starts and immediately shuts off |
Dirty fuel filter - Change filter element.
Fuel injection pump damage - Install a new pump or rebuild.
Air filter clogged - Replace air filter element.
Nozzle opening pressure is not adjusted - Adjust as required.
| Engine stalls during operation |
Improper fuel injection timing - Set the fuel pump timing correctly.
Fuel filter plugging - Change filter element.
Low coolant temperature - Warm up to required temperature.
Defective or stuck injection nozzles - Clean or replace injection nozzles.
Wrong adjustment of low idle speed - Correct the settings.
The valve clearance is incorrect - Correct valve clearance.
Fuel injection pump malfunctioning - Replace or rebuild injection pump.
Clogged or defective injection nozzles - Inspect nozzles and replace if necessary.
Fuel hoses or lines are dirty - Clean fuel lines and hoses.
Restricted intake air - Replace air filter element.
Cylinder head gasket is blown - Replace cylinder head gasket.
Injection timing is incorrect - Check injection timing adjustment.
Fuel injection pump is defective - Rebuild or replace pump.
One of moving engine components is worn - Repair or replace defective parts.
Faulty radiator cap or dirty radiator fins - Clean radiator or replace cap.
Lack of coolant in cooling system - Top up coolant fluid and check system for leaks.
Broken or loose fan belt - Install new fan belt.
Lack of engine oil - Add oil to the engine crankcase.
Worn cylinder head gasket - Change cylinder head gasket.
Incorrect injection timing - Adjust according to specifications.
| Oil pressure is insufficient |
Insufficient engine oil - Checking oil level and add if necessary.
Oil pump is worn or damaged - Repair or change.
Oil filter element clogged - Change or clean engine oil filter element.
Relief valve is defective or dirty - Relief valve need to be replaced or cleaned.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Test and repair or replace worn parts.
| Diesel engine consuming too much oil |
External oil leaks: Worn seals or gaskets - Replace defective parts.
Wrong oil viscosity - Fill up with the correct oil viscosity.
Worn or stuck piston rings - Piston rings replacement required.
Damaged valve guides or valve stems - Change the valves.
Pistons or cylinder liners are damaged - Check liners and pistons, install new components as required.
| Abnormal engine noise or knocking |
Engine is not preheated - Engine is not warmed up to the required temperature.
Engine oil level low - Add oil to the engine crankcase.
Fuel injection pump timing is not adjusted - Adjust as recommended.
Broken or worn pistons - Replace the pistons.
Connecting rod is defective or misaligned - Connecting rod needs to be aligned or changed.
Battery capacity is low - Recharge the battery.
Battery discharges quickly - Service charging system or install new battery.
Faulty battery terminals or disconnected cables - Connect cables properly or replace terminals.
Battery is low or faulty - Battery needs to be recharged or replaced.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery power is low - Recharge the battery.
Faulty starter motor - Starter should be changed.
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