John Deere 6068HFC48 Troubleshooting
| Engine Model: John Deere PowerTech Plus 6068HFC48 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 180-282 Hp (134-210 kW) at 2400 rpm |
| Fuel System Type: Common Rail Direct Injection |
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| Diesel hard to start or doesn't start |
Fuel filter element is clogged - Service or replace the filter.
Air in the fuel system - Air bleeding.
Damaged or dirty injection nozzles - Test injection nozzles and change if necessary.
Fuel injection pump damage - Replace or rebuild injection pump.
Valve timing is wrong - Use correct valve timing adjustment.
Clogged fuel pipes - Service fuel pipes.
Wrong injection timing - Adjust injection timing as required.
Cylinder or piston rings are worn - Replace faulty components.
| Diesel starts but immediately stops |
Fuel filter plugging - Install new filter element.
Fuel injection pump damage - Install a new pump or rebuild.
Air filter plugged - Carry out maintenance on air filter.
Nozzle opening pressure is not adjusted - Set up as recommended.
| Engine stops running suddenly |
Improper setting of fuel injection pump timing - Adjust according to specifications.
Fuel filter element is dirty - Replace filter element.
Engine not warmed up - Warm up the engine.
Injection nozzles are burnt or jammed - Change or repair injection nozzles.
| Engine stalls at low idle speed |
Incorrect low idle setting - Correct low idle adjustment.
The valve clearance is not adjusted - Need to adjust valve clearance.
Fuel injection pump is damaged - Replace injection pump or repair it.
Fuel injection nozzles are dirty or defective - Replace injection nozzles.
Dirt in the fuel hoses or lines - Clean fuel hoses and lines.
Plugged air filter - Clean or change.
Cylinder head gasket is worn - Replace the gasket as required.
Unadjusted injection timing - Use correct injection timing adjustment.
Fuel injection pump is faulty - Repair or change injection pump.
Any of moving engine parts is worn - Replace or repair damaged components.
Damaged radiator cap or dirty radiator core - Clean radiator or change cap.
Lack of engine coolant - Add coolant and check the components of cooling system.
Loose or damaged fan belt - Belt change is required.
Insufficient engine oil - Fill the crankcase with engine oil.
Worn cylinder head gasket - Replace cylinder head gasket.
Incorrect injection timing - Use correct injection timing adjustment.
| Oil pressure is insufficient |
Engine oil level low - Checking oil level and add if necessary.
Oil pump is damaged - Repair or replace.
Plugged engine oil filter - Change or service engine oil filter.
Stuck or defective relief valve - Replace or service relief valve.
Crankshaft bearing clearance is excessive - Check and change or repair defective parts.
Excessive crankpin bearing clearance - Check and replace or repair defective parts.
| Excessive oil consumption |
Oil leaking: Gaskets or seals can be faulty - To repair leaks, replace worn parts.
Oil viscosity is wrong - Use proper viscosity oil.
Piston rings are seized or worn - Install new piston rings.
Valve stems or guides are damaged - Valves need to be changed.
Scuffed cylinder liners or pistons - Inspect liners and pistons, change as necessary.
| Abnormal engine knocking or noise |
Engine is cold - Warm up to required temperature.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.
Pistons are worn or broken - Pistons replacement required.
Connecting rod is misaligned or defective - Connecting rod needs to be aligned or changed.
Low battery power - Battery is drained, recharge it.
Battery is not holding charge - Service or change the battery.
Battery cables are disconnected or terminals are faulty - Connect wiring correctly or install new terminals.
Battery is low or faulty - Need to charge or replace the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery voltage is low - Battery needs to be recharged.
Defective starter motor - Starter needs to be replaced.
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