John Deere 6068SFM85 Troubleshooting
| Engine Model: John Deere PowerTech 6068SFM85 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 249-400 Hp (186-298 kW) at 2400-2800 rpm |
| Fuel System Type: Common Rail Direct Injection |
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| Engine hard to start or will not start |
Fuel filter plugged - Replace the filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are clogged or faulty - Clean or change injection nozzles.
Damaged fuel injection pump - Repair or install new pump.
Improper valve timing - Use correct valve timing adjustment.
Dirty fuel pipes - Service or change fuel pipes.
Improper injection timing - Adjust according to specifications.
Damaged piston rings and cylinder - Change defective parts.
| Diesel starts and then shuts off |
Dirty fuel filter - Clean the filter or install new filter element.
Fuel injection pump is not operating properly - Repair or install a new fuel pump.
Restricted intake air - Service or replace the air filter.
Improper nozzle opening pressure - Adjust as required.
| Engine stops suddenly during operation |
Fuel injection timing is not adjusted - Use the correct fuel injection pump timing adjustment.
Fuel filter element is clogged - Install new filter element.
Engine not warmed up - Warm up to required temperature.
Defective or stuck injection nozzles - Repair or change injection nozzles.
| Engine stops while idling |
Incorrectly adjusted low idle speed - Correct low idle adjustment.
Excessive valve clearance - Correct valve clearance needs to be set.
Fuel injection pump is broken - Repair or install new pump.
Fuel injection nozzles are clogged or faulty - If necessary, replace with a new nozzle.
Fuel hoses or lines are dirty - Service fuel hoses and lines.
Air filter plugged - Carry out maintenance on air filter.
Leaking cylinder head gasket - Cylinder-head gasket replacement required.
Injection timing is improper - Use correct injection timing adjustment.
Fuel injection pump failure - Rebuild or replace pump.
One of moving engine components has failed - Repair or replace defective components.
Radiator core is dirty or radiator cap is damaged - Install new cap or clean radiator.
Engine coolant is insufficient - Top up coolant fluid and check system for leaks.
Fan belt is loose or defective - Belt change is required.
Not enough engine oil - Add oil to the engine crankcase.
Cylinder head gasket is blown - Change cylinder head gasket.
Injection timing is out of adjustment - Adjust according to specifications.
Oil level is low - Check and refill the oil.
Oil pump is worn or damaged - Check and replace if necessary.
Oil filter element clogged - Replace or clean engine oil filter element.
Relief valve is stuck or broken - Change or service relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Inspect and replace or repair faulty parts.
Oil leaks: Seals or gaskets are wearing excessively - Change worn parts according to specifications.
Crankcase oil too light - Use oil of proper viscosity.
Seized or wear piston rings - Install new piston rings.
Worn valve stems and valve guides - Need to replace the valves.
Cylinder liners or pistons are damaged - Check pistons and liners, replace as required.
Engine is cold - Normalize the temperature by warming up the engine.
Insufficient engine oil - Need to add engine oil.
Wrong setting of fuel injection pump timing - Use the correct fuel injection pump timing adjustment.
Pistons are broken or worn - Replace the pistons.
Connecting rod is worn or not aligned - Connecting rod needs to be replaced or aligned.
| Starter motor cranks slow |
Battery voltage is low - Recharge the battery.
Battery drains quickly - Battery needs service or replacement.
Battery terminals are corroded or wires are disconnected - Check wire connections and change or service terminals.
Battery is drained or worn - Charge or change the battery.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery output - Battery is drained, charge it.
Faulty starter motor - Change or repair starter.
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