John Deere 6068TF275 Troubleshooting
| Engine Model: John Deere PowerTech 6068TF275 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 135-165 Hp (101-123 kW) at 1800-2500 rpm |
| Fuel System Type: Direct Injection |
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| Engine starts hard or won't start |
Fuel filter element clogging - Clean the filter element.
There is air in the fuel system - Bleed the system.
Fuel injection nozzles are damaged or dirty - If necessary, replace with a new nozzle.
Fuel injection pump failure - Replace injection pump or repair it.
Valve timing is incorrect - Correct or change timing gear.
Plugged fuel pipes - Service or change fuel pipes.
Improper injection timing - Adjust injection timing as required.
Worn cylinder or piston rings - Change defective components.
| Engine starts and then shuts off |
Clogged fuel filter - Service or replace the filter.
Fuel injection pump is broken - Replacement or repair required.
Clogged air filter - Clean air cleaner element.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Engine stalls after running |
Improper setting of fuel injection pump timing - Set the fuel pump timing correctly.
Fuel filter plugging - Install new filter element.
Coolant temperature is low - Engine is not warmed up to the required temperature.
Stuck or clogged injection nozzle - Repair or replace injection nozzles.
Incorrect low idle setting - Normalize low idle speed.
Excessive valve clearance - Correct valve clearance.
Fuel injection pump is broken - Rebuild or change fuel pump.
Dirty or damaged injection nozzles - Check and replace nozzles if required.
Fuel hoses or lines clogging - Service fuel hoses and lines.
Dirty air cleaner - Clean or replace element.
Damaged cylinder-head gasket - Gasket should be replaced.
Incorrect injection timing - Adjust injection timing as required.
Fuel injection pump is broken - Change or repair the pump.
One of moving engine parts is faulty - Replace or repair damaged components.
Clogged radiator core or leaking radiator cap - Clean radiator or replace cap.
Lack of engine coolant - Refill to the correct level and inspect system for leaks.
Loose or defective fan belt - Belt change is required.
Lack of engine oil - Add oil to the engine crankcase.
Cylinder-head gasket is leaking - Install a new gasket.
Injection timing is incorrect - Check injection timing adjustment.
| Insufficient oil pressure |
Oil level is low - Fill up the engine oil.
Oil pump malfunction - Remove and inspect oil pump.
Plugged engine oil filter - Change or clean engine oil filter element.
Stuck or worn relief valve - Change or service relief valve.
Crankshaft bearing clearance is excessive - Test and replace or repair worn components.
Excessive oil clearance of crankpin bearing - Inspect and replace or repair faulty components.
| Excessive oil consumption |
External oil leaks: Seals or gaskets are defective - Install new components.
Incorrect oil viscosity - Use oil of proper viscosity.
Worn or broken piston rings - Change piston rings.
Valve stems and guides are worn - Change the valves.
Pistons or cylinder liners are worn - Check liners and pistons, install new components as required.
| Abnormal engine noise or knocking |
Engine is not warmed up to the required temperature - Warm up to required temperature.
Engine oil level is low - Add oil to the engine crankcase.
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Piston wear or scoring - Pistons need to be replaced.
Connecting rod misalignment or failure - Alignment procedure or replacement is required.
| Starter motor cranks slow |
Battery capacity is low - Recharge the battery.
Battery does not hold charge - Service charging system or change battery.
Bad terminals or disconnected battery cables - Connect wires properly or change terminals.
Battery is discharged or defective - Charge or change the battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery capacity is low - Recharge the battery.
Faulty starter motor - Change or repair starter.
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