John Deere 6068TF250 Troubleshooting
| Engine Model: John Deere PowerTech 6068TF250 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 173 Hp (129 kW) at 2500 rpm |
| Fuel System Type: Direct Injection |
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| Engine difficult to start or won't start |
Fuel filter element is clogged - Install new filter element.
Air in the fuel system - Air bleeding.
Clogged or defective injection nozzles - Change fuel injection nozzles.
Defective fuel injection pump - Replacement or repair required.
Valve timing is out of adjustment - Correct or replace timing gear.
Fuel pipes are clogged - Clean or change fuel pipes.
Incorrect injection timing - Set up as recommended.
Worn piston rings and cylinder - Replace defective components.
| Engine starts and stops suddenly |
Fuel filter element clogging - Service the filter.
Damaged fuel injection pump - Change or repair the pump.
Clogged air cleaner - Air filter maintenance required.
Incorrect nozzle opening pressure - Adjust as required.
| Engine shuts off suddenly while running |
Timing of fuel injection pump is incorrect - Adjust as recommended.
Fuel filter plugged - Service the filter.
Engine has not warmed up to the recommended temperature - Normalize the temperature by warming up the engine.
Stuck or clogged injection nozzle - Change or repair injection nozzles.
Improperly adjusted low idle speed - Adjust as required.
Valve clearance is not correct - Check and adjust.
Fuel injection pump is not operating properly - Rebuild or replace pump.
Defective or clogged injection nozzle - Change fuel injection nozzles.
Fuel hoses or lines clogging - Service fuel lines and hoses.
Dirty air cleaner - Clean air cleaner element.
Worn cylinder head gasket - Cylinder-head gasket replacement required.
Improper injection timing - Adjust as recommended.
Faulty fuel injection pump - Install a new pump or rebuild.
One of moving engine parts has broken - Replace or repair damaged components.
Clogged radiator fins or leaking radiator cap - Install new cap or clean radiator.
Lack of engine coolant - Add coolant fluid and inspect the cooling system for leaks.
Broken or loose fan belt - Install new fan belt.
Low engine oil level - Checking oil level and add if necessary.
Cylinder head gasket is worn - Cylinder-head gasket replacement required.
Injection timing is wrong - Adjust injection timing as required.
Low crankcase oil level - Add oil to the engine crankcase.
Oil pump malfunction - Check and replace if necessary.
Plugged engine oil filter - Replace or clean engine oil filter element.
Relief valve is defective or dirty - Replace or service relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Crankpin bearing clearance is excessive - Check and replace or repair defective parts.
| Diesel engine using too much oil |
Oil leaking: Gaskets or seals are excessively worn - Replace to repair leaks.
Oil viscosity is wrong - Fill up with the correct oil viscosity.
Stuck or defective piston rings - Change piston rings.
Valve stems or guides are damaged - Valves need to be changed.
Cylinder liners or pistons are scored - Check liners and pistons, change as required.
Engine is not preheated - Engine is not warmed up to the required temperature.
Engine oil level is insufficient - Checking oil level and add if necessary.
Improper fuel injection timing - Adjust as recommended.
Broken or worn pistons - Pistons replacement required.
Misaligned or faulty connecting rod - Align or replace connecting rod.
| Starter motor cranks slow |
Battery capacity is low - Charge the battery.
Battery drains quickly - Service battery or replace it.
Bad battery terminals or disconnected wiring - Connect wiring properly or install new terminals.
Battery is drained or defective - Charge or change the battery.
Wiring is improperly connected or disconnected - Check wiring and connect properly.
Battery capacity is low - Battery is drained, recharge it.
Starter motor is defective - Starter needs to be changed.
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