John Deere 6068T Troubleshooting
| Engine Model: John Deere 6068T |
| Engine Type: 4-cycle inline 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 148-208 Hp (111-155 kW) at 2400 rpm |
| Fuel System Type: Direct fuel injection |
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| Engine hard to start or won't start |
Fuel filter element clogging - Replace the filter element.
There is air in the fuel system - Bleed the system.
Clogged or burnt injection nozzle - Install a new kit of correctly balanced nozzles.
Defective fuel injection pump - Rebuild or install a new injection pump.
Incorrect valve timing - Use correct valve timing adjustment.
Plugged fuel pipes - Clean fuel pipes.
Unadjusted injection timing - Adjust as recommended.
Worn piston rings and cylinder - Change faulty components.
| Diesel starts but stalls suddenly |
Dirty fuel filter - Install new filter element.
Defective fuel injection pump - Change pump or rebuild it.
Plugged air cleaner - Clean or change.
Nozzle opening pressure is improper - Adjust as required.
| Engine shuts off suddenly while running |
Wrong setting of fuel injection pump timing - Adjust the pump as required.
Fuel filter element clogging - Service or replace the filter.
Engine is not warmed up to the required temperature - Warm up to required temperature.
Injection nozzles sticking or clogged - Change or repair injection nozzles.
Low idle speed setting is incorrect - Adjust the low idle speed.
Excessive valve clearance - Adjust valve clearance according to specifications.
Fuel injection pump malfunctioning - Repair or change injection pump.
Dirty or damaged injection nozzles - Replace injection nozzles.
Fuel hoses or lines are clogged - Service fuel lines and hoses.
Clogged air cleaner - Change air filter element.
Worn cylinder head gasket - Change cylinder head gasket.
Improper injection timing - Check injection timing adjustment.
Fuel injection pump failure - Change pump or rebuild it.
Any of moving engine parts is worn - Repair or replace defective parts.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or replace cap.
Engine coolant is insufficient - Refill to the correct level and inspect system for leaks.
Fan belt is loose or defective - Replace as required.
Engine oil level is insufficient - Add oil to the engine crankcase.
Cylinder head gasket defective - Change cylinder head gasket.
Incorrect injection timing - Check injection timing adjustment.
Oil level is insufficient - Fill up the engine oil.
Oil pump failure - Inspect and change as required.
Oil filter clogging - Service or replace engine oil filter.
Worn or dirty relief valve - Change or clean relief valve.
Excessive crankshaft bearing clearance - Test and repair or replace worn parts.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty parts.
| Diesel engine consuming too much oil |
Oil leakage: Defective seals or gaskets - Worn parts need to be replaced.
Improper oil viscosity - Fill up with the proper oil viscosity.
Piston rings are seized or worn - Change piston rings.
Damaged valve stems or valve guides - Valves must be replaced.
Damaged cylinder liners or pistons - Inspect liners and pistons, fit new parts as necessary.
Engine not warmed up - Warm up the engine.
Engine oil level low - Add oil to the engine crankcase.
Fuel injection pump timing is not adjusted - Check the fuel injection pump timing adjustment.
Pistons are scored or worn - Replace the pistons.
Connecting rod is not aligned or defective - Align or replace connecting rod.
| Starter motor cranks slow |
Low battery output voltage - Battery needs to be recharged.
Battery discharges quickly - Service or change the battery.
Disconnected wiring or bad battery terminals - Check cables and clean or change terminals.
Battery is drained or worn - Replace or charge as required.
Battery wires are disconnected or incorrectly connected - Check wires and connect correctly.
Low battery voltage - Low battery charging, charge as required.
Starter motor failing - Repair or change starter.
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