John Deere 6068TF150 Troubleshooting
| Engine Model: John Deere PowerTech 6068TF150 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 170 Hp (127 kW) at 2500 rpm |
| Fuel System Type: Direct Injection |
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| Engine hard to start or won't start |
Fuel filter element clogging - Service the filter.
Air in the fuel system - Air bleeding.
Clogged or burnt injection nozzle - If necessary, replace with a new nozzle.
Faulty fuel injection pump - Change pump or rebuild it.
Unadjusted valve timing - Adjust or replace timing gear.
Restricted fuel pipes - Clean fuel pipes.
Injection timing is out of adjustment - Use correct injection timing adjustment.
Piston rings and cylinder are worn - Change faulty parts.
| Engine stalls after starting |
Fuel filter plugged - Change the filter element.
Faulty fuel injection pump - Replace injection pump or repair it.
Dirty air filter - Replace air filter element.
Nozzle opening pressure is improper - Adjust as recommended.
| Engine shuts off suddenly during operation |
Fuel injection timing is not adjusted - Adjust fuel injection pump as required.
Clogged fuel filter - Clean or change the filter.
Low coolant temperature - Normalize the temperature by warming up the engine.
Injection nozzles are burnt or jammed - Repair or replace injection nozzles.
| Engine stops at low idle speed |
Too low idle RPM - Adjustment required.
Valve clearance is wrong - Check and adjust as required.
Faulty fuel injection pump - Change pump or rebuild it.
Fuel injection nozzles are clogged or faulty - If necessary, replace with a new nozzle.
Fuel hoses or lines are clogged - Clean fuel system hoses and lines.
Clogged air cleaner - Install new air filter element.
Worn cylinder head gasket - Replace cylinder head gasket.
Improper injection timing - Use correct injection timing adjustment.
Fuel injection pump is faulty - Change pump or rebuild it.
One of moving engine parts has broken - Repair or replace defective parts.
Radiator core is dirty or radiator cap is damaged - Clean radiator or replace cap.
Lack of coolant in cooling system - Top up coolant fluid and check system for leaks.
Fan belt is broken or worn - Replace the fan belt.
Engine oil level is insufficient - Need to add engine oil.
Cylinder head gasket is damaged - Install new cylinder head gasket.
Improper injection timing - Adjust as recommended.
| Insufficient oil pressure |
Engine oil level low - Fill the crankcase with oil.
Defective oil pump - Replace as required.
Oil filter is clogged - Clean or replace engine oil filter element.
Relief valve is defective or dirty - Replace or clean relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Excessive oil clearance of crankpin bearing - Check and replace or repair defective parts.
| Engine oil consumption is too high |
External oil leaks: Gaskets or seals are excessively worn - Replace to repair leaks.
Oil viscosity is wrong - Use correct viscosity oil.
Worn or broken piston rings - Change the piston rings as required.
Damaged valve stems or valve guides - Valves must be replaced.
Scored pistons or cylinder liners - Inspect liners and pistons, fit new parts as necessary.
Engine is cold - Normalize the temperature by warming up the engine.
Not enough engine oil - Check oil level and add oil as required.
Timing of fuel injection pump is incorrect - Adjust as recommended.
Scored or worn pistons - Have pistons replaced.
Connecting rod is defective or misaligned - Need to replace or align the connecting rod.
Battery capacity is low - Battery needs to be recharged.
Battery is draining quickly - Service or replace the battery.
Bad terminals or disconnected battery cables - Connect cables correctly or replace terminals.
Battery is drained or worn - Replace or charge as required.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Low battery voltage - Recharge the battery.
Damaged starter motor - Repair or install a new starter.
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