John Deere 6068TFM50 Troubleshooting
| Engine Model: John Deere PowerTech 6068TFM50 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 154-225 Hp (115-168 kW) at 2300-2600 rpm |
| Fuel System Type: Direct Injection |
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| Engine difficult to start or will not start |
Clogged fuel filter - Service the filter.
Air in the fuel system - Air bleeding.
Fuel injection nozzles are faulty or clogged - Change fuel injection nozzles.
Fuel injection pump is not operating properly - Change or repair the pump.
Incorrect valve timing - Set the valve timing correctly.
Dirty fuel pipes - Clean or replace fuel pipes.
Incorrect injection timing - Use correct injection timing adjustment.
Worn cylinder or piston rings - Replace faulty parts.
| Engine starts but stalls immediately |
Fuel filter element is dirty - Service the filter.
Fuel injection pump is not operating properly - Replace injection pump or repair it.
Air filter element clogged - Replace air filter element.
Unadjusted nozzle opening pressure - Set up as recommended.
| Engine shuts off suddenly while running |
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Fuel filter element clogging - Clean the filter or install new filter element.
Engine is not fully warmed up - Normalize the temperature by warming up the engine.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
| Engine stalls when idling |
Low idle speed set incorrectly - Adjustment required.
Valve clearance is wrong - Have it adjusted.
Fuel injection pump is not working correctly - Repair or replace injection pump.
Clogged or defective injection nozzles - Replace injection nozzles.
Fuel lines or hoses clogging - Clean fuel system hoses and lines.
Clogged air filter element - Service or replace the air filter.
Blown cylinder head gasket - Gasket should be replaced.
Improper injection timing - Adjust according to specifications.
Fuel injection pump malfunctioning - Change pump or rebuild it.
One of moving engine parts has broken - Change or repair damaged parts.
Clogged radiator core or leaking radiator cap - Clean radiator or replace cap.
Lack of coolant in cooling system - Fill radiator to proper level and check components for faults.
Fan belt slipping or worn - Fan belt must be replaced.
Engine oil level is insufficient - Fill the crankcase with engine oil.
Damaged cylinder-head gasket - Replace cylinder head gasket.
Injection timing is out of adjustment - Check injection timing adjustment.
Oil level is low - Need to add oil.
Worn oil pump - Check and replace if necessary.
Dirty oil filter - Clean or change engine oil filter.
Stuck or worn relief valve - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Inspect and replace or repair faulty components.
Excessive crankpin bearing clearance - Inspect and replace or repair faulty components.
Oil leaking: Damaged seals or gaskets - Install new components.
Oil viscosity is incorrect - Use correct viscosity oil.
Piston rings are stuck or worn - Change piston rings.
Damaged valve guides or valve stems - Replace defective valves.
Scored pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
| Abnormal engine knocking or noise |
Engine not warmed up - Warm up engine as required.
Engine oil level low - Add oil to the engine crankcase.
Incorrect adjustment of fuel injection pump timing - Adjust the pump as required.
Pistons are broken or worn - Pistons replacement required.
Connecting rod failure or misalignment - Alignment procedure or replacement is required.
Low battery voltage - Charge the battery.
Battery discharges quickly - Battery needs to be serviced or replaced.
Corroded battery terminals or disconnected wires - Connect cables correctly or replace terminals.
Battery is drained or defective - Change or recharge battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery power - Battery is drained, charge it.
Starter motor failure - Repair or replace starter.
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