John Deere 6081AFM75 Troubleshooting
| Engine Model: John Deere 6081AFM75 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 496 cu.in (8.1 L) |
| Rated Engine Power: 235-375 Hp (175-280 kW) at 2100-2400 rpm |
| Fuel System Type: Electronic unit injector |
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| Engine starts up hard or doesn't start |
Fuel filter element is dirty - Filter maintenance required.
There is air in the fuel system - Bleed the system.
Faulty or dirty injection nozzles - Inspect nozzles and replace if necessary.
Fuel injection pump is faulty - Replace injection pump or repair it.
Valve timing is wrong - Adjust or change timing gear.
Fuel pipes are plugged - Clean or replace fuel pipes.
Wrong injection timing - Adjust according to specifications.
Piston rings and cylinder are worn - Change faulty components.
| Diesel starts and stalls immediately |
Fuel filter plugging - Clean the filter or install new filter element.
Damaged fuel injection pump - Install a new fuel pump or repair.
Air filter is dirty - Replace air filter element.
Nozzle opening pressure is improper - Set up as recommended.
| Engine stops suddenly during operation |
Fuel injection timing is wrong - Set the fuel pump timing correctly.
Fuel filter element is clogged - Change the filter element.
Engine has not warmed up to the recommended temperature - Warm up the engine.
Injection nozzles are stuck or clogged - Repair or change injection nozzles.
| Engine stalls at low idle speed |
Low idle speed set incorrectly - Test and adjust.
Valve out of adjustment - Adjust valve clearance.
Fuel injection pump is faulty - Replace or repair injection pump.
Clogged injection nozzle - Service or change injection nozzles.
Clogged fuel hoses or lines - Clean fuel lines and hoses.
Clogged air cleaner - Replace air filter element.
Leaking cylinder head gasket - Change cylinder head gasket.
Wrong injection timing - Adjust injection timing as required.
Fuel injection pump is defective - Repair or install new pump.
One of moving engine components has failed - Replace or repair damaged components.
Dirty radiator fins or defective radiator cap - Clean radiator or change cap.
Insufficient coolant fluid - Fill radiator to proper level and check components for faults.
Loose or damaged fan belt - Replace the fan belt.
Low engine oil level - Checking oil level and add if necessary.
Leaking cylinder head gasket - Install new cylinder head gasket.
Injection timing is incorrect - Set the injection timing correctly.
| Oil pressure is insufficient |
Not enough oil in the engine - Add oil as required.
Oil pump malfunction - Repair or change.
Plugged engine oil filter - Replace or service engine oil filter.
Relief valve is stuck or broken - Change or service relief valve.
Crankshaft bearing clearance is excessive - Check and replace or repair defective parts.
Excessive crankpin bearing clearance - Check and replace or repair defective parts.
| Excessive engine oil consumption |
Oil leaking: Worn seals or gaskets - Install new components.
Wrong oil viscosity - Use oil of correct viscosity.
Piston rings are stuck or broken - Piston rings replacement required.
Worn valve guides and valve stems - Replace the valves.
Scuffed cylinder liners or pistons - Inspect pistons and liners, replace as required.
Engine is not warmed up to the required temperature - Warm up the engine.
Lack of engine oil - Check oil level and add oil as required.
Timing of fuel injection pump is incorrect - Adjust fuel injection pump as required.
Pistons are scored or worn - Install new pistons.
Misaligned or defective connecting rod - Alignment procedure or replacement is required.
Low battery capacity - Battery needs to be recharged.
Battery discharges quickly - Battery needs to be serviced or replaced.
Bad battery terminals or disconnected wiring - Connect cables correctly or replace terminals.
Battery is drained or defective - Recharge or replace battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output - Battery is drained, recharge it.
Starter motor failing - Starter needs to be changed.
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