John Deere 6068HF485 Troubleshooting
| Engine Model: John Deere PowerTech 6068HF485 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 173-250 Hp (129-187 kW) at 2400 rpm |
| Fuel System Type: Common Rail Direct Injection |
____________________________________________________________________________________
| Engine difficult to start or doesn't start |
Dirty fuel filter - Service the filter.
Air in fuel system - Bleed fuel system.
Damaged or dirty injection nozzles - Clean or change injection nozzles.
Damaged fuel injection pump - Replacement or repair required.
Valve timing is out of adjustment - Use correct valve timing adjustment.
Plugged fuel pipes - Clean fuel pipes.
Incorrect injection timing - Adjust injection timing as required.
Worn piston rings and cylinder - Replace faulty parts.
| Engine starts but stalls suddenly |
Fuel filter element is clogged - Filter maintenance required.
Fuel injection pump malfunctioning - Install a new fuel pump or repair.
Air filter clogged - Change air filter element.
Nozzle opening pressure is improper - Adjust as required.
| Engine shuts off suddenly during operation |
Fuel injection timing is not adjusted - Check the fuel injection pump timing adjustment.
Fuel filter element clogging - Install new filter element.
Low coolant temperature - Normalize the temperature by warming up the engine.
Injection nozzles are stuck or clogged - Clean or change injection nozzles.
| Engine shuts off while idling |
Incorrect low idle speed adjustment - Adjust low idle speed.
Incorrect valve clearance - Adjustment procedure required.
Damaged fuel injection pump - Change or repair the pump.
Fuel injection nozzles are damaged - Service or change injection nozzles.
Dirty fuel lines or hoses - Clean fuel hoses and lines.
Dirty air cleaner - Clean air cleaner element.
Blown cylinder head gasket - Replace cylinder head gasket.
Injection timing is incorrect - Adjust injection timing as required.
Fuel injection pump is faulty - Change pump or rebuild it.
One of moving engine components has failed - Repair or replace defective parts.
Radiator fins are clogged or radiator cap is faulty - Clean radiator or install new cap.
Coolant level is low - Top up coolant fluid and check system for leaks.
Loose or defective fan belt - Change the fan belt.
Insufficient engine oil - Need to add engine oil.
Blown cylinder head gasket - Replace the gasket as required.
Injection timing is improper - Check injection timing adjustment.
| Oil pressure is insufficient |
Insufficient engine oil - Checking oil level and add if necessary.
Defective oil pump - Repair or change.
Oil filter element clogged - Service or replace 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 parts.
Crankpin bearing clearance is excessive - Test and repair or replace worn parts.
| Excessive engine oil consumption |
Oil leakage: Seals or gaskets are defective - Replace defective parts.
Oil viscosity is wrong - Fill up with the proper oil viscosity.
Piston rings are stuck or broken - Change the piston rings as required.
Worn valve guides and valve stems - Valves replacement required.
Scuffed pistons or cylinder liners - Check pistons and liners, change as required.
Engine is not warmed up to the required temperature - Warm up the engine.
Not enough engine oil - Check oil level and add oil as required.
Fuel injection pump timing is wrong - Adjust fuel injection pump as required.
Broken or worn pistons - Install new pistons.
Connecting rod is worn or misaligned - Need to change or align the connecting rod.
Battery power is low - Recharge the battery.
Battery drains quickly - Service battery or change it.
Wires are disconnected or battery terminals are corroded - Connect wiring properly or install new terminals.
Battery is drained or worn - Change or recharge battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Low battery capacity - Battery needs to be recharged.
Faulty starter motor - Repair or change starter.
____________________________________________________________________________________
| Industrial Engines Technical Specifications |
| Car Engines Technical Specifications |
| Small Engines Technical Specifications |
| Outboard Engines Technical Specifications |
