John Deere 6068HF150 Troubleshooting
| Engine Model: John Deere PowerTech 6068HF150 |
| Engine Type: 4-stroke in-line 6-cylinder turbocharged liquid-cooled diesel |
| Total Displacement: 415 cu.in (6.8 L) |
| Rated Engine Power: 192-251 Hp (143-187 kW) at 1800-2200 rpm |
| Fuel System Type: Direct injection |
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| Engine starts hard or doesn't start |
Dirty fuel filter - Replace the filter element.
Air trapped in fuel system - Bleed air.
Clogged or burnt injection nozzle - If necessary, replace with a new nozzle.
Fuel injection pump is defective - Replacement or repair required.
Valve timing is improper - Adjust or change timing gear.
Dirty fuel pipes - Service fuel pipes.
Improper injection timing - Set the injection timing correctly.
Cylinder or piston rings are worn - Change faulty components.
| Engine starts but then stalls |
Fuel filter element clogging - Change filter element.
Faulty fuel injection pump - Change pump or rebuild it.
Plugged air filter - Air filter maintenance required.
Nozzle opening pressure is incorrect - Adjust as required.
| Engine shuts off while running |
Incorrect adjustment of fuel injection pump timing - Set up as recommended.
Clogged fuel filter - Filter maintenance required.
Engine not warmed up - Engine is not warmed up to the required temperature.
Stuck or burnt injection nozzle - Repair or change injection nozzles.
Low idle speed set incorrectly - Test and adjust.
Valve clearance is wrong - Correct valve clearance.
Faulty fuel injection pump - Install a new fuel pump or repair.
Fuel injection nozzles are faulty or clogged - Install a new kit of correctly balanced nozzles.
Dirt in the fuel hoses or lines - Clean fuel hoses and lines.
Dirty air filter element - Clean or replace element.
Cylinder head gasket is worn - Install a new gasket.
Injection timing is out of adjustment - Set the injection timing correctly.
Fuel injection pump is defective - Repair or replace injection pump.
One of moving engine parts is faulty - Repair or replace defective parts.
Radiator core is clogged or radiator cap is leaking - Change cap or clean radiator.
Not enough coolant - Add coolant fluid and inspect the cooling system for leaks.
Fan belt is worn or faulty - Install new fan belt.
Engine oil level is insufficient - Fill up the engine oil.
Cylinder head gasket is defective - Install new cylinder head gasket.
Injection timing is improper - Adjust according to specifications.
Oil level is insufficient - Fill up the engine oil.
Oil pump failure - Repair or change.
Oil filter element clogged - Change or service engine oil filter.
Worn or dirty relief valve - Relief valve need to be replaced or cleaned.
Clearance of crankshaft bearing is excessive - Inspect and replace or repair faulty components.
Crankpin bearing clearance is excessive - Check and replace or repair defective parts.
| Excessive oil consumption |
Oil leakage: Damaged gaskets or seals - New components need to be installed.
Crankcase oil too light - Use oil of proper viscosity.
Piston rings are seized or worn - Have piston rings replaced.
Valve guides and stems are worn - Change the valves.
Scored pistons or cylinder liners - Inspect pistons and liners, fit new components as necessary.
| Engine knocking sound or abnormal noise |
Engine has not warmed up to the recommended temperature - Engine is not warmed up to the required temperature.
Engine oil level is insufficient - Check oil level and add oil as required.
Wrong setting of fuel injection pump timing - Adjust as recommended.
Piston wear or scoring - Pistons replacement required.
Connecting rod is misaligned or defective - Need to align or replace the connecting rod.
Low battery output voltage - Battery is drained, charge it.
Battery is not holding charge - Service charging system or change battery.
Disconnected battery cables or bad terminals - Connect wiring properly or install new terminals.
Battery is drained or defective - Change or recharge battery.
Battery cables are disconnected or incorrectly connected - Check cables and connect as needed.
Battery capacity is low - Battery is drained, recharge it.
Damaged starter motor - Starter should be replaced.
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