John Deere 6414 Troubleshooting
| Engine Model: John Deere 6414 |
| Engine Type: 4-stroke in-line 6-cylinder naturally aspirated liquid-cooled diesel |
| Total Displacement: 414 cu.in (6.8 L) |
| Rated Engine Power: 90 Hp (67 kW) at 2200 rpm |
| Fuel System Type: Direct injection |
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| Engine hard to start or will not start |
Fuel filter plugging - Clean or change the filter.
Air trapped in fuel system - Bleed air.
Fuel injection nozzles are faulty or clogged - Replace injection nozzles.
Fuel injection pump malfunctioning - Replacement or repair required.
Valve timing is wrong - Adjust or replace timing gear.
Clogged fuel pipes - Service or change fuel pipes.
Improper injection timing - Set up as recommended.
Worn cylinder or piston rings - Replace faulty parts.
| Engine starts but stops suddenly |
Fuel filter plugging - Service the filter.
Fuel injection pump malfunctioning - Rebuild or replace pump.
Air filter plugged - Install new air filter element.
Nozzle opening pressure is improper - Set up as recommended.
| Engine shuts off suddenly during operation |
Fuel injection timing is not adjusted - Set up as recommended.
Dirty fuel filter - Clean or replace the filter.
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Injection nozzles are stuck or clogged - Change or repair injection nozzles.
| Engine stops at low idle speed |
Incorrectly set low idle speed - Correct low idle settings.
The valve clearance is incorrect - Check and adjust as required.
Fuel injection pump is not working correctly - Replacement or repair required.
| Diesel engine loses power |
Fuel injection nozzles are faulty or clogged - Install a new kit of correctly balanced nozzles.
Fuel lines or hoses are dirty - Fuel hoses and lines must be clean.
Plugged air filter - Carry out maintenance on air filter.
Leaking cylinder head gasket - Replace cylinder head gasket.
Improper injection timing - Adjust according to specifications.
Fuel injection pump failure - Change or repair the pump.
Any of moving engine parts is worn - Change or repair damaged parts.
Radiator fins are dirty or radiator cap is defective - Clean radiator or install new cap.
Engine coolant is insufficient - Add coolant fluid and inspect the cooling system for leaks.
Loose or damaged fan belt - Belt replacement is recommended.
Engine oil insufficient - Add oil to the engine crankcase.
Cylinder head gasket is damaged - Replace cylinder head gasket.
Unadjusted injection timing - Adjust injection timing as required.
Engine oil insufficient - Fill the crankcase with oil.
Oil pump is damaged - Repair or change.
Oil filter clogging - Service or change engine oil filter element.
Relief valve is defective or dirty - Change or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and change or repair worn components.
Clearance of crankpin bearing is excessive - Check and replace or repair defective parts.
Oil leaks: Worn seals or gaskets - Replace defective parts.
Crankcase oil too light - Use oil of correct viscosity.
Damaged or seized piston rings - Replace piston rings.
Valve stems and guides are worn - Replace defective valves.
Pistons or cylinder liners are damaged - Inspect pistons and liners, replace as required.
Engine has not warmed up to the recommended temperature - Warm up to required temperature.
Insufficient engine oil - Add oil to the engine crankcase.
Incorrect adjustment of fuel injection pump timing - Set the fuel pump timing correctly.
Pistons are worn or broken - Install new pistons.
Connecting rod is worn or misaligned - Replace or align connecting rod.
Low battery voltage - Charge the battery.
Battery is not holding charge - Service or change the battery.
Disconnected wires or corroded battery terminals - Check wire connections and change or service terminals.
Battery is low or faulty - Charge or change the battery.
Wiring harness is disconnected or improperly connected - Check wiring harness and connect as required.
Low battery output - Battery is drained, charge it.
Starter motor is faulty - Repair or change starter.
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