John Deere 6404 Troubleshooting
| Engine Model: John Deere 6404 |
| Engine Type: 4-stroke in-line 6-cylinder liquid-cooled diesel |
| Total Displacement: 404 cu.in (6.6 L) |
| Rated Engine Power: 95-130 Hp (70.5-96 kW) at 2200-2500 rpm |
| Fuel System Type: Direct Injection |
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| Engine starts hard or doesn't start |
Fuel filter element clogging - Change filter element.
Air in the fuel system - Air bleeding.
Damaged or dirty injection nozzles - If necessary, replace with a new nozzle.
Fuel injection pump damage - Change pump or rebuild it.
Incorrect valve timing - Set the valve timing correctly.
Fuel pipes are plugged - Clean or change fuel pipes.
Incorrect injection timing - Adjust as recommended.
Piston rings and cylinder are worn - Replace defective parts.
| Engine starts and then shuts off |
Fuel filter plugged - Service or replace the filter.
Fuel injection pump is defective - Rebuild or replace pump.
Restricted intake air - Change air filter element.
Improper nozzle opening pressure - Set it correctly.
| Engine stops running suddenly |
Fuel injection timing is not adjusted - Adjust the pump as required.
Fuel filter plugging - Filter maintenance required.
Low coolant temperature - Warm up the engine.
Stuck or burnt injection nozzle - Service or change injection nozzles.
Incorrectly adjusted low idle speed - Normalize low idle speed.
Improper valve clearance - Have it adjusted.
Fuel injection pump is broken - Rebuild or install a new injection pump.
Fuel injection nozzles fault - If necessary, replace with a new nozzle.
Clogged fuel lines or hoses - Clean fuel lines and hoses.
Clogged air filter element - Clean air cleaner element.
Cylinder head gasket is blown - Install new cylinder head gasket.
Wrong injection timing - Adjust injection timing as required.
Fuel injection pump is defective - Rebuild or install a new injection pump.
Any of moving engine components is faulty - Replace or repair damaged components.
Dirty radiator core or faulty radiator cap - Clean radiator or replace cap.
Coolant level is low - Fill radiator to proper level and check components for faults.
Excessive wear of the fan belt - Install new fan belt.
Lack of engine oil - Checking oil level and add if necessary.
Cylinder head gasket is damaged - Gasket should be replaced.
Injection timing is wrong - Set up as recommended.
Low oil level - Add oil to the engine crankcase.
Oil pump is defective - Repair or change.
Dirty oil filter - Clean or replace engine oil filter element.
Worn or dirty relief valve - Replace or service relief valve.
Clearance of crankshaft bearing is excessive - Inspect and change or repair worn components.
Excessive crankpin bearing clearance - Check and change or repair defective parts.
| Engine using too much oil |
Oil leaking: Defective seals or gaskets - Replace worn parts to avoid leaks.
Improper oil viscosity - Fill up with the correct oil viscosity.
Piston rings are stuck or broken - Piston rings need to be replaced.
Worn valve guides and valve stems - Install new valves.
Scored cylinder liners or pistons - Inspect pistons and liners, fit new components as necessary.
Low coolant temperature - Warm up the engine.
Insufficient engine oil - Need to add engine oil.
Improper fuel injection timing - Adjust fuel injection pump as required.
Broken or worn pistons - Have pistons replaced.
Connecting rod is misaligned or worn - Need to change or align the connecting rod.
Battery capacity is low - Charge the battery.
Battery won’t hold charge - Service or change the battery.
Faulty battery terminals or disconnected cables - Check cables and clean or change terminals.
Battery is discharged or defective - Charge or replace the battery.
Battery cables are disconnected or improperly connected - Inspect cables and connect properly.
Battery capacity is low - Charge the battery.
Starter motor is defective - Change or repair starter.
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