Deutz F6L914 Troubleshooting
| Engine Model: Deutz F6L914 |
| Engine Type: 4-cycle inline 6-cylinder direct injection air-cooled diesel |
| Total Displacement: 404 cu.in (6.5 L) |
| Rated Engine Power: 94-148 Hp (70-110 kW) at 2500 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine difficult to start or won't start |
Fuel filter element clogging - Clean the filter element.
Air in the fuel pipes - Bleed the fuel pipes.
Fuel injection nozzles are faulty or clogged - If necessary, replace with a new nozzle.
Fuel injection pump is not operating properly - Repair or replace injection pump.
Valve timing is improper - Use correct valve timing adjustment.
Fuel pipes are plugged - Clean fuel pipes.
Improper injection timing - Adjust as recommended.
Worn piston rings and cylinder - Change faulty components.
| Diesel starts but then stops |
Dirty fuel filter - Replace the filter element.
Faulty fuel injection pump - Replace or repair injection pump.
Air filter plugged - Install new air filter element.
Unadjusted nozzle opening pressure - Adjust according to specifications.
| Diesel shuts off while driving |
Improper fuel injection timing - Set it up as required.
Dirty fuel filter - Clean or replace the filter.
Engine is not fully warmed up - Warm up engine as required.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
Wrong adjustment of low idle speed - Need to adjust idle speed.
Incorrect valve clearance - Adjust valve clearance.
Fuel injection pump is faulty - Rebuild or replace pump.
Faulty fuel injection nozzles - Check and replace nozzles if required.
Dirty fuel lines or hoses - Service fuel hoses and lines.
Restricted intake air - Replace air filter element.
Blown cylinder head gasket - Install a new gasket.
Unadjusted injection timing - Adjust according to specifications.
Fuel injection pump is defective - Install a new pump or rebuild.
One of moving engine components has failed - Repair or replace defective components.
Cooling fins are clogged - Need to clean or wash.
Damaged or worn fan belt - Fan belt must be replaced.
Insufficient engine oil - Fill the crankcase with engine oil.
Cylinder head gasket is worn - Install a new gasket.
Incorrect injection timing - Adjust according to specifications.
| Insufficient oil pressure |
Low crankcase oil level - Fill up the engine oil.
Worn oil pump - Repair or change.
Plugged engine oil filter - Clean or replace engine oil filter element.
Relief valve is defective or dirty - Replace or clean relief valve.
Excessive oil clearance of crankshaft bearing - Test and repair or replace worn parts.
Excessive crankpin bearing clearance - Test and repair or replace worn parts.
| Excessive engine oil consumption |
External oil leaks: Seals or gaskets are defective - Change worn parts according to specifications.
Wrong oil viscosity - Use proper viscosity oil.
Damaged or seized piston rings - Replace piston rings.
Worn valve stems and valve guides - Change the valves.
Scuffed pistons or cylinder liners - Check pistons and liners, replace as required.
Coolant temperature is low - Warm up the engine.
Insufficient engine oil - Add oil to the engine crankcase.
Timing of fuel injection pump is incorrect - Use the correct fuel injection pump timing adjustment.
Pistons are worn or scored - Pistons replacement required.
Connecting rod misalignment or failure - Connecting rod must be aligned or replaced.
Battery capacity is low - Battery needs to be recharged.
Battery is draining quickly - Battery needs to be serviced or replaced.
Disconnected cables or faulty battery terminals - Check wiring connections and replace or clean terminals.
| Starter motor is not working |
Battery is low or faulty - Change or recharge battery.
Wiring is incorrectly connected or disconnected - Inspect wiring and connect correctly.
Low battery capacity - Charge the battery.
Starter motor is damaged - Repair or replace starter.
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