Deutz F4L912 Troubleshooting
| Engine Model: Deutz F4L912 |
| Engine Type: 4-cycle inline 4-cylinder direct injection air-cooled diesel |
| Total Displacement: 229.9 cu.in (3.76 L) |
| Rated Engine Power: 47-74 Hp (35-55 kW) at 2500 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine starts up hard or will not start |
Dirty fuel filter - Change filter element.
Air in the fuel system - Air bleeding.
Clogged or burnt injection nozzle - If necessary, replace with a new nozzle.
Faulty fuel injection pump - Change or repair the pump.
Wrong valve timing - Correct or change timing gear.
Fuel pipes are dirty - Clean or replace fuel pipes.
Wrong injection timing - Set up as recommended.
Excessive wear of piston rings and cylinder - Change faulty components.
| Diesel starts and stalls immediately |
Clogged fuel filter - Install new filter element.
Fuel injection pump is broken - Repair or install a new fuel pump.
Clogged air cleaner - Clean or replace element.
Unadjusted nozzle opening pressure - Adjust as recommended.
| Diesel shuts off while driving |
Fuel injection timing is wrong - Check the fuel injection pump timing adjustment.
Dirty fuel filter - Service or replace the filter.
Engine is not preheated - Warm up the engine.
Injection nozzles are stuck or clogged - Change or repair injection nozzles.
Incorrectly set low idle speed - Correct low idle settings.
The valve clearance is not adjusted - Adjust valve clearance.
Fuel injection pump is not working correctly - Install a new pump or rebuild.
Defective injection nozzle - Inspect nozzles and replace if necessary.
Fuel hoses or lines are dirty - Clean fuel system hoses and lines.
Air filter clogged - Clean or change the filter.
Cylinder-head gasket is broken - Change cylinder head gasket.
Injection timing is improper - Use correct injection timing adjustment.
Fuel injection pump is defective - Install a new pump or rebuild.
Any of moving engine components is faulty - Repair or replace defective components.
Cooling fins are blocked - Wash or clean as required.
Fan belt is broken or worn - Change as required.
Low engine oil level - Fill up the engine oil.
Cylinder-head gasket is leaking - Cylinder-head gasket replacement required.
Wrong injection timing - Set up as recommended.
| Insufficient oil pressure |
Engine oil level low - Check and refill the oil.
Oil pump failure - Check and replace if necessary.
Oil filter is dirty - Replace or service engine oil filter.
Relief valve is stuck or worn - Change or clean relief valve.
Excessive crankshaft bearing clearance - Inspect and replace or repair faulty parts.
Clearance of crankpin bearing is excessive - Inspect and replace or repair faulty parts.
Oil leaks: Gaskets or seals are excessively worn - Install new components.
Oil viscosity is incorrect - Use oil of correct viscosity.
Worn or broken piston rings - Change piston rings.
Valve stems or guides are damaged - Change the valves.
Damaged pistons or cylinder liners - Inspect liners and pistons, replace as necessary.
| Abnormal engine knocking or noise |
Low coolant temperature - Warm up engine as required.
Not enough engine oil - Check and refill engine oil.
Timing of fuel injection pump is incorrect - Set it up as required.
Worn or broken pistons - Install new pistons.
Misaligned or defective connecting rod - Alignment procedure or replacement is required.
Low battery capacity - Charge the battery.
Battery won’t hold charge - Battery needs service or replacement.
Disconnected battery cables or bad terminals - Check cables and clean or change 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 voltage - Recharge the battery.
Starter motor failure - Starter should be changed.
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