Deutz F6L912 Troubleshooting
| Engine Model: Deutz F6L912 |
| Engine Type: 4-cycle inline 6-cylinder direct injection air-cooled diesel |
| Total Displacement: 344.9 cu.in (5.65 L) |
| Rated Engine Power: 80-114 Hp (60-85 kW) at 2500 rpm |
| Aspiration Type: Naturally aspirated |
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| Engine hard to start or doesn't start |
Clogged fuel filter - Change the filter element.
Air in fuel system - Bleed fuel system.
Fuel injection nozzles are dirty or defective - Change fuel injection nozzles.
Damaged fuel injection pump - Replacement or repair required.
Valve timing is improper - Use correct valve timing adjustment.
Fuel pipes are plugged - Clean or change fuel pipes.
Wrong injection timing - Check injection timing adjustment.
Cylinder or piston rings are worn - Replace faulty components.
| Engine starts but stalls immediately |
Fuel filter element clogging - Service the filter.
Fuel injection pump is damaged - Change pump or rebuild it.
Air filter plugged - Change air filter element.
Nozzle opening pressure is incorrect - Set it correctly.
| Engine shuts off suddenly while running |
Timing of fuel injection pump is incorrect - Set the fuel pump timing correctly.
Fuel filter element clogging - Clean or change the filter.
Engine is not preheated - Warm up the engine.
Injection nozzles are jammed or clogged - Repair or replace injection nozzles.
Low idle speed setting is not correct - Adjust the low idle speed.
Improper valve clearance - Adjust valve clearance.
Faulty fuel injection pump - Replacement or repair required.
Fuel injection nozzles fault - If necessary, replace with a new nozzle.
Fuel lines or hoses are dirty - Service fuel lines and hoses.
Restricted intake air - Change air filter element.
Cylinder-head gasket is broken - Cylinder-head gasket replacement required.
Injection timing is improper - Check injection timing adjustment.
Fuel injection pump is faulty - Install a new pump or rebuild.
One of moving engine components is worn - Replace or repair damaged components.
Cooling fins are blocked - Wash or clean as required.
Fan belt is loose or defective - Replace the fan belt.
Engine oil level low - Need to add engine oil.
Cylinder head gasket is worn - Install a new gasket.
Injection timing is improper - Adjust injection timing as required.
| Oil pressure is insufficient |
Lack of oil - Check oil level and add oil as required.
Oil pump malfunction - Check and replace if necessary.
Oil filter is clogged - Replace or service engine oil filter.
Relief valve is stuck or worn - Replace or clean 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 leaks: Worn seals or gaskets - Replace to repair leaks.
Oil viscosity is wrong - Use oil of correct viscosity.
Damaged or seized piston rings - Change piston rings.
Valve guides or stems are damaged - Change the valves.
Scuffed cylinder liners or pistons - Check pistons and liners, change as required.
Engine is not fully warmed up - Engine is not warmed up to the required temperature.
Insufficient engine oil - Fill up the engine oil.
Timing of fuel injection pump is incorrect - Set the fuel pump timing correctly.
Pistons are scored or worn - Have pistons replaced.
Connecting rod is worn or not aligned - Connecting rod needs to be aligned or changed.
Battery power is low - Recharge the battery.
Battery is draining quickly - Battery needs service or replacement.
Disconnected battery cables or bad terminals - Connect wires correctly or change terminals.
Battery is discharged or worn - Charge or change the battery.
Disconnected or improperly connected wiring harness - Inspect battery wiring harness and connect as required.
Low battery voltage - Battery is drained, recharge it.
Starter motor is defective - Replace or repair starter.
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