DAF CF65, CF75, CF85 Series . Manual - part 188

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 200351

4-1

CE-engine lubrication system

DIAGNOSTICS

ΧΦ65/75/85 series

2

1

4. CE-ENGINE LUBRICATION SYSTEM

4.1 INTRODUCTION

If there is a fault in the system, it is usually 
detected by the electronic unit in the form of a 
fault code. This fault code can be read out using 
DAVIE. The fault-finding table contains possible 
causes of symptoms not detected by the 
electronic unit. 

DIAGNOSTICS

4-2

©

 200351

CE-engine lubrication system

1

ΧΦ65/75/85 series

2

4.2 FAULT-FINDING TABLE

SYMPTOM: ENGINE OIL PRESSURE TOO LOW

Possible cause

Remedy

Engine oil level too low

Top up engine oil to maximum level

External oil leaks

Visually check the engine for leaks. Repair if 
necessary

Oil pressure switch defective

Check the switch Replace if necessary

Oil does not meet the required specifications

Change the engine oil and the oil filter

Oil temperature is too high

Check the oil cooler

Oil mixed with coolant or fuel

Change the engine oil and the oil filter

Oil passage pipe or oil suction pipe loose or broken Check oil pipes. Repair if necessary

Oil pressure control valve fails to operate

Check the oil pressure control valve

Inadequate functioning of oil pump

Check the oil pump

Main or big-end bearings worn out

Check main or big-end bearings

Piston cooler oil nozzle has come loose

Check oil nozzle. Replace if necessary

Defective internal oil pressure pipes or seals

Check the oil pressure pipes and seals

Fouling between oil pressure control valve and 
seat

Check/clean the oil pressure control valve

Oil filter fouled

Replace the oil filter

SYMPTOM: ENGINE CONSUMES TOO MUCH OIL

Possible cause

Remedy

Inlet system failure

Check the inlet system

Exhaust system failure

Check the exhaust system

Oil cooler leaks

Check whether there is lubricating oil in the engine 
cooling system

Oil temperature is too high

Check that the correct oil cooler has been installed

Excessive blow-by

Check the compression pressure and carry out a 
cylinder leak test
Check the condition of the piston rings and cylinder 
liners

Worn piston rings and/or cylinder liners

Replace the piston rings and/or cylinder liners
Check the air inlet system
Check the oil specifications

Injector O-ring damaged or not present

Check the injector seal

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5-1

PE/XE engine, general

DIAGNOSTICS

ΧΦ65/75/85 series

2

1

5. PE/XE ENGINE, GENERAL

5.1 INTRODUCTION

If there is a fault in the system, it is usually 
detected by the electronic unit in the form of a 
fault code. This fault code can be read out using 
DAVIE. The fault-finding table contains possible 
causes of symptoms not detected by the 
electronic unit. 

DIAGNOSTICS

5-2

©

 200351

PE/XE engine, general

1

ΧΦ65/75/85 series

2

5.2 FAULT-FINDING TABLE, ENGINE FUNCTIONS

SYMPTOM: ENGINE CAN BE STARTED, BUT DOES NOT RUN

Possible cause

Remedy

Poor fuel quality

Drain fuel, flush fuel system, replace the fuel filters 
and fill fuel tank with fuel

Air in fuel system

Check for drawing in of air:
-

via the suction pipe

-

via the fuel lift pump seal

Fuel filter(s) blocked

Replace the fuel filter and clean the system

No fuel supply/fuel lift pump defective; no delivery

Check:
-

the fuel level

-

the pipes for blockage and leaks

-

the fuel lift pump

Pressure relief valve on pump housing does not 
shut off

Check the pressure relief valve

SYMPTOM: ENGINE STALLS AND RUNS AGAIN AFTER RE-STARTING

Possible cause

Remedy

Air in fuel system

Check for drawing in of air:
-

via the suction pipe

-

via the fuel lift pump seal

Pressure relief valve on pump housing does not 
shut off

Check the pressure relief valve

SYMPTOM: ENGINE STARTS POORLY

Possible cause

Remedy

Poor fuel quality

Drain fuel, flush fuel system, replace the fuel filters 
and fill fuel tank with fuel

Air in fuel system

Check for drawing in of air:
-

via the suction pipe

-

via the fuel lift pump seal

Fuel filter clogged

Replace the fuel filter and clean the system

Mechanical defect or clogging in pump units

Replace the pump units

Injectors defective

Check the injectors

Pressure relief valve on pump housing does not 
shut off

Check the pressure relief valve

Fuel lift pump delivery too low

Check the fuel lift pump and replace if necessary