DAF 95XF. Manual — part 383
4
DIAGNOSIS
XF engine inlet and exhaust system
95
XF series
3-2
FAULT: RISING AND FALLING TURBOCHARGER SOUNDS
Possible cause
Remedy
Blocked air inlet to turbocharger.
Check air inlet and remove any obstacles.
Compressor side of turbocharger contaminated.
Clean compressor side with a non-corrosive
cleaning agent or a soft brush. Check the inlet
side for carbon deposits or other contamination.
Damaged turbocharger.
Replace turbocharger and identify the cause.
FAULT: BLACK SMOKE EMERGING FROM EXHAUST
Possible cause
Remedy
Air cleaner element blocked.
Clean or replace air cleaner element.
Air leak between turbocharger and inlet
manifold.
Check pipes and pressurise inlet unit.
Air leak between inlet manifold and cylinder
head.
Check for leaks. Replace gaskets, if necessary.
Compressor side of turbocharger contaminated.
Clean compressor side with a non-corrosive
cleaning agent or a soft brush. Check the inlet
side for carbon deposits or other contamination.
Gas leak between exhaust manifold and cylinder
head.
Check attachment bolts and gaskets.
Gas leak between exhaust manifold and
turbocharger.
Check attachment bolts and gaskets.
Damaged turbocharger.
Replace turbocharger and identify the cause.
1
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4
95
XF series
XF engine inlet and exhaust system
DIAGNOSIS
3-3
FAULT: BLUE SMOKE EMERGING FROM EXHAUST
Possible cause
Remedy
Air cleaner element blocked.
Clean or replace air cleaner element.
Air leak between turbocharger and inlet
manifold.
Check pipes and pressurise inlet unit.
Air leak between inlet manifold and cylinder
head.
Check for leaks. Replace gaskets, if necessary.
Compressor side of turbocharger contaminated.
Clean compressor side with a non-corrosive
cleaning agent or a soft brush. Check the inlet
side for carbon deposits or other contamination.
Turbocharger oil discharge pipe is blocked.
Check oil pipe. Replace if necessary.
Damaged turbocharger.
Replace turbocharger and identify the cause.
FAULT: OIL LEAK AT TURBINE SIDE OF TURBOCHARGER
Possible cause
Remedy
Compressor side of turbocharger contaminated.
Clean compressor side with a non-corrosive
cleaning agent or a soft brush. Check the inlet
side for carbon deposits or other contamination.
Turbocharger oil discharge pipe is blocked.
Check oil pipe. Replace if necessary.
Damaged turbocharger.
Replace turbocharger and identify the cause.
FAULT: OIL LEAK AT COMPRESSOR SIDE OF TURBOCHARGER
Possible cause
Remedy
Air cleaner element blocked.
Clean or replace air cleaner element.
Olieleiding turbo verstopt.
Check oil pipe. Replace if necessary.
Damaged turbocharger.
Replace turbocharger and identify the cause.
1
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0008
4
DIAGNOSIS
XF engine inlet and exhaust system
95
XF series
3-4
FAULT: EXHAUST BACK PRESSURE TOO HIGH
Possible cause
Remedy
Incorrect butterfly valve setting.
Check the setting of the butterfly valve.
Butterfly valve incorrectly positioned.
Check whether the butterfly valve has been
positioned correctly.
Butterfly valve partially operated by residual
pressure in the operating cylinder.
Check operating cylinder.
No original exhaust silencer fitted.
Check exhaust silencer.
Exhaust pipe crushed or internally blocked by a
loose part.
Check exhaust system for blockage and/or
damage.
FAULT: INLET UNDERPRESSURE TOO HIGH
Possible cause
Remedy
Blocked air cleaner.
Check air cleaner element.
Obstruction in intake ducts at the rear of the cab.
Check the intake ducts.
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4
95
XF series
XF engine brake
DIAGNOSIS
4-1
4. XF ENGINE BRAKE
4.1
FAULT-FINDING TABLE
FAULT: EXHAUST BRAKE DOES NOT ENGAGE
Possible cause
Remedy
Compressor delivers insufficient air pressure.
Check the operation of the compressor.
Defective engine stop valve.
Check engine stop valve.
Air leak in the air pipe from air drier to engine
stop valve.
Check air pipe.
Butterfly valve stuck in butterfly valve housing.
Check free movement of butterfly valve.
Defective engine stop operating cylinder.
Check operating cylinder.
Electrical fault.
Check electrical circuit.
FAULT: EXHAUST BRAKE REMAINS ENGAGED
Possible cause
Remedy
Defective engine stop valve.
Check engine stop valve.
Defective engine stop operating cylinder.
Check operating cylinder.
Butterfly valve stuck in butterfly valve housing.
Check free movement of butterfly valve.
Electrical fault.
Check electrical circuit.
FAULT: DEB CANNOT BE SWITCHED ON
Possible cause
Remedy
Electrical fault.
Check electrical circuit.
Engine oil pressure too low.
Check engine oil pressure.
1
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0008
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