DAF LF45, LF55 Series. Manual — part 160
©
200505
3-1
BE/CE engine cooling system
DIAGNOSTICS
ΛΦ45/55 series
2
1
3. BE/CE ENGINE COOLING SYSTEM
3.1 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
3-2
©
200505
BE/CE engine cooling system
1
ΛΦ45/55 series
2
3.2 FAULT-FINDING TABLE
SYMPTOM: ENGINE TEMPERATURE INCREASES
Possible cause
Remedy
Incorrect injectors installed
Check whether the correct injectors have been
installed
Inlet system failure
Check the inlet system
Lubrication system failure
Check the lubrication system
Incorrect poly-V-belt tension
Check the poly-V-belt tensioner or replace the
poly-V-belt
Insufficient coolant
Check the coolant level. Top up if necessary
Coolant hose torn or clogged
Check the coolant hoses
Air cooler and cooling system radiator fouled
Check/clean the air cooler and cooling system
radiator
Wastegate setting is too high
Check the wastegate setting
Air hose from the turbocharger housing to the
wastegate diaphragm leaks or is not connected
Check the air hose. Replace if necessary.
Incorrect or malfunctioning pressure cap
Check the pressure cap
Thermostat opens insufficiently or not at all
Check the thermostat and its operation
Coolant pump defective
Check the coolant pump shaft, bearings and
impeller. Replace the coolant pump if necessary
Viscous fan defective
Check operation of the viscous fan
Poor fuel quality
Drain fuel, flush fuel system, replace the fuel filters
and fill fuel tank with fuel
©
200505
3-3
BE/CE engine cooling system
DIAGNOSTICS
ΛΦ45/55 series
2
1
SYMPTOM: EXTERNAL COOLANT LEAKAGE
Possible cause
Remedy
Coolant hoses defective
Check the coolant hoses
Coolant pipes defective
Check the coolant pipes
Radiator leaking
Check the radiator. Pressure-test if necessary
Coolant pump leaking
Check coolant pump. If necessary, measure
bearing play
Defective oil cooler
Inspect the oil cooler. Pressure-test if necessary
Defective pressure cap
Check the pressure cap. Pressure-test if
necessary
Heater leaking
Check the heater hoses
SYMPTOM: INTERNAL COOLANT LEAKAGE
Possible cause
Remedy
Defective cylinder head gasket
Check the cylinder head gasket
Cracked cylinder head or cylinder block
Check the cylinder head and cylinder block for
internal cracks. Pressure-test if necessary
Defective compressor cylinder head gasket
Replace the compressor cylinder head gasket
Defective oil cooler
Check whether there is coolant in the lubrication
system
Defective expansion plugs in cylinder block or
cylinder head
Replace the leaking expansion plug(s)
DIAGNOSTICS
3-4
©
200505
BE/CE engine cooling system
1
ΛΦ45/55 series
2
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