DAF CF65, CF75, CF85 Series . Manual — part 270
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200324
2-3
General
XE ENGINE LUBRICATION SYSTEM
CF65/75/85 series
2
10
Pressure limiting valve
A pressure limiting valve (P) is installed in the
lubricating system after the lubricating oil cooler.
When the pressure set for the pressure limiting
valve has been reached, the valve opens and any
excess cooled lubricating oil will be discharged to
the sump.
Oil filter cartridge
The lubricating oil is cleaned in the oil filter (3). A
pressure relief valve (S2), fitted in this filter
housing, opens if the pressure in the oil filter
becomes too high as a result of fouling or cold
lubricating oil. The lubricating oil then passes
through the oil filter cartridge unfiltered.
Main lubricating oil channel
From the main lubricating oil channel (4)
lubricating oil is supplied to the crankshaft main
bearings (7) and via an oil channel in the
crankshaft to the big-end bearings (10).
From the main lubricating oil channel, lubricating
oil is pumped through the first camshaft bearing
(9) into the bored camshaft. At the end of the
camshaft there is a sealing plug.
From the lubricating oil channel in the camshaft,
lubricating oil is supplied to the other camshaft
bearings.
Cylinder head
From the second and fifth camshaft bearings, a
lubricating oil channel runs through the cylinder
heads to the second and fifth rocker seats (15).
Depending on the model, the other rocker shafts,
rockers, and bridge pieces are supplied with
lubricating oil by the DEB or a lubricating oil strip
(16).
Timing gear
From the lubricating oil channel leading to the first
crankshaft main bearing (7), another lubricating
oil channel goes to the bored hub of the idler gear
(8). From the bored hub, the lubricating oil
reaches the idler gear. From the idler gear, the
lubricating oil is supplied to the other gears.
The fan drive (5) is lubricated through a bore in
the cylinder block and a lubricating oil channel in
the timing case.
XE ENGINE LUBRICATION SYSTEM
2-4
©
200324
General
10
CF65/75/85 series
2
Piston and big-end bearings
The pistons (12) and the upper big-end bearings
(11) are lubricated by means of lubricating oil
nozzles connected to the main lubricating oil
channel (4). In addition to its lubricating function,
the lubricating oil has an important cooling
function. Depending on the engine type, the
pistons may be equipped with extra lubricating oil
channels to achieve better cooling.
A bore at the top of the connecting rod ensures
that the lubricating oil sprayed against the piston
head by the lubricating oil nozzles can reach the
upper big-end bearing.
Turbocharger and air compressor
A lubricating oil channel running from the main
lubricating oil channel is connected to the
lubricating oil pipes leading to the turbocharger
(14) and air compressor (13).
The lubricating oil discharge pipe from the
turbocharger is connected to a channel in the
cylinder block, from where the oil returns to the
sump.
The lubricating oil returning from the air
compressor flows from the front of the air
compressor back to the timing gear, and from
there to the sump.
Pump housing
The pump housing (6) is lubricated from the
cylinder block and it discharges the oil through a
channel in the cylinder block, from where the
lubricating oil returns to the sump. The pump
units are supplied with lubricating oil via a
channel in the pump housing.
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200324
3-1
Inspection and adjustment
XE ENGINE LUBRICATION SYSTEM
CF65/75/85 series
2
10
3. INSPECTION AND ADJUSTMENT
3.1 CHECKING ENGINE OIL CONSUMPTION
Engine oil consumption relates to the engine oil
used during combustion in the engine. Since
engine oil consumption is affected by driving style
and the use to which the vehicle is put, it is also
related to average fuel consumption. See
"Technical data" for the maximum permissible
engine oil consumption.
Test conditions
1.
An engine oil consumption test is only
meaningful after the engine has been run in
(approx. 25,000 km).
2.
Check the engine carefully for engine oil
leakage before carrying out an engine oil
consumption test. First repair any leaks.
3.
Check the average fuel consumption and
engine oil consumption as accurately as
possible.
4.
Only check the engine oil level when the
engine is at operating temperature and only
when the engine has been turned off for five
minutes.
5.
Make sure the vehicle is horizontal before
checking the engine oil level.
XE ENGINE LUBRICATION SYSTEM
3-2
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200324
Inspection and adjustment
10
CF65/75/85 series
2
3.2 INSPECTION, LUBRICATING OIL PRESSURE
1.
Bring the engine up to operating
temperature.
2.
Remove the lubricating oil pressure sensor.
This sensor is mounted on the oil filter
housing.
3.
In the oil pressure sensor connection, fit a
lubricating oil pressure gauge and the
special tool (DAF no. 0535551).
4.
Start the engine and measure the lubricating
oil pressure at idling speed and at full-load
engine speed. Compare the pressure
readings with the technical data. See
"Technical data".
Note:
The pressure limiting valve mounted in the
oil sump cannot be adjusted.
5.
Switch off the engine and remove the
lubricating oil pressure gauge. Fit a new
sealing ring to the oil pressure sensor and fit
the sensor.
M201089
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