DAF CF65, CF75, CF85 Series . Manual - part 270

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General

XE ENGINE LUBRICATION SYSTEM

CF65/75/85 series

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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

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General

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CF65/75/85 series

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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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3-1

Inspection and adjustment

XE ENGINE LUBRICATION SYSTEM

CF65/75/85 series

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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

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Inspection and adjustment

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CF65/75/85 series

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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