DAF CF65, CF75, CF85 Series . Manual - part 240

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2-1

General

PE ENGINE LUBRICATION SYSTEM

CF65/75/85 series

2

7

2. GENERAL

2.1 SYSTEM DESCRIPTION, LUBRICATION SYSTEM

M200909

PE ENGINE LUBRICATION SYSTEM

2-2

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General

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CF65/75/85 series

2

General
The oil pump (1) is directly driven by the 

crankshaft via an intermediate gear wheel.

The oil pump (1) draws the lubricating oil from the 

oil sump, and pumps it via the oil cooler (2) and 

the oil filter (3) to the main oil channel (4) in the 

cylinder block. From the main oil channel, the 

lubricating oil is further distributed to the various 

components requiring lubrication.

Oil cooler
The lubricating oil cooler (2) is connected to the 

cooling system. It warms up the lubricating oil in 

a "cold" engine and cools it in a "warm" engine.

Parallel to the lubricating oil cooler, a bypass 

valve (S1) has been installed. If the lubricating oil 

cooler is blocked, or in the event of extremely low 

temperatures, the bypass valve will open at a 

pressure difference of about 2 bar. In this 

situation, uncooled lubricating oil will enter the 

lubrication system.

Centrifugal filter
A centrifugal filter (17) may be included parallel to 

the lubrication system. In this case, lubricating oil 

will flow from the oil cooler to the centrifugal filter. 

In the centrifugal filter, the lubricating oil 

undergoes extra filtering.

M201280

Rocker

assembly

Idler gear/

timing gears

Piston

pin 11

Piston 12

Piston

rod 10

Fandrive

gear

Pump

1

5

8

S1

Oil cooler

Centrifugal

filter

S2

P

15

9

6

13

14

16

DEB unit/

Oilstrip

Camshaft

7

Crankshaft

UPEC pump

Compressor

Turbo

charger

4

3

2

17

Main duct

Filter

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General

PE ENGINE LUBRICATION SYSTEM

CF65/75/85 series

2

7

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
The oil is cleaned in the oil filter cartridge. A 

pressure-relief valve (S2), fitted in this filter, 

opens if the pressure in the filter becomes too 

high as a result of fouling or cold lubricating oil. 

The lubricating oil then passes through the filter 

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.

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).

The other rocker shafts are provided with 

lubricant by lubricating-oil strips (16) that run 

along the rocker seats.

Timing gear
A lubricating oil channel leads from the lubricating 

oil duct via the first crankshaft main bearing (7) 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 PE engine has 

no fan drive (5).

Piston and gudgeon pin
The pistons (12) and the upper big-end bearings 

(11) are lubricated by means of lubricating oil 

nozzles connected to the main oil channel (4). In 

addition to its lubricating function, the lubricating 

oil has an important cooling function.

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.

PE ENGINE LUBRICATION SYSTEM

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General

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CF65/75/85 series

2

Turbocharger and air compressor
A lubricating oil channel running from a camshaft 

bearing 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 oil 

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 oil sump.

Pump housing
The pump housing (6) obtains lubricating oil from 

the cylinder block and discharges it through a 

channel in the cylinder block, from where it 

returns to the oil sump. The pump units are 

supplied with lubricating oil via a channel in the 

pump housing.