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

©

200324

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

©

200324

General

7

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

©

200324

2-3

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

2-4

©

200324

General

7

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.