DAF LF45, LF55 Series. Manual - part 183

©

 200505

1-1

Safety instructions

BE ENGINE LUBRICATION SYSTEM

ΛΦ45/55 series

2

4

1. SAFETY INSTRUCTIONS

1.1 SAFETY INSTRUCTIONS

Fuel

Diesel fuel is an extremely 

flammable liquid, and must not be 

exposed to naked flames or come 

into contact with hot surfaces. The 

diesel fuel fumes remaining in an 

empty fuel tank form an extremely 

explosive mixture.

When fuel system components are being 

removed, some fuel will escape.

To keep this spillage to a minimum, unscrew the 

tank cap to release any overpressure.

Any spilled fuel must be collected, bearing in 

mind the risk of fire.

Exhaust gases
Do not run the engine in an enclosed or 

unventilated area.

Make sure exhaust fumes are properly extracted.

Exhaust gases contain carbon 

monoxide.

Carbon monoxide is a deadly 

colourless and odourless gas, 

which, when inhaled, deprives the 

body of oxygen, leading to 

asphyxiation. Serious carbon 

monoxide poisoning may result in 

brain damage or death.

Moving parts
Remain at a safe distance from rotating and/or 

moving components.

Various fluids
Various oils and lubricants used on the vehicle 

may constitute a health hazard.

This also applies to engine coolant, windscreen 

washer fluid, refrigerant in air-conditioning 

systems, battery acid and clutch fluid.

So avoid inhaling and direct contact.

Electrical short-circuit
Always disconnect the battery's earth connection 

during repair or maintenance operations for 

which the electric power supply is not required.

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BE ENGINE LUBRICATION SYSTEM

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©

 200505

Safety instructions

4

ΛΦ45/55 series

2

©

 200505

2-1

General

BE ENGINE LUBRICATION SYSTEM

ΛΦ45/55 series

2

4

2. GENERAL

2.1 SYSTEM DESCRIPTION, LUBRICATION SYSTEM

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

the crankshaft via an idler gear.

The lubricating oil pump draws the oil from the oil 

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

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

the cylinder block. From the main oil channel, the 

lubricating oil is further distributed to the various 

components requiring lubrication.

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

system. The oil cooler warms up the lubricating 

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

engine.

M201120

B

A

B

A

C

E

F

D

5

E

F

F

A

D

5

3

5

2

4

1

A

From lubricating oil pump

B

To oil cooler

C

To lubricating oil pump

D

From oil cooler

E

To oil filter

F

To main oil channel

BE ENGINE LUBRICATION SYSTEM

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©

 200505

General

4

ΛΦ45/55 series

2

Pressure-limiting valve
A pressure limiting valve (4) is fitted in the oil 

cooler housing.

When the pressure set for the pressure limiting 

valve has been reached, the valve opens and 

allows the excess lubricating oil to be discharged 

to the supply side of the lubricating oil pump.

Oil filter
The oil is cleaned in the disposable oil filter (3). A 

pressure relief valve (5) fitted in the oil cooler 

housing opens if the pressure in the filter 

becomes too high as a result of contamination or 

cold oil. The oil then passes through the filter 

unfiltered.

Main oil channel
From the main oil channel, lubricating oil is 

supplied to the crankshaft main bearings (A) and 

via an oil channel in the crankshaft also to the big-

end bearings.

From the main oil channel, lubricating oil is 

pumped to the camshaft.

M201260

A

B