DAF LF45, LF55 Series. Manual — part 325

©

200416

2-1

General

CE ENGINE INLET/EXHAUST SYSTEM

ΛΦ45/55 series

4

6

2. GENERAL

2.1 LOCATION OF COMPONENTS

1.

Wastegate diaphragm box

2.

Oil supply pipe

3.

Oil discharge pipe

4.

Turbocharger

5.

Exhaust manifold

3

4

5

1

2

i400840

CE ENGINE INLET/EXHAUST SYSTEM

2-2

©

200416

General

6

ΛΦ45/55 series

4

1.

Glow element connections

2.

Intake manifold

1

2

i400841

©

200416

2-3

General

CE ENGINE INLET/EXHAUST SYSTEM

ΛΦ45/55 series

4

6

2.2 SYSTEM DESCRIPTION, TURBOCHARGER WITH WASTEGATE

To make the engine more responsive at lower

engine speeds, a turbocharger is used that

produces a better charge ratio at these speeds.

Without provision having been made for this, the

boost pressure yielded by this turbocharger

would be too high at maximum engine speeds.

Use of a wastegate prevents this.

The boost pressure is measured by a diaphragm

box (1) on the delivery side of the turbocharger.

The diaphragm is pushed back against the spring

pressure by the boost pressure. The linked

control rod (2) is also pushed back. The control

rod operates a valve in the turbine housing (3).

The valve in the turbine housing is opened when

the maximum pre-set pressure has been

reached.

When the valve is opened, some of the exhaust

gases will be discharged directly to the exhaust

pipe rather than being used to propel the turbine

rotor of the turbocharger.

i400509

3

2

1

CE ENGINE INLET/EXHAUST SYSTEM

2-4

©

200416

General

6

ΛΦ45/55 series

4