Scania 16 litre engine. Work Description — part 31

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121

Turbocharger

Exploded view drawing

Turbocharger

5

4

1

2

3

6

7

9

12

10

11

8

116 685

1

Straight union

2

Gasket

3

Lubrication oil pipe

4

Ferrule

5

Nut

6

Straight union

7

Gasket

8

Lubrication oil return pipe

9

Gasket

10 Flange bolt

11 Gasket

12 Flange bolt

Turbocharger

General tightening torques

Specifications

A tolerance of +/- 15% applies to the specified
tightening torques unless stated otherwise.

The following tightening torques apply in general unless otherwise
specified:

Flange bolt M6

8.6 Nm

Flange bolt M8

26 Nm

Flange bolt M10

50 Nm

Flange bolt M12

92 Nm

Stud in casting M8

13 Nm

Stud in casting M10

25 Nm

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Important information

Observe strict cleanliness at all times when
working on the turbocharger. Never leave
connections for oil inlets or outlets unprotected.
Foreign bodies in the bearing housing can soon
lead to a total breakdown.

Oil leaks

A blocked air filter creates excess vacuum in the
inlet line. There is then a risk of oil mist being
drawn from the bearing housing.

If the sealing ring on the turbine side is worn,
the exhaust gases will be blue when idling.

If the oil outlet pipe from the turbocharger is
damaged, there is risk of oil leaking out.

Foreign bodies

Foreign bodies in the turbine or compressor, e.g.
a grain of sand or metal shavings, will ruin the
vanes. This will lead to imbalance and bearing
wear. Engine power will drop.

IMPORTANT! Never attempt to straighten a
damaged vane. It will break off when running
and the turbocharger will break down
completely, causing damage to the engine.

Turbocharger

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Air and exhaust leaks

Even small leaks in the line between the air filter
and the turbocharger will cause dirt to be
deposited on the compressor wheel. The charge
pressure will be reduced, resulting in increased
exhaust temperature and smoke, which will
reduce the service life of the engine.

Leaks in the exhaust line between the cylinder
head and the turbocharger will also result in loss
of charging pressure.

Measuring charging
pressure

Tools for Scania Diagnos

SCANIA Diagnos

00_1521

Cleaning

Low charging pressure can sometimes be due to
dirt in the compressor housing. Unscrew the
compressor housing and clean with white spirit
and a brush. Renew the O-ring if it is damaged.
Assemble the compressor housing and measure
the charging pressure again.

Turbocharger

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Measuring radial and axial play

Specifications

Special tools

Measuring radial and axial play often does not
give a good indication of the remaining service
life of the turbocharger.

When the turbocharger seems to be functioning
poorly or noisily, measuring the charging
pressure or radial and axial play can indicate
whether the turbocharger is at fault.

Wear limits

Turbine shaft play

max. 0.611 mm

Turbine shaft axial play

max. 0.102 mm

Number

Designation

Illustration

Tool board

98 075

Dial gauge

D2

587 107

Rocker indicator

587 250

Magnetic stand

M1

10

20

30

40

50

60

70

80

90

0

10

20

30

40

50

60

70

80

90

15

10

5

00_1637

98 075

0

0_1569

102350

Turbocharger