Scania 16 litre engine. Work Description - part 15

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Fitting

Tightening torques

Description

1

Clean the sealing surfaces. Carefully 
remove any remains of the old gasket.

2

Fit the flywheel housing with a new gasket. 
The two appendages, A and B, are to be 
removed and used for bolts A and B.

3

Fit the bolts. Torque tighten the M12 bolts 
and studs to 92 Nm and the M10 bolts to 
50 Nm.

Bolts for flywheel housing

Flange bolt and stud, 
M12 : 92 Nm

Flange bolt, M10 : 50 Nm

Nut for turbocharger manifold

92 Nm

Bolts for oil sump

32 Nm

Plug for oil sump

80 Nm

112 295

M12

M10

M12

M12

M10

M10

A

B

A

B

M10

M12

Flywheel housing

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4

Fit the oil sump with a new gasket. Torque 
tighten the bolts to 32 Nm.

5

Fit the power take-off or the cover for the 
power take-off.

6

Fit the turbocharger and the turbocharger 
manifold, torque tighten the nut to 92 Nm.

7

Fit the exhaust manifold, intake manifold 
and exhaust pipe from the turbocharger.

8

Fit the compressor.

9

Fit the starter motor and the cables to the 
starter motor.

10 Fit the flywheel as described in Flywheel, 

fitting.

11 Fit the engine speed sensors. Fit a new 

O-ring onto the camshaft sensor.

12 Fit the oil pipe to the turbocharger.

Flywheel housing

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Closed crankcase 
ventilation

General

The prefilter and paper filter must be renewed as 
described in the maintenance instructions.

The system is fitted with a fluid trap. There must 
always be oil in the fluid trap. If the system has 
been emptied, pour approximately 1 dl oil on the 
bottom of the filter housing to fill the fluid trap.

Troubleshooting

Increased blow-by in engine

Blow-by is the flow of gases through the engine 
crankcase and out via the crankcase ventilation.

The closed crankcase ventilation system is very 
sensitive to changes to the blow-by in the 
engine. If the blow-by increases, the amount of 
gas passing through the crankcase ventilation 
will also increase. The crankcase gases can then 
take with it small drops of oil from the 
crankcase. When the amount of oil increases, 
the oil separator will not be able to fulfil its task 
of separating the oil. Oil will then accompany 
the air into the charge air system.

Causes of an increase in blow-by are leaking 
piston rings, valve guides, turbocharger or 
compressor.

Too much oil in the oil sump

If the engine is filled with too much oil, the 
excess will splash around in the crankcase and 
be atomized. This means that the crankcase 
gases will contain a large amount of atomized 
oil that the crankcase ventilation will not be able 
to separate the oil properly. This will result in a 
large increase of oil from the crankcase 
ventilation.

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Crankcase ventilation

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Air leak in the crankcase

In a well-functioning closed crankcase 
ventilation system, there should be a certain 
amount of vacuum in the crankcase. If air enters 
the crankcase from outside, the flow of gas from 
the crankcase through the crankcase ventilation 
will increase. This is the equivalent of increased 
blow-by and will lead to an increase in oil.

An air leak in the crankcase can be caused by:

•

A defective diaphragm in the valve housing.

•

Poorly fitted oil filler cap.

•

Defective rubber plug on the oil dipstick 
handle.

•

Worn brake compressor.

Damaged turbocharger

Oil can leak into the charge air system from a 
damaged turbocharger.

Refer to Workshop Manual 01:03-02, 
Turbocharger, for checking the turbocharger.

Crankcase ventilation