Scania 16 litre engine. Work Description — part 17

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Crank mechanism

Exploded view drawing

Crank mechanism

1

2
3

4

5

6

7

8

9

10

11

12

13

14

15

5

11

5

2

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1

Piston

2

Compression ring

3

Compression ring

4

Oil scraper ring

5

Retaining ring

6

Gudgeon pin

7

Connecting rod

8

Bearing bushing

9

Bearing shell

10 Bearing cap

11 Flange bolt

12 Crankshaft

13 O-ring

14 Cylinder liner

15 O-ring

Crank mechanism

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0110w14b.mkr

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

Crank mechanism

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Piston and connecting rod

Removing

1

Remove the cylinder head as described in
Cylinder head, removing.

2

Remove the oil sump.

3

Remove the piston cooling nozzle in the
cylinder block.

IMPORTANT! The piston cooling nozzle must
not be damaged. The oil jet must hit the piston
precisely. If it does not, the piston will become
too warm and result in engine breakdown.
Damaged nozzles must not be re-aligned, renew
them instead.

4

Remove the bearing cap and bearing shells.
Protect the oilway in the crankshaft e.g. by
winding tape around it with the adhesive
side out.

5

Mark the piston before removing it. The
parts must be refitted in the same place and
position. Lift out the piston and connecting
rod.

Note: Always check the connecting rod as
described in Connecting rod, checking, if the
cylinder has seized, been filled with water or
had a broken valve. Bent connecting rods must
not be straightened.

Piston and connecting rod

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Fitting

Tightening torques

Special tools

Description

1

Lubricate the piston, piston rings, cylinder
liner and piston ring compressor with
engine oil.

2

Remove the protection on the connecting
rod race and lubricate the race.

3

Turn the piston rings so that the gaps are
distributed around the piston.

4

Fit the upper connecting rod bearing shell
and lubricate the bearing surface.

Bolts for oil sump

32 Nm

Connecting rod bolts

50 Nm + 90°

Piston cooling nozzle

23 Nm

Number

Designation

Illustration

Tool board

98 212

Piston ring compressor

D3

Piston and connecting rod