Scania 16 litre engine. Work Description — part 8

0101w14b.mkr

©

29

14 Remove the bearing bracket.

15 Remove the pushrods.

Note: The pushrod for the unit injector is
secured with a retaining ring. Jiggle and pull
carefully on the pushrod to loosen it.

16 Remove the valve yokes.

17 Disconnect the cables on the unit injector

and pull them out through the opening in the
rocker cover.

18 Remove the lower rocker cover.

19 Remove the screw for the fork clamp

holding the unit injector in place.

Note: Do not lift the unit injector by its spring,
the spring can come loose.

20 Turn the unit injectors clockwise until they

stop. Place the slide hammer 87 596
between the solenoid valve and the edge of
the lower rocker cover as illustrated.

114 728

17

14

18

15

16

19

Place the slide hammer as indicated by the
arrow

116 271

111 685

87 596

21 Pull out the unit injector. If the unit injector

is stuck, tap carefully with a rubber mallet
on the solenoid valve housing.

22 Remove the cylinder head. Mark the

cylinder heads if more than one is being
removed at the same time.

Cylinder head

30

©

0101w14b.mkr

Fitting

Tightening torques

Special tools

Cylinder head bolts

First stage

60 Nm

Second stage

150 Nm

Third stage

250 Nm

Fourth stage

90

°

Screws for lower rocker cover

26 Nm

Bolt for fork on unit injector.

20 Nm + 75

°

Bearing bracket and rocker arm shaft

105 Nm

Screw for upper rocker cover

18 Nm

Adjusting screw lock nut on rocker arm for unit injector

39 Nm

Adjusting screw lock nut on rocker arm for valves

35 Nm

Cable connection, unit injector

2 +/- 0,2 Nm

Bolt for exhaust manifold

63 Nm

Screw for fuel manifold

26 Nm

Banjo screw for overflow line

11 Nm

Number

Designation

Illustration

Tool board

99 308

Sleeve

D 5

99 365

Setting tool

Measuring tool cabinet

588 179

Torque screwdriver

99 365

C

112 104

588 179

Cylinder head

0101w14b.mkr

©

31

1

Check liner height, refer to section on
pistons and cylinder liners.

2

Fit a new cylinder head gasket.

3

The cylinder head bolts can be reused up to
3 times. Therefore, make sure the bolts have
no more than 2 punch marks on top of the
bolt head. If any of the bolts has 3 marks, it
must be replaced with a new one.

4

Lubricate the threads and underneath the
heads of the cylinder head bolts. Tighten
them in the following four stages in the
order given in the figure.

•

Torque tighten all bolts to 60 Nm.

•

Torque tighten all bolts to 150 Nm.

•

Torque tighten all bolts to 250 Nm.

•

Finally, tighten all bolts an
additional 90

°.

•

Make a mark with a centre punch on the
head of the bolt.

5

Fit the lower part of the rocker cover and
torque tighten the screws to 26 Nm.

1

2

3

4

5

6

01_1396

Cylinder head

32

©

0101w14b.mkr

6

Make sure there is not an old seal at the
bottom of the injector aperture. Clean the
sealing surfaces in the injector aperture.

IMPORTANT! Always fit new O-rings and
seals to unit injectors that have been removed.
Make sure all sealing surfaces are clean.

107 512

7

Lubricate the unit injector O-rings with red
O-ring grease, part No. 1 402 039.

8

Fit a new seal on the unit injector. A rubber
insert will keep the seal in place on the unit
injector.

9

Place the fork clamp with screw in position
on the unit injector and insert it into the
cylinder head. Press down the unit injector
by hand as far as possible.

107 513

10 Torque tighten the screw to 20 Nm and then

a further 75°. There are two marks in the
rocker cover with a 75° angle between them.

A

B

75

o

116 559

Cylinder head