Scania 16 litre engine. Work Description — part 5

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17

Adjusting the valve clearance and unit injector

Specifications

Valve clearance, intake valve (cold engine)

0.45 mm

Valve clearance, exhaust valve (cold engine)

0.70 mm

Dimension for unit injector (cold engine)

66.9+/-0.1 mm

Tightening torques

Adjusting screw lock nut on rocker arm for unit injector

39 Nm

Adjusting screw lock nut on rocker arm for valves

35 Nm

Special tools

Number

Designation

Illustration

Tool board

99 309

Tool for turning flywheel

D 5

99 365

Setting tool

Measuring tool cabinet

100330

99 365

109

991

C

Cylinder head

18

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Note: Check and adjust the valve clearance and
unit injector with the engine cold.

Use tool 99 309 to turn over the engine.

99 309

01_1388

Adjusting the valve clearance

Check the valve clearance using a feeler gauge
and use the adjusting screw on the rocker arm to
set the correct clearance.

The intake valves are governed by the short
rocker arms and the exhaust valves by the long
rocker arms.

Make sure the valve yoke is resting against the
valves correctly.

The intake valve clearance should be 0.45 mm
and exhaust valve clearance 0.70 mm.

Cylinder head

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19

Adjusting the unit injector

IMPORTANT! Adjust roughly first with a
sliding caliper and then fine adjust using the
setting tool 99 365. If both adjustments are not
carried out, the unit injector may attain an
incorrect position, which will result in poor
performance and possible breakdown.

5

Screw the rocker arm lock bolt 1 while
measuring the distance between plane a and
the top of the valve spring collar with a
sliding caliper. The distance should be
66.9 mm.

a

0.1

+ −

110 045

66.9

1

6

Place setting tool 1 (99 365) on reference
gauge 2. Zero the setting tool by rotating the
dial indicator 1A.

1

1A

2

112 7

55

7

Finely adjust the unit injector so that the
distance between plane a and the top of the
valve spring collar is 66.9+/-0.1 mm.

107 515

99 365

8

Torque tighten the lock nut to 39 Nm.

Cylinder head

20

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Order of adjustment

Rotate the flywheel using tool 99 309 so that the
mark on the flywheel is visible in the bottom
window according to the table below.

It is a good idea to mark the rocker arm with a
pen after adjustment to keep track of what has
already been adjusted.

Torque tighten the lock nut on the rocker arm for
the unit injector to 39 Nm and the lock nut for
the valves to 35 Nm after adjusting.

Mark on flywheel
(degrees)

Valve change on
cylinder

Adjust injector
rocker arm on
cylinder

Adjust intake
valve on cylinder

Adjust exhaust
valve on cylinder

TDC Down (0°)

6

4 and 5

7 and 8

4 and 5

TDC Up (180()

7

2 and 6

1 and 5

2 and 6

TDC Down (360°) 1

3 and 7

2 and 4

3 and 7

TDC Up (540°)

4

1 and 8

3 and 6

1 and 8

Cylinder numeration

1

2

3

4

5

6

7

8

1

06

00

7

Cylinder head

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Текст

Политика конфиденциальности