Scania 16 litre engine. Work Description - part 5

 

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Scania 16 litre engine. Work Description - part 5

 

 

0101w14b.mkr

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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

0101w14b.mkr

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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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