Scania 16 litre engine. Work Description - part 10

 

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Scania 16 litre engine. Work Description - part 10

 

 

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37

Checking and machining

Specifications

Intake valve

Head angle

19.5°

Minimum dimension A for ground valve

2.6 mm

Exhaust valve

Head angle

44.5°

Minimum dimension A for ground valve

1.8 mm

Minimum dimension A for ground valve

Check dimension A on all valves.

Grind the valves in a valve grinding machine.

Cylinder head

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Valve stem seal

Renewal

Special tools

1

Dismantle the cylinder head as described in 
dismantling.

2

Remove the valve stem seal with a pair of 
pliers.

3

Fit the valve.

Number

Designation

Illustration

Tool board

99 323

Drift

D 5

01_1348

4

Tap in a new valve stem seal carefully using 
tool 99 323 and a hammer.

01_1349

99 323

Cylinder head

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39

Valve seats

Renewal

Special tools

1

Remove the valve seat inserts. Use a 
discarded valve that has been ground so that 
the diameter of the disc is slightly smaller 
than the inside diameter of the seat.

Number

Designation

Illustration

Tool board

99 384

Drift

D1-A3

99 385

Shank

D1-B1

99 384

110 966

99 385

11

0

 96

7

Valve welded in place

2

Fit the valve and weld around it with an 
electric welder. Cool with water. Turn over 
the cylinder head and knock the valve stem 
so that the valve and seat insert fall out.

!

WARNING!

Wear protective goggles. Always turn the 
cylinder head with the underside face 
down while knocking out the valve seat 
insert. Otherwise, there is a risk that 
loose shivers of metal can cause 
personal injury.

Cylinder head

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3

Press in new valve seat inserts. Use drift 
99 384 and shaft 99 385. Cool the drift and 
valve seat to approximately –80

°

C in carbon 

acid ice or with liquid oxygen. Pressing 
must be carried out rapidly.

!

WARNING!

Be careful when handling the cold parts 
and the cooling agents named above. 
Risk for frost injuries.

Oversize valve seat inserts can be fitted if the 
valve seat insert position has been damaged. The 
position must then be machined using tool 
587 277.

Cylinder head

 

 

 

 

 

 

 

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