Scania 16 litre engine. Work Description — part 11

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Machining the cylinder head

Specifications

Cylinder head

Distance B between the cylinder head face and the valve disc:

- Intake, min. dim.

0.75 mm

- Exhaust, min. dim.

0.66 mm

- Intake, max. dim.

1.8 mm

- Exhaust, max. dim.

1.8 mm

Intake valve seat

Seat angle

20.0°-20.5°

Width of contact surface A

1.9 - 2.6 mm

Valve seat insert, outer diameter

46.054 - 46.065 mm

Valve seat insert position, diameter

46.000 - 46.016 mm

Valve seat insert position, depth

11.25 - 11.35 mm

Valve seat ring, oversize

Outside diameter

46.254 - 46.265

Valve seat insert position, diameter

46.200 - 46.216

Cooling temperature when fitting valve seat insert.

approximately -80

°

C

Exhaust valve seat

Seat angle

45.0°-45.5°

Width of contact surface A

1.8 - 2.6 mm

Valve seat insert, outer diameter

44.081 - 44.092 mm

Valve seat insert position, diameter

44.000 - 44.016 mm

Valve seat insert position, depth

11.25 - 11.35 mm

Valve seat ring, oversize

Outside diameter

44.281 - 44.292

Valve seat insert position, diameter

44.200 - 44.216

Cooling temperature when cooling valve seat insert.

approximately -80

°

C

Cylinder head

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Cylinder head

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Tools

Two equally good alternatives for cutters are
specified above.

Number

Designation

Illustration

587 277

Valve seat cutter

-

587 061

Valve seat cutter

106 794

Valve seat insert, machining
measurement

Intake valve

A = 1.9 - 2.6 mm

B = 0.75 - 1.8 mm

C = diameter, 39.8+/-0.5 mm (setting dimension
for machining tool)

C

112 266

Exhaust valve

A = 1.8 - 2.6 mm

B = 0.66 - 1.8 mm

C = diameter, 37.9+/-0.5 mm (setting dimension
for machining tool)

C

112 267

Cylinder head

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Machining measurement and oversize valve seat
inserts, refer to Specifications.

1

Make sure the contact surface and magnetic
stand are level and clean. Clean the valve
guides.

2

Select the largest spindle that moves easily
in the valve guide. Insert the guide spindle
and turn the feed screw to its uppermost
position.

3

Select the cutter and fit it.

4

Release the quick-action lock and move the
pivot plate to the upper position with the
adjusting screw.

Cylinder head

The following description applies to valve seat
cutter 587 277.