ar0530b4201a

Inspect, machine valves

Type ar · topic 05.30 · version 0100 · 2016-02-12

Applies to: Cumbustion engine 612 with Vehicle 979.013, 979.016

Where it sits

Function group 1 Engine › 05 Engine timing › 05.30 Valves — Series 979 (models 013, 016)

EinPAS 15 Engine › 15.17 Engine timing › 15.17.30 Valve train — Series 979 (models 013, 016)

Also applies to engines/gearboxes: 612 ***

AR05.30-B-4201A

Inspect, machine valves

12.02.16

Cumbustion engine 612 with Vehicle 979.013, 979.016

Inspect, machine valves

B05.30-0043-06

1 Valve

2 Valve grinder

A Valve seat face angle

B Valve head diameter

C Valve length

E Valve stem diameter

G Control diameter against the position (H)

H Position relative to the diameter (G)

Remove

1

Remove the valves.

AR05.30-B-3511H

Check

2

Clean the valve (1) and check the status.

Replace the valve whose seat shows burns, scratches and excessive wear on the stem.

*BE05.30-B-1005-01G

Grind

3

Properly fasten the valve (1) to the grinder (2).

Keep the valve head as close as possible to the chuck so as to prevent oscillation/vibration.

Use a proper valve grinder

4

Adjust the angle to the valve seat face using the scale of the grinder (2).

Seat face angle (A) on the valve.

*BE05.30-B-1002-01G

Use a proper valve grinder

5

Through the grinder feed (2), slowly bring the valve seat face (1) closer to the grinding wheel.

6

Grind at a slow feed speed until the valve seat face (1) is perfectly clean and without deformation all over the circumference.

After rework, the control values should match the prescribed values:

Valve head diameter (B).

*BE05.30-B-1003-01G

Diameter (G) at position (H), inlet.

*BE05.30-B-1006-01G

Diameter (G) at position (H), exhaust.

*BE05.30-B-1007-01G

7

Check the valve seat concentrically relative to the stem.

Max. knocking at the seat face.

*BE05.30-B-1008-01G

8

If necessary, grind the stem end top (face in contact with the tappet), with the valve (1) on the prismatic support of the grinder (2).

The length of the valve (C) must remain within the specified limits.

*BE05.30-B-1004-01G

Use a proper valve grinder

Install

9

Mount the valves.

AR05.30-B-3511H

Check values for valves

Número

Denominação

Engine 611.981/983, 612.983

BE05.30-B-1002-01G

Valve seat angle on valve

intake

degrees

45

exhaust

degrees

45

BE05.30-B-1003-01G

Valve head diameter

intake

mm

30,1...30,3

exhaust

mm

28,3...28,5

BE05.30-B-1004-01G

Valve length

intake

mm

103,8...104,2

exhaust

mm

104,2...104,6

BE05.30-B-1005-01G

Valve stem diameter

intake

mm

6,960...6,975

exhaust

mm

6,955...6,970

BE05.30-B-1006-01G

Control diameter in relative position of intake valve

G diameter

mm

29,2

H position (new)

mm

1,7...1,9

BE05.30-B-1007-01G

Control diameter in relative position of exhaust valve

G diameter

mm

27,4

H position (new)

mm

1,8 ... 2,0

BE05.30-B-1008-01G

Maximum permissible eccentricity of valve seat face, in relation to the stem

intake

mm

0,03

exhaust

mm

0,03

Referenced documents