Machine valve seat rings

AR05.30-B-4511B

Machine valve seat rings

12.02.16



Measuring

1

Measure the distance (K) i valve recess.

Should the obtained value not be within the recommended values, rework or replace the valve (2 and 3), or the seat insert (6).

AR05.30-B-4100-01B

*BE05.30-B-1010-03B



*001589532100



*343589004000



Disassemble

2

Remove the valve (2 and 3) from the cylinder head (1).

AR05.30-B-3511B



Check

3

Check the valve guide for wear, replace if necessary.

AR05.30-B-3731A

Valve guide inside diameter.

*BE05.30-B-1003-02C

4

Check the valve (2 and 3) for conditions and dimensions.

Replace the valves when presenting wear on keeper grooves, damages on the stem face and on the stem's chromium layer and burnt seat.

AR05.30-B-4202-01B



*001589532100

If necessary, rework the valve.

AR05.30-B-4202A

5

Check the valve seat (6).

In the case of slight seat surface deformation, it is possible to rework the seat, provided the valve recess, after reworking, is greater or equal to the minimum permissible.

If necessary, replace the seat insert.

AR05.30-B-3831B

Machining

6

Machine the valve seat (4).

The number of times the valve seat can resurfaced is limited by the valve distance (K) - valve recess. When machining the angle (C), control the distance (K) - valve recess, inserting the valve to be assembled. Whenever possible, machine the angle (C) maintaining the distance (K) at the smaller limit, enabling a new machining when needed.

If the values recommended next, are not attained with the machining, replace the seat insert.

AR05.30-B-3831B

Angle of the seat face (C) - Intake.

*BE05.30-B-1006-03B

Angle of the seat face (C) - Exhaust.

*BE05.30-B-1007-03B

Diameter (D) - Intake.

*BE05.30-B-1011-03B

Diameter (D) - Exhaust.

*BE05.30-B-1012-03B

Control measurement (E) - Intake.

*BE05.30-B-1008-03B

Control measurement (E) - Exhaust.

*BE05.30-B-1009-03B

Distance (K).

*BE05.30-B-1010-03B

Interference between the seat insert and the housing in the cylinder head.

*BE05.30-B-1014-03B

Maximum permissible eccentricity of the seat insert in relation to the valve guide.

*BE05.30-B-1013-03B

7

Check the contact of the valve seat face.

There must be a uniform contact on the entire seat area.

AR05.30-B-4532-02B



Assembling

8

Install the valve (2 and 3).

AR05.30-B-3511B

Número

Denominação

Engine 475.9; 476.9

BE05.30-B-1006-03B

Angle (C) of the intake valve case

degrees

30°

BE05.30-B-1007-03B

Angle (C) of the exhaust valve case

degrees

45°

BE05.30-B-1008-03B

Intake case, control measurement (E): position related to the diameter (D)

Normal

mm

4.50...4.65

Maximum limit

mm

4.85

BE05.30-B-1009-03B

Exhaust case, control measurement (E): position related to the diameter (D)

Normal

mm

3.90...4.05

Maximum limit

mm

4.25

BE05.30-B-1010-03B

Distance between the valve face (intake and exhaust) and the head loser face

mm

0.7...1.1

BE05.30-B-1011-03B

Control diameter in the seat face (D) in relation to the position (E), intake case

mm

54.9...55.1

BE05.30-B-1012-03B

Control diameter in the seat face (D) in relation to the position (E), exhaust case

mm

47.9...48.1

BE05.30-B-1013-03B

Maximum allowed eccentricity of the cases in relation to the valves guides

mm

0.04

BE05.30-B-1014-03B

Interference between the case (exhaust and intake ) and the housing in the head

mm

0.07...0.11

Número

Denominação

Engine 475.9; 476.9

BE05.30-B-1003-02C

Valve guide inside diameter - D (final finish)

mm

12,000...12,018

Wear limit (measured at valve guide middle).

mm

12,050