Machine valve seat rings

AR05.30-B-4511E

Machine valve seat rings

12.02.16



Measuring

1

Measure the distance between the face of the valves and the cylinder head mating surface (valve recess)

Should the obtained measurement not be within the recommended values:

- replace the intake valve (1) and/or rework or replace the seat insert (4);

- replace or rework the exhaust valve (2) and/or the seat insert (4);

AR05.30-B-4100-01D

*BE05.30-B-1001-01D



*001589532100



*343589004000



Disassembling

2

Remove the valve (1, 2) from the cylinder head (3)

Mark the valve.

AR05.30-B-3511E



Check

3

Check the valve guide for wear, replace if necessary

AR05.30-B-3731D

Valve guide inside diameter.

*BE05.30-B-1003-02B

4

Check the valve (1, 2) for dimensions and condition

Replace the valves when presenting wear in the valve keeper grooves, damage at the end and in the stem chromium layer and burnt seat.

AR05.30-B-4202-01A

Do not reface the intake valve.In case of damages/wear, replace it.

If necessary, rework or replace the exhaust valve.

AR05.30-B-4202C

5

Check the valve seat insert (4)

In the case of slight deformation on the seat surface, it is possible to rework the seat, provided the distance from the valve to the cylinder head (valve recess), after machining, is within the recommended values.

If necessary, replace the seat insert.

AR05.30-B-3831D

Machining

6

Machining the valve seat (4)

The number of times the seat insert can be reworked is limited by the distance from the valve to cylinder head (valve recess). In the case of a new seat insert, whenever possible, maintain the valve recess in the minimum tolerance value.

If the following recommended values, are not obtained after machining, replace the seat insert.

AR05.30-B-3831D

Valve seat angle (E)

*BE05.30-B-1011-03D

Diameter (G) in the position (H), intake.

*BE05.30-B-1012-03D

Diameter (G) in the position (H), exhaust.

*BE05.30-B-1013-03D

Max. out-of-round on the seat face.

*BE05.30-B-1008-03D

7

Check the contact of the seat insert face with the valve

There must be a uniform contact in the whole seating area of the seat insert.

AR05.30-B-4532-02A



Assembling

8

Install the valve (1, 2)

AR05.30-B-3511E

Número

Denominação

Engine 457.9; 460.984

BE05.30-B-1001-01D

Distance between the valves faces and the head

Intake

Normal

mm

0.7...1.1

Maximum repair

mm

1.6

Exhaust

Normal

mm

0.7...1.1

Maximum repair

mm

1.6

Número

Denominação

Engine 457.9; 460.984

BE05.30-B-1003-02B

Valve guide internal diameter (final finishing)

Normal

mm

9.000...9.022

wear limit

mm

9.050

Número

Denominação

Engine 457.9,

BE05.30-B-1008-03D

Maximum allowed end play(eccentricity) in the case seat face, in relation to the valve guide

Intake

mm

0.04

Exhaust

mm

0.04

BE05.30-B-1011-03D

Angle (E) of the seating face in the valve case

Intake

degrees

30

Exhaust

degrees

45

BE05.30-B-1012-03D

Control diameter (G) in the relative position (H) of the intake case

Diameter G

mm

41.99...42.01

position (H)

mm

3.80...3.95

BE05.30-B-1013-03D

Control diameter (G) in the relative position (H) of the exhaust case

Diameter G

mm

38.99...39.01

position (H)

mm

4.00...4.15