Replace valve seat rings

AR05.30-G-3831MT

Replace valve seat rings

10.1.07

6.11.06

Inside Ø (B)

Engine 447.903

*BE05.30-N-1001-02O

 Danger!

Risk of injury caused by handling liquid nitrogen or by touching undercooled objects. Risk of suffocation from inhaling nitrogen gas.

Wear heat protective gloves, protective clothing and full eye protection.
Ensure that the work area is adequately ventilated.

AS00.00-Z-0003-01A

1

Remove valves

AR05.30-G-3511MT

2

Check valve guides (5) for wear

 Visual inspection:

The valve guides (5) must not have any surface damage.

3

Check inside diameter of valve guide (5) using a plug gage

 It must not be possible to insert the side of the plug gauge marked with '+' into the valve guide (5).

Replace valve guide (5) if necessary:



Checking / removing / installing valve guides

AR05.30-G-3731MT

*BE05.30-N-1001-02O



*100589102100

4

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

AR05.30-G-3831-01MT



*000589293300



*000589303300



*000589343300



*366589006900

5

Measure and record bore diameter (B) in cylinder head (3)

 Insert dial indicator into quick caliper for internal measurements for this step and set to the necessary diameter using the micrometer.

*BE05.30-N-1005-03M



*001589532100

6

Determine overlap between noted bore Ø (B) in cylinder head (3) and the outside Ø (A) for new valve seat rings (1, 2)

 The overlap between the recorded bore Ø (B) in cylinder head (3) and the outside Ø (A) for new valve seat rings (1, 2) must be achieved.
If measurements obtained deviate from specified Check values:



*BE05.30-N-1003-03M

Reworking the valve seat ring basic bore

AR05.30-G-3831-02MT

*BE05.30-N-1001-03M

*BE05.30-N-1002-03M

*BE05.30-N-1003-03M

*BE05.30-N-1004-03M

*BE05.30-N-1005-03M

*BE05.30-N-1006-03M



*001589532100



*366589006900

7

Place valve seat rings (1, 2) in supercooling box and pour in liquid nitrogen.



 Supercool valve seat rings (1, 2) for about 20 to 30 minutes.

 Avoid contact with liquid nitrogen or with supercooled valve seat rings
(1, 2).



*346589006300

8

Heat cylinder head (3) to approx. 80 °C

 In water bath

9

Use pliers to remove valve seat rings (1, 2) from supercooling box and fit onto the bores of the heated cylinder head (3)



Do not bring into contact with liquid nitrogen or supercooled valve seat ring (1, 2) to avoid injury to the skin

10

Press in valve seat ring (1) or valve seat ring (2)

 The valve seat rings (1, 2) must be pressed in without delay otherwise the cylinder head (3) or valve seat rings (1, 2) can be damaged.

 Mount specified sleeve for press on valve seat ring (1, 2) and introduce drift into the sleeve. Drive in valve seat ring (1) or valve seat ring (2) using the plastic mallet.

*BE05.30-N-1004-03M



*403589001500



*403589011500

11

Machine the valve seat rings (1, 2)

 The valve seat rings (1, 2) must always be machined.

AR05.30-G-4532-01MT

*BE05.30-N-1007-03M

*BE05.30-N-1008-03M



*366589006900

12

Grinding the valves

 Only perform if no new valves have been used.

When installing new valve seat rings (1, 2) the old valves must always be ground.

AR05.30-G-4202MT

13

Install valves

AR05.30-G-3511MT

Number

Designation

Engine
444.901,
447.903

BE05.30-N-1001-02O

Valve guide

Outer Ø (A)

Standard

mm

18.028 to 18.046

Deviation 0.2

mm

18.235 to 18.256

Deviation 0.4

mm

18.435 to 18.456

Bore Ø in cylinder head (A1)

Standard

mm

18.000 to 18.018

Deviation 0.2

mm

18.200 to 18.221

Deviation 0.4

mm

18.400 to 18.421

Inside Ø (B)

Pressed in

mm

12.000 to 12.027

Length (C)

mm

67,0

Distance (D) top edge

Inlet

mm

17.1 to 17.5

Valve guide to contact surface of valve spring

Outlet

mm

17.1 to 17.5

See picture

AR05.30-G-3731MT

Number

Designation

Engine
444.901,
447.903

BE05.30-N-1001-03M

Valve seat ring of inlet valve

Outside Ø "A"

Standard

mm

60.10 to 60.11

Deviation 0.2

mm

60.30 to 60.31

Deviation 0.4

mm

60.50 to 60.51

Height "D"

Standard

mm

8.3 to 8.4

Deviation 0.2

mm

8.5 to 8.6

Deviation 0.4

mm

8.7 to 8.8

See picture

AR05.30-G-3831MT

BE05.30-N-1002-03M

Valve seat ring of exhaust valve

Outside Ø "A"

Standard

mm

53.10 to 53.11

Deviation 0.2

mm

53.30 to 53.31

Deviation 0.4

mm

53.50 to 53.51

Height "D"

Standard

mm

9.1 to 9.2

Deviation 0.2

mm

9.3 to 9.4

Deviation 0.4

mm

9.5 to 9.6

See picture

AR05.30-G-3831MT

BE05.30-N-1003-03M

Overlap of valve seat ring in cylinder head

Inlet

mm

0.07 to 0.11

Outlet

mm

0.07 to 0.11

BE05.30-N-1004-03M

Distance "E" between cylinder head separating surface and end face of valve seat ring

Inlet

mm

4.1 to 4.3

Outlet

mm

3.3 to 3.5

BE05.30-N-1005-03M

Bore Ø "B" of valve seat rings in cylinder head

Intake valve bore

Standard

mm

60.00 to 60.03

Deviation 0.2

mm

60.20 to 60.23

Deviation 0.4

mm

60.40 to 60.43

Hole in exhaust valve

Standard

mm

53.00 to 53.03

Deviation 0.2

mm

53.20 to 53.23

Deviation 0.4

mm

53.40 to 53.43

See picture

AR05.30-G-3831MT

BE05.30-N-1006-03M

Bore depth "C" for valve seat rings in cylinder head

Standard

mm

12.5 to 12.6

Deviation 0.2

mm

12.7 to 12.8

Deviation 0.4

mm

12.9 to 13.0

See picture

AR05.30-G-3831MT

BE05.30-N-1007-03M

Valve seat

Valve seat angle at valve seat (J)

Intake

°

30

Outlet

°

45

Valve seat width at valve seat (F)

Intake

mm

1.8 to 3.0

Outlet

mm

1.4 to 2.6

See picture

AR05.30-G-4511MT

BE05.30-N-1008-03M

Valve seat Ø at valve seat ring (finish-machined), machining dimension (G) relative to depth (H) of cylinder head contact surface.

Inlet

Dimension (G)

mm

54.99 to 55.01

Dimension (H)

mm

3.90 to 4.10

Outlet

Dimension (G)

mm

47.99 to 48.01

Dimension (H)

mm

3.10 to 3.30

See picture

mm

AR05.30-G-4511MT