Remove/install valves

AR05.30-P-3511TI

Remove/install valves

16.08.2019

Engine

642 in model 211

Modification notes

09.08.2019

Information document AH05.30-P-1000-02SZ, added.

Check operation step group before operation step 12.

1

Cylinder head

03

Assembly lever

05

Sliding piece

01

Assembly device

04

Thrust piece

06

Lever

02

Counterholder

2

Upper valve spring retainer

04

Thrust piece

6

Valve

3

Valve spring

5

Lower valve spring retainer

07

Tweezers

4

Valve keeper

 

Remove/install

1

Remove cylinder head (1).

AR01.30-P-5800TI

2

Unscrew exhaust manifold.

AR14.10-P-3915TI

3

Attach cylinder head (1) to assembly device (01).


Before commissioning the assembly device (01), check that the counterholders (02) are correctly attached to the cylinder head (1).
There is otherwise the danger that the cylinder head (1) will be pressed upwards out of the assembly device (01) and the cylinder head (1) will be damaged with the valves (6) in the combustion chamber.

 Observe operator's manual of assembly device manufacturer (01).

 Assembly tool

*271589005900

4

Attach the assembly lever (03) to the sliding piece (05) with thrust piece (04).

 Position thrust piece (04) vertically on the upper valve spring retainer (2) and align sliding piece (05).

 Depressor

*640589006100

 Valve assembly tools kit

*111589256100

5

Move air bellows of the assembly device (01) with the lever (06).


Ensure that the air bellows of the assembly device (01) always correctly match the combustion chamber and are pushed into the center.
Because the air bellows will otherwise be pressed out of the side of the combustion chamber and this causes damage to the valves (6).

 Move the air bellows of the assembly device (01) with the lever (06) so that the air bellows match the combustion chamber of the respective valves (6).

 Observe operator's manual of assembly device manufacturer (01).

6

Connect compressed air to assembly device(01) and open compressed air valve.

 The assembly device (01) air bellows presses the valve disks in the combustion chamber.

 Observe operator's manual of assembly device manufacturer (01).

7

Remove top valve spring retainer (2) and valve spring (3).

 Press valve spring (3) together. Remove valve keeper (4) with tweezers (07).

8

Replace valve stem seal.

Before installing the upper valve spring retainer (2) and valve spring (3).

AR05.30-P-3500-02TI

 Drift

*604589004300

 Pliers

*606589003700

9

Remove lower valve spring retainers (5).

10

Close compressed air valve of the assembly device (01).

 Then close off the compressed air to the assembly device (01).

11

Remove the valves(6).

 To do this, remove cylinder head (1) from the assembly device (01).



Check

General information on checking valves, valve seats and valve guides

AH05.30-P-1000-02SZ

12

Check upper valve spring retainers (2) and lower valve spring retainers (5).

 Installation: Check upper and lower valve spring retainers (2, 5) for score marks, cracks and pitting; replace if necessary.

13

Check valve stems.

 Check surface of valve stems for roughness and ridging (visual inspection or with nail).

 Installation: Replace valves (6) with a rough stem surface or formation of burrs.

14

Install in the reverse order.