Cylinder Head Assemble

Special Tools

• EN-958:  Installer for 5 mm (0.2 in) Valve Stem Sealings
• EN-6086:  Basic Kit, Spring and Wedge Replacer
• EN-6167:  Counter Holder
• EN-6215-3:  Locking Pins

For equivalent regional tools, refer to Special Tools .

Fig 1: Counter Holder Type A
Courtesy of GENERAL MOTORS CORP.
NOTE: Condition: All construction units are cleaned and checked. The cylinder head is installed on the assembly fixture and stands on the head.
NOTE: Depending upon the combustion chamber organization, different holders must be used to protect the valves.
1. Counter holder type A (1).
Fig 2: Counter Holder Type B
Courtesy of GENERAL MOTORS CORP.
2. Counter holder type B (1).
3. Coat all valve guides and valves with oil and install them in the cylinder head in sequence. Install the counter holder. For different combustion chambers you have to use the correct counter holder to safe the valves.
Fig 3: Counter Holder, Locking Pins And Holding Screws
Courtesy of GENERAL MOTORS CORP.
4. Install the counter holder EN-6167-1:  holder (1). Fasten the EN-6215-3:  locking pins (3) with safety lock pins. Fasten the holding screws (2). Turn the cylinder head baseplate again.
Fig 4: Valve Stem Sealings
Courtesy of GENERAL MOTORS CORP.
5. Install the valve stem sealings (1) with the appropriate tools (2) carefully.

   For 5 mm (0.2 in) use the EN-958:  installer.

NOTE: It is necessary that the components of the assembly head are built together in correct sequence.
6. Attach the valve springs and valve retainers into the cylinder head in sequence.

   The respective sizes are hit on the head of the thrust pieces.

Fig 5: Pushing Fixing Case
Courtesy of GENERAL MOTORS CORP.
NOTE: The combinations of admission and thrust piece are to be kept compellingly, since otherwise the valve wedges can not be installed or the thrust pieces will damaged.
The combinations of admission and thrust piece are to be inferred from the overview.
7. Push the fixing case (1) downward and install the valve wedges in the assembly head. Now push the fixing case upward, through this procedure the valve wedges are fixed.

   Attach assembly head to lever EN-6086:  lever.

Fig 6: Touching Down Assembly Head
Courtesy of GENERAL MOTORS CORP.
NOTE: To facilitate the assembly of the valve shim, the assembly head is to touch down (1) with the thrust piece on the valve stem. This avoids damage of the thrust pieces.
8. Adjust (align) the lever tool until the assembly head is positioned perpendicularly over the valve.

   Press the assembly head with the lever tool carefully and slowly with little pressure until the valve wedges engage audibly into the valve stem.

Fig 7: Lever Tool
Courtesy of GENERAL MOTORS CORP.
9. Remove the lever tool (1) and lateral took up.
Fig 8: Counter Holder Side Mounts
Courtesy of GENERAL MOTORS CORP.
NOTE: After the assembly of all attachments the cylinder head is to be cleaned thoroughly.
10. Remove the counter holder (1).

    Detach the cylinder head from the assembly fixture.