300SDL (126.125) L6-3.0L DSL Turbo (603.961) (1987)
19. Insert assembly cartridge (9) with valve collets inside into the guide bush (11), attach thrust fork (6) to mating bearing (18) and position with slight
pressure onto the two mounting bolts of the assembly cartridge (9).
20. Press down thrust fork (6) (arrow). Pull the knurled screw of the assembly cartridge (9) up (arrow), this releases the pressure on the thrust fork (the
valve collets are thus installed).
21. Check whether the valve collets (9) are correctly inserted; repeat steps 2 to 8 and 17 to 19, if necessary.
22. Detach all the special tools from the cylinder head.