6.
Fasten screws crosswise to a torque according to table.
Table 1:
Tightening torques for screws
Tightening torque T
A
[Nm]
Screws
Strength class 8.8
Threads
25
M8
51
M10
87
M12
214
M16
431
M20
4.3.2
Output drive type A
Application
●
Output drive for rising, non-rotating valve stem
●
Capable of withstanding thrust
4.3.2.1
Stem nut: finish machining
✔
This working step is only required if stem nut is supplied unbored or with pilot
bore.
Figure 8:
Design of output drive type A
[1]
Stem nut
[2]
Bearing
[2.1] Bearing race
[2.2] Bearing rim
[3]
Spigot ring
1.
Remove spigot ring [3] from output drive.
2.
Remove stem nut [1] together with bearings [2].
3.
Remove bearing races [2.1] and bearing rims [2.2] from stem nut [1].
4.
Drill and bore stem nut [1] and cut thread.
Information: When fixing in the chuck, make sure stem nut runs true!
5.
Clean the machined stem nut [1].
6.
Apply sufficient Lithium soap EP multi-purpose grease to bearing rims [2.2] and
bearing races [2.1], ensuring that all hollow spaces are filled with grease.
7.
Place greased bearing rims [2.2] and bearing races [2.1] onto stem nut [1].
8.
Re-insert stem nut [1] with bearings [2] into output drive.
Information: Ensure that dogs or splines are placed correctly in the keyway of
the hollow shaft.
9.
Screw in spigot ring [3] until it is firm against the shoulder.
13
SAExC 07.1 – SAExC 16.1/SARExC 07.1 – SARExC 16.1
AMExB 01.1
Assembly
