
162 LIGHT AND HEAVY VEHICLE TECHNOLOGY
Supply
Supply
D
m
Axial
plunger C_^)
|B^§*I
Radial -,
plungers C )
Figure 8.26 Maximum and idling speed controls for
pneumatic governor (Lucas CAV): T adjustable screw for
maximum speed; U adjustable screw for idling
(Figure 8.25). Less commonly, it may act against a
rocking lever mounted just ahead of the depression
chamber, the other end of the lever having access to the
fuel control rack or rod.
Idling speed stop screw
This is also located from a lug on the body of the
venturi unit but acts, of course, in the opposite sense to
the maximum speed stop screw against the butterfly
valve operating lever