Group 25 Intake and Exhaust System Design and Function
Air Restriction Indicator
There are several types of restriction indicators which
can be mounted in certain locations, such as on the air
cleaner duct or on/above the instrument panel. The air
restriction indicator mounted on the instrument panel
permits continuous monitoring of the gauge.
When either the flag or piston-type restriction gauge is
mounted directly on the air cleaner, the piston is usually
drawn downward into view as the element loads with dirt.
It locks into full view only after the restriction (caused by
a dirty element) reaches the rated value of the indicator.
W2000740
Fig. 24: Air restriction indicator WX, WG , AC(dash
mounted)
W2003505
Fig. 25: Air restriction indicator VN, VHD, VNM (located
beneath the air box)
W2003506
Fig. 26: Air restriction indicator VN, VHD (located on the
air pipe)
W2000741
Fig. 27: Piston-type air restriction indicator-WG
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