Removal/Air Filter Element Replacement - Ford VSG-411 Service Manual

3-02
Fuel System
sensor unit will be closed allowing full manifold vacuum to be
available at the diaphragm unit.
AS the temperature increases above a pre-determined
value the
ball valve opens allowing air to bleed through the unit into the
vacuum line. This reduces the effect of manifold vacuum at the
vacuum diaphragm.
The combined effect of the heat sensor, vacuum diaphragm
unit, and duct valve is to control the blend of hot and cold air under
closed or part throttle conditions thereby maintaining a constant
air intake temperature. However, when the ambient temperature is
below the sensor operating temperature it will provide colder air at
or near full throttle to achieve good performance.
FIG. 2 Heat Sensor and Diaphragm/Duct Valve Operation
1 - Sensor Cold 2 - Sensor Hot
A -
Open to Atmosphere
8 - Manifold Vacuum
C - Vacuum Reduced by Air Bled Through Ball Valve
REMOVAL AND INSTALLATION
REMOVAL/AIR FILTER ELEMENT REPLACEMENT
1. Remove two screws retaining air cleaner to carburetor.
2. Raise air cleaner and disconnect crankcase ventilation hose
from air cleaner and vacuum hose from intake manifold.
Remove air cleaner.
3. Remove air cleaner cover. Use caution not to crack cover.
4. Remove element.
Inspection
Visually inspect the element and the air cleaner cover and body
for signs of dust or dirt leaking through holes in the filter media or
past the end seals. Place a light on the inside (clean side) of the
filter and look through the filter at the light. Any hole in the
element, even the smallest, is cause for replacement.
Installation
1. Wipe all inside surfaces of the air cleaner body and cover.
Install the air filter element.
2. Install air cleaner cover to body.
3. Connect the vacuum hose to intake manifold and crankcase
ventilation hose to air cleaner.
4. Position the assembly onto the carburetor and connect heat
riser tube from exhaust manifold shroud to air cleaner duct.
5. Install and tighten two retaining screws.