Marquis L4-140 2.3L VIN A 1-bbl (1986)
Air Injection Pump: Description and Operation
Passenger Cars and Light Trucks
The Air Supply Pump is a belt driven, positive displacement, vane type pump that provides air for the thermactor system. it is available in 11-cubic inch
and 19-cubic inch sizes, either of which may be driven with different pulley ratios for different applications. The 11-cubic inch pump (Figure 1) receives
its air through a remote filter attached to the air inlet nipple or through an impeller type centrifugal air filter fan. The 19-cubic inch pump (Figure 2) uses
an impeller type centrifugal air filter fan which separate dirt, dust, and other contaminants from the Intake air by centrifugal force. The air supply pump
does not have a pressure relief valve, a function performed by the bypass valve.
Heavy Duty Trucks
The Air Supply Pump is a belt driven, positive displacement, vane type pump that provides air for the thermactor system It is available in 19-cubic inch
and 23-cubic inch sizes, either of which may be driven with different pulley ratios for different applications. Both pumps (Figure 3), receive air from a
remote silencer filter attached to the pumps' air inlet nipple. The pressure relief function is performed by the bypass valve.
