1990 Ford Bronco 5.0L Thermactor Air Pump, Bypass Valve & Silencer Diagram

This document is a line-art schematic (illustration number A12775-A) showing the front view of an engine's secondary air injection (Thermactor) system components. An arrow at the upper left indicates the direction of the front of the engine. Three components are called out and highlighted in red: the silencer/filter (a cylindrical canister mounted at the front-left of the engine with a corrugated intake snorkel), the air bypass valve (a small cylindrical valve mounted low on the engine front), and the belt-driven air pump (shown with its pulley at the lower right). Colored hose routing has been added by the uploader: a green hose runs from the silencer/filter area up and over the engine, and a blue hose runs from near the silencer/filter down to the air pump inlet, with additional gray hoses shown connecting the air bypass valve and other fittings. The drawing also depicts surrounding engine hardware such as the valve cover, fuel pump area, alternator, and drive pulleys for spatial reference. A reader can learn where the silencer/filter, air bypass valve, and air pump are physically located on the front of the engine and how the associated air hoses are routed between them.