What components are shown in this Thermactor/secondary air diagram?

The diagram labels the valve assembly, check valves, connecting hose, air bypass valve, and air pump, shown both installed on the engine and in an exploded hose-routing view.

Where is the air bypass valve located relative to the air pump?

In both views the air bypass valve mounts directly to the air pump, which sits at the lower front of the engine, driven by a pulley.

How many check valves does this system use?

The diagram labels two check valves — the left view points to "CHECK VALVES" (plural) and the right exploded view shows two separately labeled check valves.

How is the diagram oriented?

Both illustrations include "FRONT OF ENGINE" labels with arrows indicating the viewing orientation.

Is there a Ford illustration reference number on this diagram?

Yes, the reference number A7746-E appears at the bottom right of the diagram.

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Ford 5.0L Thermactor Air Pump & Check Valve Hose Routing Diagram (A7746-E)

Engine diagram showing check valves, valve assembly, air bypass valve and air pump

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Secondary air schematic showing check valves, valve assembly, air bypass valve and air pump routing at the front of the engine.

AI caption July 2013 · Photo 1565 of 1799

This document is a two-part line-art schematic of the Thermactor secondary air injection (smog pump) system on a Ford V8 engine, uploaded as "1990 Mustang 5.0L Emissions.jpg" to a 1990 Ford Bronco gallery. The left illustration shows the components installed on the engine as viewed from the front: the valve assembly mounted near the intake/upper engine, two check valves, the connecting hose routed down the front of the engine, the air bypass valve, and the belt-driven air pump at the lower front of the engine. The right illustration is an exploded/hose-routing view of the same system, showing two check valves and the valve assembly connected by rigid air tubes and hoses, leading through a large hose to the air bypass valve, which mounts to the air pump. Arrows in both views indicate "FRONT OF ENGINE" for orientation. The Ford illustration reference number A7746-E appears at the lower right. The diagram contains no fuse data, wire colors, torque values, or year/model text; its value is in showing the physical arrangement, hose routing, and relative locations of the secondary air (Thermactor) components for identification, replacement, or reassembly.

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Frequently asked questions

What components are shown in this Thermactor/secondary air diagram?: The diagram labels the valve assembly, check valves, connecting hose, air bypass valve, and air pump, shown both installed on the engine and in an exploded hose-routing view.
Where is the air bypass valve located relative to the air pump?: In both views the air bypass valve mounts directly to the air pump, which sits at the lower front of the engine, driven by a pulley.
How many check valves does this system use?: The diagram labels two check valves — the left view points to "CHECK VALVES" (plural) and the right exploded view shows two separately labeled check valves.
How is the diagram oriented?: Both illustrations include "FRONT OF ENGINE" labels with arrows indicating the viewing orientation.
Is there a Ford illustration reference number on this diagram?: Yes, the reference number A7746-E appears at the bottom right of the diagram.