What is the torque spec for the air cleaner assembly nut?

The main air cleaner nut tightens to 8.0-12.4 N•m (70-110 in-lb); a second nut tightens to 2.9-3.9 N•m (25-35 in-lb).

What torque do the shroud and tube assembly nuts require?

The nut for the shroud and tube assembly tightens to 4.0-5.6 N•m (35-50 in-lb), the same spec as the screw and washer assembly for the tube assembly.

How should the air cleaner gasket be installed?

Per the diagram note: remove the release paper and pull-off tab before assembly, and install with the adhesive side down.

What parts make up the fresh-air/heat riser intake path shown?

The highlighted path includes the duct and valve assembly, a clamp, a tube, and the shroud and tube assembly mounted at the exhaust manifold, plus a flexible tube assembly running to the fender-area fresh air inlet.

What screw torque is specified for the duct and valve assembly area?

The screw shown near the duct and valve assembly tightens to 2.9-3.9 N•m (25-35 in-lb).

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Ford F-250 Air Cleaner Installation Diagram - Duct, Valve & Torque Specs

F-250 typical air cleaner installation diagram with torque specs for duct and tube assemblies

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F-250 air cleaner installation diagram showing duct/valve assembly, clamp, tube, and shroud with torque specs: nut 8.0-12.4 Nm (70-110 in-lb), screws 2.9-3.9 Nm, 4.0-5.6 Nm fasteners.

AI caption March 2008 · Photo 83 of 83

This document is a photographed page from a Ford factory service/reference manual, from a section titled "Section 3 — Engine Compartment and Drivetrain." It presents Figure 3-35, an exploded-view illustration captioned "Typical Air Cleaner Installation for F-250." The diagram identifies the components of the air cleaner and fresh-air intake system: the air cleaner assembly, elbow, grommet, gasket (with instructions to remove the release paper and pull-off tab before assembly, adhesive side down), duct and valve assembly, clamp, plug, vacuum source connection, tube, shroud and tube assembly, tube assembly (flexible fresh-air duct), and associated fasteners. Torque specifications are given for each fastener: the air cleaner nut tightens to 8.0-12.4 N•m (70-110 in-lb); a second nut and a screw tighten to 2.9-3.9 N•m (25-35 in-lb); the shroud/tube assembly nut and the screw-and-washer assembly tighten to 4.0-5.6 N•m (35-50 in-lb). An inset drawing shows the fresh air tube installed on the vehicle. The uploader has highlighted (in yellow marker) the duct and valve assembly, clamp, tube, and shroud and tube assembly — the fresh-air intake path down to the exhaust manifold heat shroud. A camera timestamp of 03/29/08 appears on the photo.

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Frequently asked questions

What is the torque spec for the air cleaner assembly nut?: The main air cleaner nut tightens to 8.0-12.4 N•m (70-110 in-lb); a second nut tightens to 2.9-3.9 N•m (25-35 in-lb).
What torque do the shroud and tube assembly nuts require?: The nut for the shroud and tube assembly tightens to 4.0-5.6 N•m (35-50 in-lb), the same spec as the screw and washer assembly for the tube assembly.
How should the air cleaner gasket be installed?: Per the diagram note: remove the release paper and pull-off tab before assembly, and install with the adhesive side down.
What parts make up the fresh-air/heat riser intake path shown?: The highlighted path includes the duct and valve assembly, a clamp, a tube, and the shroud and tube assembly mounted at the exhaust manifold, plus a flexible tube assembly running to the fender-area fresh air inlet.
What screw torque is specified for the duct and valve assembly area?: The screw shown near the duct and valve assembly tightens to 2.9-3.9 N•m (25-35 in-lb).