TM 9-8000 Principles of Automotive Vehicles
U.S. Department of the Army (mirror: liberatedmanuals.com)
38 illustrated chapters on how vehicles work and are repaired: gasoline/diesel engines, fuel, cooling, electrical/batteries/charging/starting/ignition, brakes, drivetrains — the best legally redistributable general auto-repair text (Chilton/Haynes are not redistributable).
Editor's notes
1985/1988 (Change 1) — pre-OBD-II; no coverage of modern engine electronics, hybrids, or EVs. Fundamentals (batteries, brakes, cooling, mechanical systems) are still accurate. Mirror is unofficial; the PDF itself carries the public-release distribution statement — verify it in the file before bundling.
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Source & license
US federal government work (public domain); approved for public release, distribution unlimited.
Use of this material does not imply endorsement by its publisher or any government agency.