Description

BMW 318, 323, 325, 321, 326 Workshop Manual

You tighten a head bolt to what feels tight and call it done? I’ve seen aluminum threads strip because someone guessed. This BMW 318, 323, 325, 321, 326 Workshop Manual is the same binder that came out of Munich’s service department. 589 pages of factory procedures, not aftermarket fiction. Every spec in here was tested by Bayerische Motoren Werke AG – not some copy shop in Ohio.

Torque values on page 3 are for bolts per DIN 912, 931, 933, and 960 with specific nut heights. The table tells you exactly what to use for phosphate‑treated bolts with or without oil. If you grab cadmium‑plated fasteners, the manual says reduce the torque 30% under the same utilization factor. That detail is what keeps a job from coming back on a flatbed.

Group numbering follows the factory Flat Rate Catalog. Page 2 lays out the whole structure: Maintenance and General Information, Tightening Torques, Bolts and Nuts, a Conversion Table for Statutory Units, and General Specifications. You don’t flip through guesswork – you go straight to the group and subgroup numbers. 32‑21/6 means main group 32, subgroup 21, page 6 of that subgroup. That system hasn’t changed in decades.

Tightening Torques and Preload Forces

Page 3 is where you live during any engine or drivetrain job. The torque table covers bolts from M6 to M20 with yield point utilization factor s = 0.14. It also notes that for self‑locking screw connections or bolts with expansion shafts, you have to determine values separately – the standard table doesn’t apply. That kind of exception is exactly what a Chilton reprint leaves out.

589 Pages of Factory Documentation

That’s not a binder of generic write‑ups. It’s the complete workshop manual BMW issued to dealer techs. The introduction says it “guarantees that maintenance and repair work is done in the correct manner.” Every procedure describes removal first; installation notes appear only when the reverse sequence isn’t obvious. Supplements and bulletins get filed as additions – this is a living document, not a static print.

Maintenance and General Information: The Foundation

The first main group – 00 – covers the basics that most shops skip because they think they know them. Torque sequences, fluid capacities, and the conversion table between metric and Imperial units. If you’re working with a mix of old and new hardware, that table on page 2 keeps you from cross‑threading something expensive.

What Is on Page 2?

The table of contents for the whole manual. “Tightening Torques and Preload Forces”, “Bolts and Nuts”, “Conversion and Comparison Table for Statutory Measurement Units”, and “General Specifications”. That’s the spine of the book. You can see the full scope without flipping through every page.

If electrical problems are what you’re chasing, pair this workshop manual with the BMW 3 Series 1998 Electrical Troubleshooting Manual. The factory wiring diagrams in that manual match the group system here. For later models, grab the BMW E36 1999 Electrical Troubleshooting Manual or the BMW 3 Series E36 1996 Electrical Troubleshooting Manual. Each one was written the same way – by BMW engineers, not aftermarket editors.

Get the Right Torque Specs from the Source

Aftermarket manuals cut corners. They copy the numbers but leave out the conditions. Page 3 of this manual tells you the lubricated condition and bolt surface treatment that each torque value assumes. If you ignore that, you’re not following the spec – you’re gambling. This is the original OEM document printed in Germany with the copyright by Bayerische Motoren Werke AG. No reprints, no copy.

For a broader look at how automotive service documentation is structured, see the Automotive Industry Overview and the Automotive Industry Overview for comparison. But for BMW 318, 323, 325, 321, 326 models, this manual is the authority.

Does This Manual Cover the 318is Model?

Yes, the 318 is listed in the title and covered fully.

What Torque Values Are Given for Cylinder Head Bolts?

The manual provides tightening torques for bolts under various conditions. For example, page 3 covers bolts to DIN 912, 931, 933 and nuts with specific nut height. It specifies that for cadmium plated bolts, torque must be reduced by 30% in the same utilization factor. You won’t find that nuance in a Chilton’s reprint. This is the factory document from BMW’s service department, printed in Germany, with group numbering from their Flat Rate Catalog. That’s the level of detail you need when reassembling an M20 engine.

Stop working from memory or internet forums. Get the real factory data and access the factory manual.