Mercedes-Benz W123 Workshop Manual (1976–1986)

Description

Factory Mercedes-Benz W123 Workshop Manual (1976–1986)

This is the factory-level repair reference for the Mercedes-Benz W123 platform, covering every chassis and powertrain variant sold in North America and abroad between 1976 and 1986. From routine service intervals to full drivetrain rebuilds, every procedure is backed by OEM specifications and detailed diagrams.

Powertrain & Drive Coverage

Component	Variants Covered
Petrol	M102 2.0L & 2.3L 4-cyl, M110 2.8L inline-6, M123 2.5L inline-6 (200, 230, 230E, 250, 280, 280E)
Diesel	OM615 2.0L 4-cyl, OM616 2.4L 4-cyl, OM617 3.0L 5-cyl (naturally aspirated & turbocharged) (240D, 300D, 300TD)
Transmissions	4-speed manual, 5-speed manual, 4-speed automatic
Drive	RWD
Model Years	1976–1986
Badge Twins	S123 (estate/wagon), C123 (coupe) — same chassis platform

Common W123 Repairs Covered

System	Procedures
OM617 Turbo Diesel	Injection pump timing, pre-chamber glow plug replacement, and turbocharger wastegate service — a well-known maintenance area on 300D models
Fuel & Exhaust	K-Jetronic (CIS) fuel distributor cleaning and Lambda sensor replacement on M110 and M102 petrol engines
Rust-Prone Body & Chassis	Floor pan inspection, sill repair procedures, and undercoating surface preparation — a known weak point on US-market W123s
Automatic Transmission	4-speed automatic fluid and filter service, kickdown cable adjustment, and valve body inspection

Format & Delivery

PDF. Instant download; lifetime re-downloads.

Frequently Asked Questions

Does this manual cover the 300D turbodiesel sold in the US?

Yes. The OM617 3.0L five-cylinder diesel is fully covered in both naturally aspirated and turbocharged configurations. Procedures include injection pump calibration, glow plug system diagnostics, turbocharger inspection, and complete rebuild specifications — all critical for the 300D and 300TD variants popular in the American market.

Does this manual cover the S123 wagon and C123 coupe as well as the sedan?

Yes. All three body styles sharing the W123 platform are included: the W123 four-door sedan, the S123 estate wagon, and the C123 two-door coupe. Body-specific procedures such as tailgate seals on the wagon and coupe-specific door glass adjustments are documented alongside the shared mechanical content.

Are wiring diagrams included for US-spec electrical systems?

Full electrical coverage is provided, including circuit diagrams for the charging system, ignition, lighting, instrumentation, and climate control. Both European and North American electrical configurations are documented, with color-coded wire identification and connector pinouts to help trace faults on federalized vehicles.

What format is the manual?

The manual is delivered as a PDF file. After purchase you receive an instant download link and can re-download at any time. The file is fully searchable and compatible with Windows, Mac, iOS, and Android devices.