Description
Factory Mercedes 300D Workshop Manual (1976–1985)
This factory-level service manual gives US owners of the iconic W123-chassis 300D everything needed to maintain and repair one of Mercedes-Benz’s most celebrated diesel sedans — from routine service to complete mechanical overhauls.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM617 3.0L inline five-cylinder naturally aspirated diesel |
| Transmissions | Four-speed automatic, four-speed manual |
| Drive | RWD |
| Model Years | 1976–1985 |
| Badge Twins | N/A |
Common 300D Repairs Covered
| System | Procedures |
|---|---|
| OM617 Diesel Injection | Bosch fuel injection pump removal, rebuild, and timing adjustment — a frequent maintenance item on high-mileage W123 diesels |
| Timing Chain & Tensioner | Chain inspection, tensioner replacement, and valve timing verification procedures |
| Automatic Transmission | Fluid and filter service, shift linkage adjustment, valve body overhaul |
| Rust-Prone Body & Chassis | Floor pan, rocker panel, and chassis inspection plus body repair specifications for W123 corrosion areas |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Does the OM617 injection pump procedure require special tools?
Yes. The manual identifies Mercedes-specific tooling required for injection pump timing and removal on the OM617 engine, including the injection pump locking tool and timing pin. Part numbers and tool specifications are listed so you can source them before starting the job.
Is the W123 300D the only model covered, or does it include the 300CD and 300TD?
This manual focuses specifically on the 300D sedan variant of the W123 platform. The 300CD coupe and 300TD wagon share the same OM617 drivetrain, and much of the mechanical content applies, but body-specific and trim procedures are written for the four-door 300D sedan.
Are complete wiring diagrams included for all model years?
Yes. Electrical coverage spans 1976 through 1985 and includes circuit diagrams for the charging and starting systems, lighting, instrument cluster, climate control, central locking, and all auxiliary circuits, with wire color codes and connector locations noted throughout.
What format is the manual?
The manual is delivered as a PDF file. It is fully searchable, printable, and compatible with Windows, Mac, iOS, Android, and any device running a standard PDF reader. You receive permanent access with unlimited re-downloads after purchase.
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