Description
Factory Mercedes-Benz 350SD & 350SDL Workshop Manual (1986–1991)
This official factory-level service manual delivers complete repair and maintenance coverage for the W126-platform Mercedes-Benz 350SD and 350SDL diesel sedans sold in the US market from 1986 through 1991. Both the standard-wheelbase 350SD and the stretched long-wheelbase 350SDL are fully documented.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM603.97 3.5L inline-6 turbodiesel (~134 hp, 229 lb-ft) |
| Transmissions | 4-speed automatic (W4A040) |
| Drive | RWD |
| Model Years | 1986–1991 |
| Badge Twins | N/A |
Common 350SD / 350SDL Repairs Covered
| System | Procedures |
|---|---|
| Glow Plug System | Glow plug replacement, relay testing, and cold-start fault diagnosis on OM603.97 |
| Fuel Injection / IP | Bosch injection pump timing, idle adjustment, and injector return-line seal replacement |
| Turbocharger | Turbo oil-feed line inspection, wastegate adjustment, and boost leak diagnosis |
| Automatic Transmission | Valve body service, fluid and filter change, modulating pressure adjustment |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What is the difference between the 350SD and 350SDL covered in this manual?
Both models share the same W126 platform and OM603.97 turbodiesel engine. The 350SD is the standard-wheelbase sedan, while the 350SDL rides on a longer wheelbase for additional rear-seat legroom. This manual covers complete mechanical, electrical, and body procedures for both configurations.
Does the manual cover the OM603.97 turbocharger and injection system in detail?
Yes. The OM603.97 3.5L inline-6 turbodiesel section includes Bosch injection pump timing procedures, injector testing, turbocharger inspection and boost specifications, and emission control diagnostics — all critical for maintaining these engines correctly.
Are wiring diagrams included for the climate control and central locking systems?
Full electrical documentation is included, covering engine management, glow plug relay circuits, HVAC, central locking, power windows, lighting, and instrumentation. Wire color codes, connector locations, and ground point maps are all documented for straightforward fault tracing.
What format is the manual?
The manual is a PDF file delivered via instant download. It is fully searchable, printable, and compatible with any standard PDF reader on Windows, Mac, or mobile devices.
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