Description
Factory Mercedes-Benz W126 / C126 Workshop Manual (1979–1991)
This is the complete factory-level workshop manual for the Mercedes-Benz W126 S-Class sedan and C126 SEC coupe, covering every production year from 1979 through 1991 — the full run of one of Mercedes-Benz’s most celebrated platforms.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M103 2.6L I6 (260SE), M110 2.8L I6 (280SE/SEL), M116 3.8L V8 (380SE/SEL/SEC), M117 4.2L V8 (420SE/SEL), M117 5.0L V8 (500SE/SEL/SEC), M117 5.6L V8 (560SEL/560SEC) |
| Diesel | OM603 3.0L inline-6, OM617 3.0L turbodiesel (300SD) |
| Transmissions | 722.3 & 722.4 4-speed automatic; manual gearbox variants |
| Drive | RWD |
| Model Years | 1979–1991 |
| Badge Twins | N/A |
Common W126 / C126 Repairs Covered
| System | Procedures |
|---|---|
| M117 V8 Timing Chain | Chain, guides, and tensioner inspection and replacement — a known wear item on high-mileage 500/560 engines |
| 722.3/722.4 Automatic Transmission | Valve body service, fluid and filter change, modulator valve replacement, full rebuild procedures |
| Hydraulic Self-Leveling Suspension | Rear self-leveling strut replacement and hydraulic system bleeding — common leak and sag issue on older W126s |
| Climate Control (Automatic A/C) | Pushbutton HVAC unit diagnostics, servo motor replacement, evaporator and heater core R&R |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Which specific W126 and C126 model variants are included?
All W126 sedan variants are covered: 260SE, 280SE, 280SEL, 300SE, 300SEL, 380SE, 380SEL, 420SE, 420SEL, 500SE, 500SEL, 560SEL, and the 300SD turbodiesel. C126 coupe models covered include the 380SEC, 500SEC, and 560SEC. Both short and long-wheelbase configurations are addressed with model-specific torque specs and procedures throughout.
Does this manual cover the M117 5.6L V8 found in the 560SEL and 560SEC?
Yes. The M117 5.6L V8 — the top-spec engine fitted to the US-market 560SEL and 560SEC — is fully documented, including fuel injection system service, timing chain procedures, valve adjustment specifications, and complete rebuild data.
Are wiring diagrams included for the W126’s electrical systems?
Full electrical documentation is included: circuit diagrams for engine management, central locking, power windows, power seat adjusters, lighting, and climate control. Connector pinouts, ground locations, and wire color codes all follow factory specifications to aid accurate diagnosis.
What format is the manual?
The manual is a PDF file, compatible with Windows and macOS computers, tablets, and smartphones. The text is fully searchable, and any page or section can be printed for bench use. Access begins immediately after purchase — no shipping required.
Reviews
There are no reviews yet.