Description
Factory Mercedes 280 SEL Workshop Manual (1974-1980)
This official factory-level workshop manual covers the Mercedes-Benz 280 SEL across its full 1974-1980 production run – the long-wheelbase W116 flagship sedan built for the North American and international markets. All documented procedures match the standards used by authorized Mercedes dealership technicians.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M110 2.8L DOHC inline-6 with Bosch K-Jetronic mechanical fuel injection (~185 hp) |
| Diesel | N/A |
| Transmissions | 4-speed automatic; 4-speed manual |
| Drive | RWD |
| Model Years | 1974-1980 |
| Badge Twins | Mercedes-Benz W116 S-Class series (280 S, 280 SE, 350 SE, 450 SE, 450 SEL) |
Common 280 SEL Repairs Covered
| System | Procedures |
|---|---|
| Bosch K-Jetronic Fuel Injection | Warm-up regulator replacement, fuel distributor cleaning, cold-start valve testing – a common fault on aging M110 engines |
| Timing Chain & Tensioner | M110 dual overhead cam chain inspection, tensioner replacement, valve timing adjustment |
| Automatic Transmission | Fluid and filter service, kickdown cable adjustment, vacuum modulator replacement, torque converter service |
| Suspension & Steering | Front ball joint and control arm bushing replacement, steering box adjustment, rear subframe mount inspection |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What chassis platform does this manual cover?
This manual covers the W116 chassis – Mercedes-Benz’s first purpose-built S-Class. The 280 SEL specifically uses the extended long-wheelbase version of the W116 platform, offering additional rear passenger room compared to the standard 280 SE. All model year revisions from 1974 through the final 1980 production year are included.
Is the M110 engine the same unit used in other W116 models?
Yes. The M110 2.8-liter DOHC inline-six was shared across several W116 variants including the 280 S and 280 SE. This manual provides full engine coverage including valve adjustment specifications, Bosch K-Jetronic injection tuning, compression testing, and complete top-end rebuild procedures applicable across all M110-equipped W116 vehicles.
Are wiring diagrams included for the electrical systems?
Complete wiring diagrams are included, covering the fuel injection circuit, starting and charging systems, lighting, power windows, climate control, central locking, and instrumentation. Diagrams identify connector locations, relay positions, fuse assignments, and ground points to help diagnose the electrical faults common on W116 vehicles of this age.
What format is the manual?
The manual is delivered as a PDF file – fully searchable by keyword, procedure, or specification. It’s printable and compatible with Windows, Mac, iOS, Android, and any modern tablet or smartphone PDF reader. Access begins immediately after purchase with no waiting period.
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