Description
Factory Mercedes-Benz 450 SEL Workshop Manual (1972–1980)
This official factory-level repair manual covers the Mercedes-Benz 450 SEL (W116 chassis) for every model year from 1972 through 1980 — Mercedes’ flagship S-Class sedan of the era and a benchmark for engineering excellence in the American luxury market.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M117 4.5L V8 with Bosch K-Jetronic mechanical fuel injection (~225 hp) |
| Diesel | N/A |
| Transmissions | 3-speed automatic (all variants) |
| Drive | RWD |
| Model Years | 1972–1980 |
| Badge Twins | Mercedes-Benz 450 SE (shorter wheelbase W116 sibling) |
Common 450 SEL Repairs Covered
| System | Procedures |
|---|---|
| Bosch K-Jetronic Fuel Injection | Warm-up regulator diagnosis, fuel distributor service, injector cleaning and pressure testing — a known weak point on aging M117 engines |
| Automatic Transmission | Fluid and filter replacement, band adjustment, valve body removal, and internal rebuild procedures |
| Self-Leveling Rear Suspension | Hydraulic level control diagnosis, strut replacement, and fluid leak repair — a frequently cited maintenance item on W116 models |
| Electrical & Wiring | Complete circuit diagrams, fuse box layouts, power window motor service, central locking system repair, and ground point specifications |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Does this manual cover the W116 chassis specifically?
Yes. The 450 SEL was built exclusively on the W116 platform throughout its 1972–1980 production run. This manual addresses W116-specific systems including the self-leveling rear suspension, long-wheelbase body structure, and all chassis updates introduced across model years.
Is this the same manual that covers the standard 450 SE?
There is significant overlap since both the 450 SE and 450 SEL share the W116 platform and M117 powertrain. However, this manual is specifically compiled for the 450 SEL, which features a longer wheelbase and distinct rear suspension tuning. Shared systems such as the engine and transmission are fully covered.
Are Bosch K-Jetronic fuel injection procedures included?
Yes. The manual provides detailed diagnostics and service steps for the M117’s Bosch K-Jetronic mechanical fuel injection system, covering fuel pressure testing, warm-up regulator inspection, control pressure adjustment, injector service, and cold-start valve diagnosis.
What format is the manual?
This manual is delivered as a PDF file immediately after purchase. It is fully searchable, zoomable for detailed diagrams, and compatible with any device — desktop, tablet, or smartphone. Individual pages can be printed for bench reference as needed.
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