Description
Factory Mercedes 230 Workshop Manual (1976-1980)
This official factory workshop manual gives US-based owners and technicians complete service and repair coverage for the W123-platform Mercedes 230, spanning the full 1976-1980 production run. Detailed wiring diagrams, torque specs, and step-by-step procedures are all included.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M115 2.3L inline-four (Bosch K-Jetronic fuel injection) |
| Diesel | N/A |
| Transmissions | 4-speed manual, 4-speed automatic |
| Drive | RWD |
| Model Years | 1976-1980 |
| Badge Twins | W123 chassis (shared platform with Mercedes 240D, 280E, 300D) |
Common 230 Repairs Covered
| System | Procedures |
|---|---|
| Bosch K-Jetronic Fuel Injection | Cold-start valve diagnosis, fuel distributor service, warm-up regulator adjustment |
| Engine Cooling System | Thermostat replacement, water pump service, radiator flush and leak diagnosis |
| Rear Axle & Differential | Rear axle seal replacement, differential fluid service, propeller shaft U-joint inspection |
| Brake System | Front disc caliper overhaul, rear drum adjustment, master cylinder rebuild, brake line bleeding |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Why does the K-Jetronic system on my 230 run rough at idle?
A common issue on the M115-equipped 230 is a worn or clogged fuel distributor or a failing warm-up regulator in the Bosch K-Jetronic system. The manual covers full diagnostic procedures, fuel pressure testing, and step-by-step regulator replacement to restore smooth idle and proper fuel delivery.
What chassis platform is the 1976-1980 Mercedes 230 built on?
The 230 rides on the W123 platform, which Mercedes used across several models sold in the US during this era, including the 240D, 280E, 280CE, and 300D. This manual specifically covers the 230 sedan variant sharing that architecture.
Does the manual include wiring diagrams for the electrical system?
Yes. Complete circuit diagrams are included for the charging and starting systems, all lighting circuits, instrumentation, fuse box layouts, relay identification, and accessory wiring – covering all model years from 1976 through 1980.
What format is the manual?
The manual is delivered as a fully searchable PDF file. After purchase you receive an instant download link. The file is compatible with Windows, Mac, iOS, and Android devices, and individual pages can be printed for use in the shop.
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