Description
Factory Mercedes S Class S420CDI Workshop Manual (2006–2009)
This is the official factory-level service manual for the Mercedes-Benz S Class S420CDI, covering every repair and maintenance procedure technicians need for the W220 chassis diesel flagship — the same documentation used in authorized Mercedes dealerships.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM628 4.0L V8 CDI Turbodiesel (common rail direct injection, ~250 hp / 560 Nm) |
| Transmissions | 5-speed automatic |
| Drive | RWD; LHD and RHD variants |
| Model Years | 2006–2009 |
| Badge Twins | N/A |
Common S420CDI Repairs Covered
| System | Procedures |
|---|---|
| OM628 Timing Chain | Timing chain tensioner inspection, chain replacement, and stretch diagnosis — a known wear item on high-mileage OM628 engines |
| Common Rail Fuel Injection | Injector removal, coding, leak-off testing, and high-pressure pump servicing |
| Air Suspension (AIRMATIC) | Compressor replacement, strut replacement, ride-height sensor calibration, and fault code diagnosis |
| Electrical / COMAND System | Wiring diagrams, connector pinouts, fuse layouts, and COMAND infotainment diagnostic procedures |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Is the OM628 timing chain procedure fully documented?
Yes. The OM628 4.0L V8 CDI is known for timing chain tensioner wear at higher mileages. This manual includes complete chain inspection criteria, tensioner replacement torque specs, and the step-by-step reassembly sequence to bring the engine back to factory tolerance.
Does this cover both standard wheelbase and long wheelbase S Class variants?
Yes. The W220 S420CDI was offered in both SWB and LWB (S420CDI L) configurations. This manual addresses both body lengths, covering chassis-specific differences in suspension geometry, driveshaft lengths, and interior trim procedures.
Are AIRMATIC air suspension diagnostics included?
Absolutely. The W220 S Class uses Mercedes AIRMATIC air suspension, which is a common service item. The manual covers compressor output testing, strut replacement on all four corners, ride-height sensor adjustment, and the electronic fault codes associated with the suspension control module.
What format is the manual?
This manual is delivered as a PDF file immediately after purchase. It is fully searchable by keyword, printable page by page, and compatible with any standard PDF reader on Windows, Mac, or mobile devices. Your download link remains active for lifetime re-access.
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