Description
Factory Mercedes R Class R320 CDI Workshop Manual (2006–2009)
This factory-level service manual covers the W251-chassis Mercedes R Class R320 CDI sold in the United States from 2006 through 2009, giving technicians and serious DIYers the same repair depth used in authorized Mercedes-Benz dealer shops.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Diesel | OM642 3.0L V6 CDI turbodiesel (~224 hp / 376 lb-ft) |
| Transmissions | 7G-TRONIC 7-speed automatic (722.9 series) |
| Drive | RWD; 4MATIC AWD (with transfer case procedures) |
| Model Years | 2006, 2007, 2008, 2009 |
| Badge Twins | N/A |
Common R Class Repairs Covered
| System | Procedures |
|---|---|
| OM642 Diesel Injector Seals | Injector sleeve replacement, torque specs, and leak-off testing for known carbon build-up around injector bores |
| 7G-TRONIC (722.9) Transmission | Valve body service, conductor plate replacement, fluid/filter change intervals, and shift adaptation reset |
| Air Suspension (AIRMATIC) | Compressor replacement, air strut diagnostics, ride-height sensor calibration, and leak-down testing |
| Swirl Flap Actuator | Intake manifold swirl flap removal, actuator motor replacement, and EGR system cleaning procedures |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
What chassis designation does this manual cover?
This manual is written specifically for the W251 platform, which underpins all R320 CDI models from the 2006–2009 production run. Coverage includes both the standard and extended long-wheelbase body configurations sold in North America.
Does the manual address the OM642 swirl flap failure — a known issue on this engine?
Yes. The OM642 V6 diesel is well documented for swirl flap actuator failures that can result in broken flap components entering the engine. The manual includes full intake manifold disassembly, swirl flap removal, actuator replacement, and associated EGR cleaning steps to address this concern properly.
Is 4MATIC all-wheel-drive service documented?
Absolutely. Transfer case removal and installation, front differential service, and driveshaft procedures for 4MATIC-equipped R320 CDI variants are fully covered alongside the standard rear-wheel-drive configuration.
What format is the manual?
The manual is delivered as a PDF file. After purchase you receive an instant download link, and the file can be accessed on any Windows or Mac computer, tablet, or smartphone using a standard PDF reader. You may also print pages for bench use, and your download link remains active for life.
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