Description
Factory Mercedes R Class R320 CDI 4Matic Workshop Manual (2006–2009)
This official factory-level service manual covers the W251-chassis Mercedes R Class R320 CDI 4Matic — the full-size luxury crossover that combined three-row seating with all-wheel-drive capability for the US market and beyond.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | N/A |
| Diesel | OM642 3.0L V6 CDI Turbodiesel (~224 hp / 510 Nm) |
| Transmissions | 7G-Tronic 7-speed automatic |
| Drive | 4Matic permanent AWD |
| Model Years | 2006–2009 |
| Badge Twins | N/A |
Common R Class Repairs Covered
| System | Procedures |
|---|---|
| OM642 Diesel Fuel System | Swirl flap removal, common-rail injector testing and replacement, high-pressure pump service |
| Air Suspension (AIRMATIC) | Compressor diagnosis, air strut replacement, ride-height sensor calibration |
| 7G-Tronic Transmission | Fluid and filter service, mechatronic unit diagnosis, transfer case maintenance |
| Electrical & Body Electronics | Wiring diagrams, COMAND system faults, ABS/ESP sensor testing, lighting circuits |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Are the notorious OM642 swirl flap issues addressed in this manual?
Yes. The OM642 engine’s intake swirl flaps are a well-documented failure point on the R320 CDI. The manual includes full intake manifold removal procedures, swirl flap actuator diagnostics, and replacement specifications to help you address this issue properly before catastrophic engine damage can occur.
Does this manual cover both standard and extended-wheelbase W251 R Class variants?
Yes. The W251 platform underpins both the short-wheelbase and long-wheelbase R Class configurations sold between 2006 and 2009. Service procedures, torque specs, and dimensional data for both body lengths are included throughout the manual.
Is the 4Matic all-wheel-drive system fully covered, including the transfer case?
Absolutely. The manual provides detailed service procedures for the 4Matic permanent AWD system, including transfer case fluid changes, front and rear differential service, driveshaft removal, and drivetrain component torque specifications.
What format is the manual?
The manual is delivered as a PDF file. You can download it instantly after purchase, search it by keyword, view it on any device with a PDF reader, and print any pages you need at the workbench. There are no shipping delays, and you can re-download it at any time.
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