Workshop Manual — W639

To get the most out of a Mercedes-Benz W639 (Vito/Viano) workshop manual, it is best to use a combination of official documentation for complex systems and step-by-step DIY guides for routine maintenance. Where to Find W639 Manuals

Official Owner's Manuals: For basic operation and service schedules, download official digital versions from the Mercedes-Benz Vans website.

Comprehensive Workshop Manuals: High-detail manuals for major repairs (engine, transmission, electrical) can be purchased or accessed through platforms like WorkshopManuals.org or ALLDATA DIY.

Step-by-Step DIY Guides: For specific maintenance tasks like changing brake pads, oil, or filters, AUTODOC CLUB provides free illustrated PDF guides and video tutorials. How to Use the Manual: A Quick Guide Mercedes-Benz Vito LCV (W639) from 2003 to 2014

This is a specific request, as Mercedes-Benz does not publish a single unified "Workshop Manual" for the W639 (Viano / Vito / Marco Polo) for public sale. Instead, the official information is split across the WIS (Workshop Information System) and ASRA (Work Time System).

Below is a practical guide to finding, accessing, and using a W639 workshop manual, including legal, OEM, and third-party options. w639 workshop manual

3. Understanding the Electronics

The W639 is heavily electronic. From the CAN-bus system to the SAM modules (Signal Acquisition Module), a simple wrong connection can blow fuses or worse. A proper workshop manual includes Current Flow Diagrams. If you are trying to install an aftermarket stereo, auxiliary lights, or diagnose a battery drain, these diagrams are invaluable. They show you the ground points and splice locations, saving you from guessing which wire does what.

1. Engine Mechanics (OM646, OM642, M272)

The W639 hosted several engines. Your manual must differentiate.

• OM646 (4-cylinder diesel): Look for timing chain replacement procedures. This engine is notorious for chain stretch. The manual must show how to lock the camshafts using tool #601 589 00 40 00.
• OM642 (V6 diesel): You need oil cooler seal replacement steps. This requires removing the intake manifold and EGR cooler. No guesswork allowed.
• M272 (V6 petrol): Balance shaft wear and idler pulley torques.

6. Practical Recommendation for DIY Mechanic

Best single source for most owners:
Buy the Haynes manual #6345 (print) + supplement with a free Russian-sourced WIS printout for your specific engine code.

If you own a Marco Polo camper:
Add the Marco Polo specific supplement (rare) – otherwise use Viano mechanical sections + separate camper electrics guide.

If you own a Vito with OM642 V6 diesel:
You need the official WIS for oil cooler seal replacement – aftermarket manuals misrepresent the procedure. To get the most out of a Mercedes-Benz

Why the W639 Demands a Professional Manual

Before we discuss the manual itself, we must understand the vehicle. The Mercedes-Benz W639, produced from 2003 to 2014, was a radical departure from its predecessor, the W638. It moved from a semi-bonneted layout to a full-forward control design, sharing its platform with the VW LT and Crafter.

This generation introduced complex electronics, including:

• Full CAN-bus network systems (no simple 12v test light diagnostics here).
• Electronic Stability Program (ESP) with trailer stabilization.
• Diesel particulate filters (DPF) on OM646 and OM642 engines.
• Advanced common-rail diesel injection requiring precise timing and pressure specs.
• Air suspension (AIRMATIC) on high-end Vianos.

A Haynes or Chilton manual might cover oil changes, but a true W639 Workshop Manual is the 5,000+ page bible required to troubleshoot the intricate interplay between the engine control unit (ECU), the transmission control unit (TCU), and the body control module (BCM).

4. Free / Community-Sourced Resources

If you need specific procedures without paying:

• Mercedes-Benz Club forums (W639 section) – e.g., MBClub UK, Benzworld.org. Users share PDFs of official WIS printouts.
• Vito / Viano Facebook groups – Search their "Files" section. Example group: Mercedes Vito & Viano Owners UK.
• Russian torrent sites (rutracker.org) – Look for "Mercedes W639 manual" or "WIS 639". Often complete, but navigation is in Russian/English mixed.

Typical free PDFs you can find:

• W639 Service Information CD 2007 (engine OM646 timing chain)
• Viano electrical troubleshooting 2005 (wiring for rear SAM)
• Vito W639 axle repair (rear diff backlash settings)

Key Components and Systems

1. Engine: Detailed specifications, repair procedures, and troubleshooting guides for the engine, including fuel system, cooling system, and exhaust.

2. Transmission: Information on the manual, automatic, and semi-automatic transmissions, including repair and maintenance procedures.

3. Electrical Systems: Comprehensive diagrams and repair procedures for the electrical systems, including wiring diagrams.

4. Brakes: Maintenance and repair procedures for the braking system, including ABS and brake pad replacement.

5. Suspension and Steering: Instructions for repairs and replacements of components in the suspension and steering systems. OM646 (4-cylinder diesel): Look for timing chain replacement

6. Body and Frame: Repair procedures for body panels, frame, and structural integrity.