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).

Eli realized the van had been less an object to be repaired than a ledger of obligations. Each fix returned something to someone—time, a memory, closure. The manual had been Josef's way of teaching future hands to treat machines as caretakers of lives.

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

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

Conclusion: Your W639 Cannot Survive Without It

The Mercedes-Benz W639 is a sophisticated commercial vehicle that blurs the line between cargo van and luxury people-mover. Its advanced diesel engines, CAN-bus electronics, and complex comfort systems mean that guessing is never an option.

Eli read aloud, his voice gruff but careful: "If the idle is rough, check the throttle cable. If someone has left a photograph in the glove box, keep it. It is never 'just a photograph.'"

1. Engine Mechanics (OM646, OM642, M272)

The W639 hosted several engines. Your manual must differentiate.

It is the most accurate and exhaustive source, providing step-by-step disassembly/assembly, exact torque settings, and detailed wiring diagrams.