These workhorse engines are generally reliable but prone to fuel injector leaks ("black death"), EGR valve carbon buildup, and timing chain wear on later OM651 models. The manual outlines injector puller usage and precise timing marks.
High-quality line drawings or schematics are far better than grainy, black-and-white photos. They show exactly how washers, seals, and clips stack together.
: Vehicle identification numbers (VIN), official manufacturer specifications, and special tool requirements. w639 workshop manual
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The Ultimate Guide to the Mercedes-Benz Vito/Viano W639 Workshop Manual These workhorse engines are generally reliable but prone
Serious mechanics or owners performing complex internal engine, transmission, or electrical work. 2. Aftermarket Manuals (e.g., Brooklands Books)
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