2009 Mercedes-Benz Allegro Service and Repair Manual

This factory service and repair manual for the 2009 Mercedes-Benz Allegro is for a bus, and the data describes it plainly: a 1-door bus (non school) with a cab-forward layout, the OMC 1626/51L /51AL trim, and a turbocharged 6.4L inline-six running on diesel fuel and displacing 389 cubic inches. The manual gives procedures, specifications and torque values for the diesel, the driveline, the brakes and the electrical system.

Engines covered

• 6.4L inline-six (389 cu in) — turbocharged, diesel

Body styles covered

• 1-door bus (non school), cab forward

Trims covered

• OMC 1626/51L /51AL

Known issues on the 2009 Allegro. When a 2009 Allegro comes in with a running fault, the diagnostic routines for its turbocharged diesel give a structured place to start, from fuel delivery and boost to engine management and charging. Once the cause is found, the engine procedures and torque values carry the repair through. Coverage continues to the brakes, steering and suspension of the bus chassis, and wiring diagrams lay out the cab-forward vehicle's electrical circuits.