Step-by-step roller guide adjustment to fix alignment and wind noise.
A comprehensive W638 manual covers several core areas, specifically designed for the gasoline ( M111cap M 111 ) and diesel ( ) variants. 1. Engine Management (Diesel Focus: OM611 CDI)
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The W638 relies on a MacPherson strut front suspension and an independent trailing arm rear setup. Due to the vehicle's heavy payload capacity, bushings and ball joints require regular inspection.
The manual explicitly dictates using specific ceramic paste to avoid injectors seizing in the head—a common failure point ( Step-by-step roller guide adjustment to fix alignment and
A clogged fuel filter causes hard starting and high-pressure fuel pump wear. Replace this filter every 20,000 miles (32,000 km).
| Category | Details Covered | |----------|----------------| | | OM 601, 604, 611 diesel; M 111 petrol – timing chain replacement, injector pump calibration, head gasket procedure. | | Transmission | 5-speed manual (717.4), 4-speed auto (722.6) – clutch alignment, valve body repair. | | Suspension & Steering | Front McPherson strut, rear semi-trailing arm – alignment specs, bush replacement. | | Brakes | ABS, ESP, vacuum booster – bleeding sequence, sensor calibration. | | Electrics | Full color wiring schematics – central locking failures, window regulator fixes, ECU pinouts. | | Body & Interior | Sliding door adjustment, dashboard removal, A/C evaporator replacement. | Engine Management (Diesel Focus: OM611 CDI) To help
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460 Nm (Requires a heavy-duty breaker bar and torque multiplier).