Manual Coverage
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Systems Covered
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Engine Mechanical:
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Engine removal/installation, crankcase, cylinder head, engine breathing, crank assembly, timing, valves, lubrication, cooling system, mounting
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Fuel System:
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Diesel injection system, carburetor system (for gasoline variants not specified but listed in sections), mechanically/electronically controlled gasoline injection systems (for gasoline variants not specified but listed in sections), fuel system components
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Forced Induction:
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Exhaust gas turbocharger (for Turbo models)
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Electrical Engine:
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Ignition system, preheating system, starter, alternator
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Transmission Drivetrain:
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Clutch, manual transmission, automatic transmission, transfer case (if applicable), pedals, throttle control, throttle linkage, longitudinal regulating shaft, front wall regulating shaft, accelerator pedal
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Suspension Steering:
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Frame, suspension, front axle, rear axle, trailing axle, wheels, chassis measurements, steering
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Brakes:
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Hydraulic and mechanical brake system, pneumatic system and auxiliary brakes (likely for heavier duty variants or specific configurations)
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Body Chassis:
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Body general, understructure, front end, front wall, side wall, rear wall, rear end, roof, glass, windows, interior equipment, doors, trunk lid, fuel flap, slide roof/sun roof, top, racks, body sealing, anti-corrosion protection, paintwork
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Electrical Body:
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General electrical system, equipment and instruments, speed control systems, radio, windshield washer system, light range regulator
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Climate Control:
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Climate control systems
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Auxiliary Systems:
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Air compressor, belt drives, auxiliary drives, hydraulic and articulated systems, emergency equipment, sanitary equipment, kitchen, attachments, outside flaps
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Interior Trim:
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Seats, cots, restraint systems, body noises, sound insulation
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Procedures Included
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Maintenance:
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Scheduled maintenance, fluid level checks, lubrication, filter changes
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Diagnostics:
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All diagnostic procedures covered
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Repair:
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Step-by-step repair instructions for all covered systems
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Rebuilding:
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Rebuilding procedures for major components
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Refurbishment:
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Refurbishment guidance
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Restoration:
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Restoration guidance for classic W123 models
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Troubleshooting:
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Troubleshooting common issues
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Technical Data:
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General technical data, service product specifications (fluids, etc.)
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Operation Usage:
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Operating instructions
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Vehicle Handling:
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Jacking-up, towing-off, laying-up vehicle
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Emissions Control:
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Emission control systems
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Technical Depth
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Depth Of Information:
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Comprehensive (Dealer-level detail)
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Illustrations:
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Detailed illustrations included
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Instruction Style:
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Step-by-step instructions
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Maintenance
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Service Intervals
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Oil Change Interval Diesel:
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Typically every 3,000-5,000 miles or 6-12 months (consult manual for exact specifications)
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Fuel Filter Interval Diesel:
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Recommended replacement every 15,000-30,000 miles (consult manual)
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Fluid Specifications
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Engine Oil Spec Diesel:
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API CD or higher (e.g., 15W-40, 20W-50 depending on climate - consult manual)
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Coolant Type:
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Ethylene Glycol based coolant (e.g., Mercedes-Benz approved)
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Transmission Fluid Auto:
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Dexron II or equivalent (verify with manual)
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Known Issues
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Common W123 Issues:
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Vacuum leaks (door locks, climate control), glow plug issues, rust (especially on earlier models and rear wheel arches/trunk floor), suspension wear (bushings), injector pump maintenance, potential for head gasket issues on high-mileage engines.
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