Target Audience:
Professional technicians, experienced DIY mechanics, and owners seeking to understand and perform maintenance/repairs on their W123 300D Turbo.
Manual Advantage:
Official factory manual ensures accuracy and completeness, often superior to aftermarket alternatives. Instant download provides immediate access to critical repair information.
Content Highlight:
Hundreds of pages, step-by-step instructions, exploded view diagrams, critical specifications, and comprehensive system coverage.
Owner Empowerment:
Empowers owners to make informed decisions regarding maintenance and repairs, potentially saving significant costs and ensuring proper care.
Engine System:
Detailed diagnostics, repair, overhaul, and component specifics for the OM617.952 3.0L turbocharged inline-5 diesel engine.
Fuel System:
Bosch fuel injection pump system, glow plug system, fuel filters, lines, and tank servicing.
Cooling System:
Radiator, water pump, thermostat, hoses, coolant types, and troubleshooting.
Lubrication System:
Oil pump, oil filter, oil pan, oil pressure, and lubrication specifications.
Ignition System:
Glow plug system, starting system, battery, and charging system.
Transmission System:
Service and repair for both manual and automatic transmissions, including fluid types, capacities, and shift linkage adjustments.
Drivetrain System:
Propeller shaft, universal joints, rear axle, differential, and wheel bearings.
Suspension System:
Front and rear suspension components, springs, shock absorbers, control arms, ball joints, and steering linkage.
Braking System:
Front and rear disc brakes, hydraulic system, brake fluid specifications, bleeding procedures, parking brake.
Steering System:
Power steering system, steering box, steering column, tie rods, and alignment specifications.
Electrical System:
Wiring diagrams, fuses, relays, lighting, gauges, power windows, wipers, and HVAC controls.
Body And Chassis:
Body panel removal/installation, doors, hood, trunk, glass, interior trim, and structural components.
HVAC System:
Heating, ventilation, and air conditioning system diagnosis and repair, refrigerant servicing.
Exhaust System:
Exhaust manifolds, catalytic converter (if applicable for market), muffler, and pipes.
Maintenance Procedures:
Regular service checks, oil changes, filter replacements, fluid checks and top-offs, belt adjustments, and lubrication.
Repair Procedures:
Step-by-step instructions for component repair and replacement across all major vehicle systems.
Troubleshooting Guides:
Diagnostic flowcharts and symptom-based troubleshooting for common issues.
Disassembly And Assembly:
Detailed instructions for taking apart and reassembling components and systems.
Cleaning And Reinstallation:
Procedures for cleaning components before reassembly and proper reinstallation techniques.
Torque Specifications:
Crucial torque values for fasteners to ensure correct assembly and prevent damage.
Depth Of Coverage:
Comprehensive, covering everything from basic maintenance to advanced engine overhaul and electrical diagnostics, suitable for both DIY and professional technicians.
Engine Type:
Turbocharged Direct Injection Diesel
Displacement:
3.0 Liters (2998 cc)
Configuration:
Inline 5-Cylinder
Bore X Stroke:
87.0 mm x 84.0 mm (approximate, subject to variation)
Horsepower Approximate:
125 hp @ 4350 rpm (varies slightly by market and specific year)
Torque Approximate:
180 lb-ft @ 2400 rpm (varies slightly by market and specific year)
Fuel Injection:
Bosch inline mechanical injection pump with turbocharger boost compensation.
Fuel Type:
Diesel fuel (refer to manual for specific cetane rating recommendations)
Turbocharger Details:
Garrett AiResearch (or similar) turbocharger with wastegate control.
Transmission Type Available:
4-speed Manual Transmission (often standard on base models) and 4-speed Automatic Transmission (common option).
Automatic Transmission Model:
Mercedes-Benz 722.118 or 722.119 4-speed automatic (specific variant depends on model year and market).
Automatic Transmission Features:
Hydraulic torque converter, torque limiting in first gear for smoother acceleration, and a lockout mechanism for efficient highway cruising.
Oil Change Interval:
Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, depending on driving conditions. Refer to manual for precise factory recommendation.
Air Filter Replacement:
Every 15,000-30,000 miles (24,000-48,000 km) or as needed based on dusty conditions.
Fuel Filter Replacement:
Typically every 15,000-30,000 miles (24,000-48,000 km). Crucial for diesel longevity.
Engine Oil Type:
API CD or CE rated diesel engine oil, viscosity typically 15W-40 or 10W-40, depending on climate. Refer to manual for exact specification.
Transmission Fluid Type Automatic:
Dexron III or equivalent ATF (Automatic Transmission Fluid). Refer to manual for exact Mercedes-Benz specification.
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid.
Coolant Type:
Ethylene glycol-based coolant, typically a 50/50 mix with distilled water. Refer to manual for specific MB specification.
Common Wear Items:
Engine mounts, suspension bushings, ball joints, vacuum lines (for central locking and climate control), injector seals, and early model climate control components.
Diesel Specific Concerns:
Glow plug system reliability, potential for injector pump leaks, and carbon buildup in intake and exhaust systems due to turbocharging.
