🏷️ Basic Information Identification Make: Mercedes-Benz Model: 124 Sedan Model Code: W124 Engine Variant: 300D Turbo Engine Displacement: 3.0 Liters Production Years Covered: 1986-1987 Codes Product Name: Mercedes Benz 124 SEDAN 300D Turbo 3L 1986-1987 WSRM 👋 Introduction Market Position Segment: Mid-size Luxury Sedan Target Audience: Discerning buyers seeking durability, comfort, and German engineering Competitive Analysis Key Competitors: BMW 5 Series (E28/E34), Audi 100/200, Volvo 740/760 Distinguishing Factors: Exceptional build quality, legendary durability, smooth ride, diesel efficiency Key Features Design: Timeless W124 chassis design, robust construction Powertrain: Robust OM603.960 3.0L turbocharged diesel engine known for longevity Ride Quality: Sophisticated independent suspension system providing a refined ride Safety: Early adoption of safety features like crumple zones and ABS (optional) 📋 Manual Details Coverage Areas Primary Coverage: Repair, Maintenance, Troubleshooting, Diagnostics Scope: Comprehensive vehicle service and repair Page Count Estimated Pages: High (Detailed service manuals typically range from 1000+ pages) Manual Type Type: Workshop Service Repair Manual (WSRM) Language Language: English Format Format: Digital PDF Software Requirement: None (Standard PDF reader) 📖 Manual Coverage Systems Covered Engine: OM603.960 Turbo Diesel (Engine overhaul, fuel injection, turbocharger, cooling, lubrication) Transmission: Automatic (4-speed 722.3) and Manual (5-speed 717.4) transmission service and repair Drivetrain: Front suspension, rear suspension, driveshaft, differentials Brakes: Hydraulic brake system, ABS (Anti-lock Braking System) if equipped Steering: Power assisted steering system Electrical: Wiring diagrams, lighting, charging system, starting system, instrument cluster, climate control Bodywork: Exterior panels, interior trim, doors, windows, sunroof Climate Control: HVAC system, R134a conversion (if applicable), heater core, air conditioning Fuel System: Diesel injection pump, injectors, fuel tank, lines Exhaust System: Exhaust manifolds, catalytic converter (if equipped), muffler Procedures Included Maintenance: Routine service, oil changes, filter replacements, fluid checks and changes Troubleshooting: Diagnostic charts and procedures for common issues Repair: Detailed step-by-step repair instructions for all major components Overhaul: Engine, transmission, and differential rebuild procedures Adjustments: Valve adjustments, injection timing, parking brake adjustments Diagnostics: Component testing, electrical circuit analysis, fault code interpretation (if applicable) Technical Depth Depth: Comprehensive (Suitable for professional technicians and advanced DIYers) Detail Level: Component-level disassembly and reassembly, torque specifications, clearances 📊 Manual Specifications File Format File Type: PDF Searchability: Searchable text content Print Quality Resolution: High resolution (suitable for printing) Binding Type Binding: N/A (Digital Download) Paper Type Paper: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Engine Code: OM603.960 Engine Type: Inline-6 Cylinder, Turbocharged Diesel Bore X Stroke: 87.0 mm x 84.0 mm Compression Ratio: 21.0:1 Performance Horsepower: 148 hp @ 4600 rpm (approx.) Torque: 235 lb-ft @ 2400 rpm (approx.) Fuel System Fuel Type: Diesel Injection System: Bosch VE Rotary Injection Pump Turbocharger: Garrett or MHI turbocharger 🔧 Transmission Standard Type: 4-speed Automatic (722.3) or 5-speed Manual (717.4) depending on market and configuration Optional Type: 5-speed Manual Features Automatic Features: Hydraulic torque converter, lock-up clutch Manual Features: Dual-mass flywheel 📐 Dimensions Exterior Wheelbase: 110.4 inches (2804 mm) Length: 189.1 inches (4803 mm) Width: 69.4 inches (1763 mm) Height: 56.1 inches (1425 mm) Weights Curb Weight: 3,505 lbs (1590 kg) approx. Gross Vehicle Weight Rating: 4,740 lbs (2150 kg) approx. Towing Capacity: Refer to owner's manual (typically limited for chassis design) 🛡️ Safety Features Ratings Crash Test Results: NHTSA ratings not readily available for this era; known for robust structural integrity. Active Features ABS: Optional Anti-lock Braking System (ABS) Traction Control: Not typically available on this model Passive Features Airbags: Driver-side airbag standard from 1987; early models may not have it. Seatbelts: 3-point inertia-reel seatbelts front and rear Structure: Reinforced passenger cell, energy-absorbing steering column, side-impact protection 💡 Technology Features Infotainment Radio: Factory AM/FM cassette player with optional CD changer. Speakers: Typically 4 or 6 speaker system. Driver Assistance Cruise Control: Standard cruise control system. Connectivity Bluetooth: Not available (requires aftermarket installation) Aux Input: Not available (requires aftermarket installation) 🔧 Maintenance Service Intervals Oil Change Interval: Every 7,500 miles or 12,000 km (Diesel specific oils recommended) Air Filter Replacement: Every 15,000 miles or 24,000 km, or as needed based on operating conditions. Fuel Filter Replacement: Every 30,000 miles or 48,000 km Transmission Fluid Change: Every 30,000 miles or 48,000 km (Automatic and Manual) Fluid Specifications Engine Oil: API CD or CE rated Diesel Engine Oil, SAE 15W-40 or 10W-40 depending on climate. Check manual for exact spec. Coolant: MB 325.0 (Antifreeze/Coolant Concentrate), typically a 50/50 mix with distilled water. Brake Fluid: DOT 3 or DOT 4 Power Steering Fluid: MB 236.3 (ATF Dexron II or equivalent) Automatic Transmission Fluid: MB 236.3 (ATF Dexron II or equivalent) Known Issues Diesel Specific: Glow plug issues, injection pump leaks, vacuum leaks affecting engine performance, thermostat failures. General W124: Headliner sagging, blower motor resistor failure, vacuum accumulator leaks, coolant leak points (e.g., heater valve, hoses), differential seal leaks, rust in common areas (wheel arches, rocker panels). Electrical: Wire harness degradation (especially in early models), SRS warning light issues,...