🏷️ Basic Information Identification Make: Mercedes-Benz Model: SL-Class Model Code: R129 Year: 1989 Codes Chassis Code: R129 👋 Introduction Market Position Positioning: The Mercedes-Benz SL-Class (R129) was positioned as a flagship luxury grand tourer and sports convertible, representing the pinnacle of Mercedes-Benz engineering and comfort for its era. Competitive Analysis Competitors: Competed with vehicles such as the Jaguar XJS, Porsche 911 Cabriolet, and Ferrari Mondial. Key Features Design Highlights: Iconic Pininfarina-influenced styling, advanced safety features for its time (e.g., integrated roll-bar), high-quality interior materials, sophisticated convertible top mechanism. Target Audience: Affluent individuals seeking a stylish, comfortable, and technologically advanced luxury convertible with renowned Mercedes-Benz build quality and reliability. 📋 Manual Details Coverage Areas Coverage Scope: Comprehensive service and repair for all 1989 Mercedes-Benz SL-Class (R129) models. Page Count Estimated Page Count: 800-1200 (typical for comprehensive factory service manuals of this era) Manual Type Type: Factory Service Manual / Workshop Manual Language Language: English Format Format: Digital (PDF) 📖 Manual Coverage Systems Covered Engine Mechanical: Complete overhaul, diagnostics, timing, cooling, lubrication, fuel injection systems. Engine Electrical: Engine control unit (ECU), ignition system, sensors, actuators, wiring diagrams. Transmission: Automatic transmission (e.g., 4-speed 722.3/722.4, 5-speed 722.5 depending on specific engine variant), diagnostics, overhaul, fluid service, electronic control. Drivetrain: Driveshafts, differential, rear axle assembly. Suspension: Front and rear suspension components, struts, springs, control arms, bushings, power steering system. Brakes: Hydraulic system, ABS (Anti-lock Braking System), brake fluid specifications, pad/rotor replacement, caliper overhaul. Steering: Power steering system, steering gear, linkage, alignment specifications. Electrical System: Battery, charging system, starter, lighting, instrumentation, power accessories, convertible top hydraulics, wiring diagrams for all circuits. Body And Interior: Body panel repair, door mechanisms, convertible top operation and repair, interior trim, seats, HVAC system. Climate Control: Air conditioning system operation, refrigerant, components, diagnostics. Diagnostics: Troubleshooting guides, fault codes, diagnostic procedures. Procedures Included Maintenance: Routine service, oil changes, filter replacements, fluid checks and top-offs, scheduled maintenance intervals. Repair: Component removal, installation, overhaul, and replacement for all major systems. Troubleshooting: Step-by-step diagnostic procedures for identifying and resolving common and uncommon problems. Specifications: Torque specifications, clearances, fluid capacities, wear limits, alignment data. Wiring Diagrams: Detailed electrical schematics for all vehicle systems. Technical Depth Depth: From basic maintenance to complete engine and transmission rebuilds, including complex electronic system diagnostics. 📊 Manual Specifications File Format Quality: High-resolution, searchable PDF with clear text and legible diagrams. Print Quality Print Compatibility: Optimized for printing individual sections or the entire manual. Binding Type Binding Recommendation: For printed copies: Spiral or comb binding for lay-flat usability. Paper Type Paper Recommendation: For printed copies: Matte or semi-gloss finish paper for clear diagram reproduction. ⚙️ Engine Specifications Primary Engine Engine Variant 1: 300 SL-24 (M104.980) - 3.0L DOHC Inline-6 Engine Variant 2: 500 SL (M119.960) - 5.0L DOHC V8 Performance 300 Sl-24 Horsepower: 228 hp @ 6,000 rpm 300 Sl-24 Torque: 205 lb-ft @ 4,500 rpm 500 Sl Horsepower: 322 hp @ 5,500 rpm 500 Sl Torque: 354 lb-ft @ 3,750 rpm Fuel System Fuel Injection Type: Bosch KE-Jetronic (500 SL), Bosch HFM (some later 300 SL-24 variants, though 1989 primarily KE-Jetronic) Fuel Type: Premium Unleaded Gasoline Engine Design Engine Block Material: Aluminum-silicon alloy (M119 V8), Cast iron (M104 Inline-6) Cylinder Head Material: Aluminum Cooling System Coolant Type: Mercedes-Benz approved coolant (e.g., G48 or equivalent) mixed 50/50 with distilled water. 🔧 Transmission Standard Standard Transmission: 4-speed automatic transmission (e.g., 722.3 for M119, 722.4 for M104) Optional Optional Transmission: 5-speed automatic transmission (722.5) became available on some models later in the R129's lifecycle, but less common for 1989. Features Transmission Control: Electronic control for shift points and operation, often with sport/economy modes. Fluid Specifications Automatic Transmission Fluid Type: Dexron II (or equivalent MB specification) Fluid Capacities Automatic Transmission Fluid Capacity: Approximately 8.0 - 9.0 liters (varies by model and torque converter drain plug availability). 📐 Dimensions Exterior Length: Approx. 4,450 mm (175.2 in) Width: Approx. 1,810 mm (71.3 in) Height: Approx. 1,290 mm (50.8 in) Wheelbase: Approx. 2,515 mm (99.0 in) Weights Curb Weight 300Sl: Approx. 1,720 kg (3,790 lbs) Curb Weight 500Sl: Approx. 1,850 kg (4,080 lbs) Gross Vehicle Weight Rating: Not explicitly stated for 1989 consumer models, typically around 2100-2200 kg. 🛡️ Safety Features Ratings NHTSA Ratings: Specific NHTSA ratings for the 1989 R129 are not readily available in a standardized format comparable to modern vehicles. However, Mercedes-Benz vehicles of this era were known for robust construction and advanced safety engineering. Active Features ABS: Standard Anti-lock Braking System (ABS) on all models. Traction Control: Optional ASR (Acceleration Slip Regulation) available on some models/markets. Passive Features Airbags: Driver's side airbag was standard. Roll Bar: Automatic, hydraulically operated roll-bar that deploys in milliseconds in the event of a rollover. Seat Belts: Force-limiting front seat belts with pre-tensioners. Body Structure: Reinforced A-pillars and body structure for enhanced occupant protection, particularly in convertible configuration. 💡...