🏷️ Basic Information Identification Make: Mercedes-Benz Model: G-Class Model Code: W463 Year: 1990 👋 Introduction Market Position Positioning: Premium, robust, off-road capable luxury SUV. Competitive Analysis Competitors: Land Rover Defender, Toyota Land Cruiser, Jeep Wrangler (historically, though G-Class positioned higher). Key Features Longevity: Known for its exceptional durability and off-road prowess, the G-Class has a long production run with minimal fundamental changes. Engineering: Body-on-frame construction, three independently locking differentials, robust suspension designed for extreme conditions. Manual Value Utility: Provides direct access to OEM-level repair information, empowering owners and independent mechanics. Efficiency: Saves time and money by enabling owners to perform their own maintenance and repairs, avoiding dealership labor costs. 📋 Manual Details Coverage Areas Primary Coverage: Service and Repair Scope: All Models & All Repairs A-Z Page Count Estimated Page Count: High (Detailed Factory Manual, exact count not specified but implied to be comprehensive) Manual Type Type: Factory Service Manual / Repair Manual Language Language: English Format Digital Format: PDF Digital Requirements: Adobe PDF Reader, Winzip (Free) Digital Compatibility: Windows (Vista 32/64, XP, ME, 98, NT, 2000), Mac 📖 Manual Coverage Systems Covered Powertrain: Engine, Fuel Service Specifications, Emission Control, Intake Exhaust Cooling, Lube, Ignition Starting Charging, Auto Transmission, Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle Suspension Chassis: Tire & Wheel, Brake Control, Brake, Parking Brake, Steering Column, Power Steering Electrical And Body: Air Condition, Suppl Restraint System, Seat Belt, Engine Immobilizer, Cruise Control, Wiper & Washer, Door Lock, Meter Audio/Visual, Horn, Windshield/Glass Mirror, Instrument Panel, Seat, Engine Hood/ Door, Exterior & Interior, Electrical, Multiplex/Can Communication Procedures Included Maintenance: Scheduled Maintenance, Fluid Changes, Filter Replacements, Lubrication Diagnostics: Troubleshooting Guides, Fault Code Interpretation (Implied by 'Diagnose') Repair: Step-by-step instructions for all mechanical and electrical components Technical Data: Specifications, Torque Values, Clearances, Alignment Data Technical Depth Depth: Factory-level detail for technicians, covering basic maintenance to complex rebuilds and diagnostics. Visuals: Diagrams, Illustrations, Wiring Schematics 📊 Manual Specifications File Format Type: PDF Searchability: Implied searchable text for ease of use Print Quality Printability: All pages printable, with option to enlarge images Binding Type Binding: N/A (Digital PDF) Paper Type Paper Type: N/A (Digital PDF) ⚙️ Engine Specifications Primary Engine Engine Type: Details vary for 1990 G-Class, likely includes naturally aspirated gasoline and diesel variants. Common for the W463 generation would be inline-6 gasoline (e.g., M103) or diesel (e.g., OM602). Displacement Gasoline Example: 3.0L or 3.2L Inline-6 (M103 family) Displacement Diesel Example: 2.5L or 2.9L Inline-5 Diesel (OM602 family) Performance Horsepower Range Typical: Approx. 115-160 hp (depending on engine variant) Torque Range Typical: Approx. 160-220 lb-ft (depending on engine variant) Fuel System Fuel Delivery: Fuel Injection (Bosch KE-Jetronic or similar electronic injection systems for gasoline; indirect injection for diesel). Cooling System Cooling Type: Water-cooled, pressurized system with fan. Lubrication Oil Type Specification: Manual will specify MB 229.1 or similar, typically 10W-40 or 15W-40 for diesel, and 10W-30 or 10W-40 for gasoline. 🔧 Transmission Standard Transmission Type: Likely 4-speed Automatic (e.g., 722.4) or 5-speed Manual Transmission. Optional Transmission Type Optional: Depending on market and specific engine, both automatic and manual options were available. Features Gear Ratios: Detailed gear ratios for both manual and automatic transmissions will be provided in the manual. Transfer Case: Integral part of the drivetrain, featuring a 2-speed transfer case with center differential lock for enhanced off-road capability. Fluid Specifications Automatic Transmission Fluid: Likely requires Dexron III or MB 236.1 specification fluid. Manual Transmission Fluid: GL-4 or GL-5 gear oil, viscosity grade to be specified. 📐 Dimensions Exterior Wheelbase: Approx. 2850 mm (112.2 in) for standard wheelbase. Length: Approx. 4210 mm (165.7 in) for standard wheelbase. Width: Approx. 1760 mm (69.3 in). Height: Approx. 1931 mm (76.0 in). Weights Curb Weight: Approx. 2000-2200 kg (4400-4850 lbs), depending on configuration. Gross Vehicle Weight Rating: Typically around 2800-3000 kg (6170-6610 lbs). Towing Capacity: Up to 3500 kg (7716 lbs) is common for the G-Class. 🛡️ Safety Features Ratings Crash Test Ratings: While formal crash test ratings in the modern sense were less prevalent for 1990 vehicles, the G-Class's robust construction provided inherent safety. Active Features Braking System: Four-wheel disc brakes, often with ABS (Anti-lock Braking System) becoming standard or optional. Traction Control: Locking differentials are a key active safety/off-road feature. Passive Features Body Structure: Reinforced chassis and body structure designed for durability and occupant protection. Seat Belts: Standard seat belts; manual will detail proper usage and maintenance. Supplemental Restraint System: While airbags were not universally standard on the 1990 model, their inclusion (or absence and potential retrofit) would be detailed if applicable. 💡 Technology Features Infotainment Audio System: Original systems would have been basic AM/FM radio with cassette player, potentially with upgraded speakers. Manual will cover removal and replacement procedures. Driver Assistance ABS: Anti-lock Braking System (ABS) was an available or standard feature depending on the exact configuration, details of its...