This manual covers the 1966 Riviera, LeSabre, Skylark, and GS models. These vehicles have a long-standing reputation for producing reliable, comfortable, and well-appointed automobiles. The 1966 Riviera, a personal luxury coupe, was celebrated for its distinctive styling and powerful V8 engines, often featuring advanced options for its time. The LeSabre offered a spacious and comfortable ride as the full-size sedan, while the Skylark and its performance-oriented GS variant provided a balance of style and sportiness in an intermediate package. These vehicles were engineered with a focus on smooth performance and a premium driving experience, appealing to consumers seeking American automotive quality and style. This comprehensive factory service manual provides detailed information essential for the maintenance and repair of your 1966 Riviera, LeSabre, Skylark, or GS. It covers all factory-equipped engines and transmissions, offering in-depth procedures for routine maintenance, major repairs, and component disassembly and assembly. Included are troubleshooting guides, technical specifications, and crucial safety guidelines, along with detailed wiring diagrams for the electrical system. This manual is an indispensable resource for owners, mechanics, and technicians aiming to preserve the performance, reliability, and longevity of these classic automobiles. 🏷️ Basic Information Identification Make: Buick Model: Riviera, LeSabre, Skylark, GS Year: 1966 Codes Vehicle Identification Code Range: Buick VIN system for 1966 models (typically starting with 4 for GM, followed by series, year, plant, and sequential number) 👋 Introduction Market Position Segment: Full-size personal luxury coupe (Riviera), Full-size sedan (LeSabre), Intermediate/compact car (Skylark/GS) Target Audience: Consumers seeking a premium, stylish, and powerful American automobile; the Skylark and GS offered sporty performance in a more compact package. Competitive Analysis Direct Competitors Riviera: Ford Thunderbird, Chrysler New Yorker, Oldsmobile Toronado (though Toronado was front-wheel drive) Direct Competitors Lesabre: Ford Custom 500, Chevrolet Impala, Chrysler Newport Direct Competitors Skylark Gs: Ford Fairlane, Chevrolet Chevelle, Plymouth Satellite, Dodge Coronet Key Features Riviera Riviera Key Features: Distinctive styling, powerful V8 engines, luxurious interior appointments, often front-wheel drive (though rear-wheel drive was common for the era, Riviera's distinctiveness was paramount). Key Features Lesabre Lesabre Key Features: Spacious interior, comfortable ride, strong V8 engine options, emphasis on traditional American sedan values. Key Features Skylark Gs Skylark Gs Key Features: Sporty styling cues, powerful V8 engines (especially the GS with performance upgrades), upgraded suspension and brakes for improved handling. 📋 Manual Details Coverage Areas Models Covered: Buick Riviera, Buick LeSabre, Buick Skylark, Buick GS (Gran Sport) Engine Coverage: All factory-equipped engines for the 1966 model year Transmission Coverage: All factory-equipped transmissions (e.g., Turbo Hydra-Matic, manual transmissions) Page Count Estimated Page Count: 500-700 pages (typical for a comprehensive factory service manual of this era) Manual Type Manual Type: Factory Service Manual / Shop Manual Language Language: English Format Format: PDF Download 📖 Manual Coverage Systems Covered Engine Mechanical: Engine assembly, disassembly, cylinder head, valve train, pistons, connecting rods, crankshaft, lubrication system, cooling system, timing system, engine diagnostics Engine Performance: Fuel system (carburetion, fuel lines, fuel pump), ignition system (distributor, coils, spark plugs), emissions control systems (if applicable for the era) Transmission Manual: Manual transmission overhaul, clutch system, shifting mechanisms Transmission Automatic: Turbo Hydra-Matic transmission overhaul, hydraulic system, torque converter, shift linkage, transmission diagnostics Chassis Suspension: Front suspension (ball joints, control arms, springs, shock absorbers), rear suspension (leaf springs, shock absorbers), wheel bearings, alignment specifications Brakes: Brake system operation, front and rear brake overhaul (drum brakes likely standard, potential for early disc brakes), brake fluid specifications, hydraulic system, parking brake Steering: Steering gear overhaul (e.g., Saginaw recirculating ball), power steering system, steering linkage, wheel alignment Electrical System: Battery, starter, alternator/generator, ignition system, lighting system, dashboard instruments, wiring diagrams, fuses, relays, power windows/seats (if equipped) Body And Frame: Body panel removal/installation, door mechanisms, window regulators, upholstery, underbody, frame inspection and repair (if applicable) Heating And Air Conditioning: HVAC system diagnosis and repair, heater core, ventilation, A/C system (if factory equipped) Procedures Included Routine Maintenance: Oil changes, filter replacements, lubrication points, tune-up procedures, fluid checks and top-offs Troubleshooting Guides: Diagnostic charts and procedures for common problems in engine, transmission, electrical, and other systems Major Repair Procedures: Complete engine rebuild, transmission overhaul, brake system service, suspension component replacement Component Disassembly And Assembly: Detailed step-by-step instructions for disassembling and reassembling all major components Wiring Diagrams: Comprehensive electrical schematics for all vehicle systems Technical Depth Depth Of Information: Comprehensive, suitable for professional mechanics and advanced DIY enthusiasts; includes specifications, tolerances, diagnostic procedures, and repair instructions for virtually all systems 📊 Manual Specifications File Format File Type: PDF Searchable Text: Yes (assuming a well-scanned and OCR'd PDF) Print Quality Page Resolution: High (suitable for printing clear diagrams and text) Binding Type Binding Type: N/A (Digital Download) Paper Type Paper Type: N/A (Digital Download) ⚙️ Engine Specifications Primary Engine Riviera Standard Engine: 401 cu in (6.6 L) Nailhead V8 Riviera Optional Engines: 425 cu in (7.0 L) Wildcat V8...