🏷️ Basic Information

Make:

Mercedes-Benz

Model:

SL-Class

Chassis Code:

R107 / C107

Year:

1977

Manual Product Name:

1977 Mercedes R107 & C107 SL-Class Service and Repair Manual

👋 Introduction

Target Audience:

Mercedes-Benz R107/C107 SL-Class owners, independent repair shops, and automotive enthusiasts seeking authentic factory repair information.

Advantage:

Provides precise, dealer-level information essential for maintaining and repairing these classic vehicles, superior to generic repair guides.

Authenticity:

This is the exact same manual used by factory-trained technicians.

Comprehensiveness:

Covers all models and all repairs from A-Z with step-by-step instructions, diagrams, illustrations, wiring schematics, and specifications.

Digital Convenience:

Single PDF file for easy navigation, printing of specific sections, and storage, avoiding physical wear and tear.

📋 Manual Details

Primary Coverage:

All models of R107 and C107 SL-Class for the 1977 model year.

Repair Scope:

A-Z (Comprehensive repairs).

Estimated Page Count:

Information not explicitly stated, but implied to be a comprehensive factory manual.

Type:

Service and Repair Manual.

Language:

English

Digital Format:

PDF

📖 Manual Coverage

Powertrain:

Engine, Fuel System, Lubrication, Cooling, Intake/Exhaust, Ignition, Starting, Charging, Automatic Transmission, Manual Transmission, Clutch, Transfer Case (if applicable), Drive Shaft, Differential, Axles.

Chassis & Suspension:

Suspension Systems (front and rear), Steering System (including power steering), Wheel Alignment Specifications, Tire and Wheel Service.

Braking System:

Hydraulic Brake Control, Brake System Components, Parking Brake System.

Electrical System:

Complete Wiring Schematics, Lighting, Gauges, Instruments, Meters, Audio/Visual Systems, Horn, Windshield Wipers and Washers, Door Locks, Power Windows (if equipped), Cruise Control, Seat Belts, Supplemental Restraint Systems (if applicable, though unlikely for 1977 models), Engine Immobilizer (if applicable).

Body & Interior:

Body Panels, Doors, Hood, Glass, Mirrors, Interior Trim, Seats, Air Conditioning System.

Emission Control:

Emission Control Systems and Specifications.

Maintenance:

Scheduled maintenance, fluid changes, filter replacements, inspections.

Diagnostics:

Troubleshooting guides, symptom-based diagnosis, fault code interpretation (if applicable to the era).

Repair:

Step-by-step repair instructions for all covered systems, component removal and installation.

Adjustment:

Precise adjustment procedures for engine, brakes, suspension, and other components.

Specifications:

Torque values, clearances, fluid types and capacities, electrical specifications.

Depth:

Factory-level detail, suitable for dealership technicians; comprehensive for DIY enthusiasts with mechanical aptitude.

Accuracy:

Vehicle-specific, not generic information, providing exact procedures and data.

📊 Manual Specifications

Format:

PDF

Compatibility:

Windows (Vista 32/64, XP, ME, 98, NT, 2000) and Mac.

Requirements:

Adobe PDF Reader, Winzip (free online).

Printability:

Fully printable, allowing users to print specific pages or diagrams as needed.

Scalability:

Images and diagrams can be enlarged for detailed viewing and printing.

Binding:

N/A (Digital format provides flexibility; no physical binding).

Paper Type:

N/A (Digital format; users print on their preferred paper type).

⚙️ Engine Specifications

Engine Type:

Inline-6 Cylinder (e.g., M110) and V8 (e.g., M117) overhead camshaft engines.

Displacement Range:

Likely 2.8L, 3.5L, 3.8L, 4.5L, 5.0L depending on specific model variant within the 1977 lineup. (e.g., 280SL, 350SL, 450SL).

Horsepower Range:

Varies by engine, typically ranging from approximately 145-200+ hp for 1977 models.

Torque Range:

Varies by engine, substantial torque figures characteristic of Mercedes-Benz engines of this era.

Fuel Delivery:

Bosch mechanical fuel injection (CIS - Continuous Injection System) for most gasoline engines, potentially carburetors on some earlier or specific market variants.

Oil Type:

Specific viscosity grades (e.g., SAE 10W-40, 20W-50) based on ambient temperature, often a premium quality oil recommended.

Oil Capacity:

Detailed in the manual, typically around 5-8 quarts (4.7-7.5 liters) including filter.

Coolant Type:

Ethylene glycol based antifreeze mixed with distilled water.

Systems:

Likely includes features such as catalytic converters (depending on market), EGR, and air injection systems.

🔧 Transmission

Type:

4-speed Automatic Transmission (e.g., 4G-Tronic) was widely standard, especially on larger displacement models.

Type:

Manual Transmission (e.g., 4-speed or 5-speed) may have been available on specific models or markets.

Transmission Fluid:

Specific ATF (Automatic Transmission Fluid) type, typically Dexron II or equivalent.

Fluid Capacity:

Detailed in manual, including torque converter fill.

📐 Dimensions

Body Style:

Two-door convertible with a removable hardtop (SL designation for Sport Leicht, often referred to as a Roadster with a Landaulet-style hardtop).

Wheelbase:

Approximately 2,400 mm (94.5 inches).

Length:

Approximately 4,500 - 4,700 mm (177.2 - 185.0 inches) depending on specific model/bumper configurations.

Curb Weight:

Approximately 1,500 - 1,700 kg (3,300 - 3,750 lbs) depending on engine and equipment.

Gross Vehicle Weight:

Specified in manual, typically around 1,900 - 2,100 kg.

🛡️ Safety Features

Crash Testing:

Early safety standards; detailed official crash test ratings from this era are less common or standardized as today.

Braking:

Four-wheel disc brakes were standard on most models by this era, a significant safety feature.

Steering:

Power steering assisted steering for improved control.

Restraints:

Lap and shoulder belts were standard.

Rollover Protection:

Reinforced A-pillars and windshield frame provided some degree of rollover protection, particularly with the hardtop fitted.

💡 Technology Features

Audio System:

Typically an AM/FM radio with an 8-track player or cassette deck. Speaker placement is integrated into the doors and dashboard.

Cruise Control:

Optional cruise control system, providing a more relaxed driving experience on highways.

Features:

Limited connectivity by modern standards. Features primarily revolve around comfort and convenience within the vehicle.

🔧 Maintenance

Oil Change:

Typically every 5,000 - 7,500 miles (8,000 - 12,000 km) or annually, whichever comes first, depending on driving conditions. Manual will provide specific guidance.

Major Service:

Intervals for spark plug replacement, fuel filter, air filter, transmission service, and coolant changes are detailed, often around 20,000 - 30,000 miles.

Engine Oil Viscosity:

Refer to manual for exact SAE grade based on temperature; common grades include 10W-40 or 20W-50.

Transmission Fluid Type:

Dexron II or equivalent ATF.

Brake Fluid Type:

DOT 3 or DOT 4 hydraulic brake fluid.

Common Problems:

Rust (especially around wheel wells, rocker panels, and convertible top frame), vacuum leak issues affecting climate control and engine performance, potential wear in suspension components, and aging electrical connections.

Engine Maintenance:

Proper maintenance of the fuel injection system (CIS) is crucial for performance and reliability. Valve adjustments and timing chain checks are also important.

📚 Vehicle History

Mercedes Benz Legacy:

Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and luxury automotive manufacturing.

R107 Introduction:

The R107 SL-Class was introduced in 1971 as the successor to the W113 'Pagoda' SL, designed with a focus on enhanced safety and comfort. It became one of the longest-produced Mercedes-Benz platforms.

C107 Variant:

The C107 designation refers to the SLC coupe variant of the same platform, sharing many mechanical components with the R107 SL roadster.

Production Period:

The R107/C107 platform was produced from 1971 to 1989, making the 1977 model part of its mid-production phase.

Market Significance:

The R107 SL represented Mercedes-Benz's commitment to the luxury sports car market, offering a blend of performance, comfort, and iconic styling.

🏆 Awards & Recognition

Historical Acclaim:

While specific 'awards' for a single model year are rare, the R107 SL-Class consistently received acclaim for its build quality, durability, and timeless design, becoming a symbol of automotive prestige.