🏷️ Basic Information

Make:

Mercedes-Benz

Model:

SL-Class

Chassis Code:

R107 / C107

Model Year:

1983

Chassis Codes Explained:

R107: Roadster designation. C107: Coupe designation.

Engine Codes:

M110, M116, M117 (specific to 1983)

👋 Introduction

Market Position:

A definitive resource for owners and independent mechanics of the 1983 Mercedes-Benz R107/C107 SL-Class, offering dealership-level diagnostic and repair capabilities.

Competitive Analysis:

Distinguishes itself from generic repair guides by providing vehicle-specific, factory-accurate information, including diagrams, schematics, and specifications, directly usable for accurate repairs.

Key Features:

Comprehensive A-Z coverage, vehicle-specific data, step-by-step instructions, detailed diagrams and illustrations, wiring schematics, printable pages, digital format for easy access and management.

Diagrams Illustrations:

High-quality diagrams and illustrations are integral to the manual, aiding in visual understanding of complex procedures and component identification.

📋 Manual Details

Coverage Areas:

All models and all repairs A-Z for the 1983 R107/C107 SL-Class. Vehicle specific, not generic.

Specific Model Variants:

Covers all R107 and C107 variants applicable to the 1983 model year, including different engine displacements and trim levels.

Page Count:

Not specified, but described as comprehensive and complete on one PDF.

Manual Type:

Service and Repair Manual

Language:

English

Language Clarity:

English, written with technical clarity suitable for automotive professionals and skilled DIYers.

Format:

PDF (Printable)

Searchability:

PDF format allows for keyword searching for quick access to specific topics.

📖 Manual Coverage

Systems Covered:

Maintenance, Engine, Control System, Mechanical, Fuel Service Specifications, Emission Control, Intake/Exhaust/Cooling, Lube, Ignition/Starting/Charging, Automatic Transmission/Clutch, Manual Transmission, Transfer Propeller Shaft, Drive Shaft, Differential, Axle/Suspension, Tire & Wheel, Brake Control, Brakes, Parking Brake, Steering Column, Power Steering, Air Conditioning, Supplemental 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, and more.

Electrical System Details:

Comprehensive wiring schematics for all circuits, including engine management, lighting, instruments, power accessories, and HVAC.

Body And Interior:

Detailed procedures for body panel repairs, door mechanisms, seat adjustments, interior trim removal and installation, and glass replacement.

Suspension And Steering:

Detailed overhaul and adjustment procedures for front and rear suspension, steering box, and power steering pump.

Procedures Included:

Complete step-by-step instructions for maintenance, servicing, diagnosis, and repair. Includes troubleshooting, component replacement, adjustments, and rebuilding procedures.

Diagnostics Procedures:

Step-by-step diagnostic flowcharts and troubleshooting guides for common and complex issues across all systems.

Air Conditioning Service:

Procedures for system charging, leak detection, component replacement (compressor, evaporator, condenser), and climate control system diagnostics.

Brake System Overhaul:

Procedures for caliper rebuilds, rotor and pad replacement, brake line replacement, and bleeding the brake system.

Technical Depth:

Factory highly detailed repair manuals, equivalent to technician-level dealership documentation. Covers advanced diagnostics and complete repair procedures.

Engine Rebuild:

Detailed procedures for engine disassembly, inspection, machining, and reassembly, including torque specifications, clearances, and component tolerances.

Fuel System Diagnosis:

In-depth guidance on diagnosing and repairing the K-Jetronic fuel injection system, including pressure testing, component testing, and adjustment procedures.

Torque Specifications:

Comprehensive list of all critical torque specifications for engine, chassis, and suspension components.

📊 Manual Specifications

File Format:

PDF

Print Quality:

High resolution, printable. Images can be blown up and enlarged for printing.

Binding Type:

Digital (PDF) - No physical binding. Printable pages for user convenience.

Paper Type:

N/A (Digital PDF)

Compatibility:

Windows Vista (32 & 64-bit), XP, ME, 98, NT, 2000, and Mac. Requires Adobe PDF Reader and Winzip.

⚙️ Engine Specifications

Primary Engine:

Likely 3.8L V8 (M116) and potentially 5.0L V8 (M117) or 2.8L Inline-6 (M110) for the 1983 model year, depending on specific market and trim.

Engine Variants:

Examples: 380SL (3.8L V8), 500SL (5.0L V8 - if available in the specific market for 1983), 280SL (2.8L I6 - less common in some markets for this year).

Fuel System:

Bosch K-Jetronic (CIS) fuel injection system for V8 engines. Carburetor or fuel injection for I6 models.

Engine Code M110:

2.8L (2799 cc) SOHC Inline-6. Known for smooth power delivery.

Engine Code M116:

3.8L (3839 cc) SOHC V8. Common in the 380SL model.

Engine Code M117:

5.0L (4973 cc) SOHC V8. Found in the 500SL models, offering greater performance.

🔧 Transmission

Standard Transmission:

Typically a 4-speed automatic transmission (e.g., 722.3) for V8 models.

Optional Transmission:

A 4-speed manual transmission was an option for some engine variants, particularly the 280SL.

Transmission Features:

Hydromechanical control, torque converter lock-up clutch (on automatics).

📐 Dimensions

Wheelbase:

2460 mm (96.9 inches)

Length:

4360 mm (171.7 inches)

Width:

1790 mm (70.5 inches)

Height:

1300 mm (51.2 inches)

Curb Weight:

Approximately 1500-1600 kg (3307-3527 lbs) depending on engine and options.

Gross Vehicle Weight Rating:

Varies by specific model variant.

🛡️ Safety Features

Safety Ratings:

Official crash test ratings from this era are less standardized than modern ones. However, the R107 chassis was engineered with significant safety considerations for its time, including a reinforced passenger cell and safety glass.

Active Features:

Four-wheel disc brakes, power steering, anti-lock braking system (ABS) was becoming available on higher-end Mercedes models around this time, but might be optional or not present on all 1983 R107s.

Passive Features:

Three-point seat belts, padded interior surfaces, collapsible steering column, durable body construction.

💡 Technology Features

Infotainment System:

Basic AM/FM radio with cassette player, often with power antenna. Speaker systems were typically limited to door and rear deck locations.

Driver Assistance:

Power steering, cruise control (optional or standard depending on trim), four-wheel disc brakes. ABS was a developing technology and may not be standard on all 1983 models.

Connectivity:

No modern connectivity features such as Bluetooth or USB. Communication would be limited to antenna systems for radio.

🔧 Maintenance

Oil Change Interval:

Typically every 5,000-7,500 miles (8,000-12,000 km) or annually, whichever comes first, depending on driving conditions. The manual will provide precise factory recommendations.

Major Service Interval:

Major services often recommended around 30,000 miles (48,000 km) or 50,000 miles (80,000 km), including spark plugs, fuel filter, air filter, and transmission fluid service. Specific intervals are detailed in the manual.

Engine Oil Spec:

Likely SAE 20W-50 or 10W-40, depending on climate. API Service Classification SG or similar. Manual specifies exact MB approval.

Coolant Spec:

Ethylene glycol based antifreeze, mixed with distilled water. Typically a 50/50 ratio. Specific MB coolant type will be in the manual.

Transmission Fluid Spec:

For automatic transmissions: Dexron III or equivalent. For manual transmissions: GL-4 gear oil. Manual will specify exact MB specification.

Brake Fluid Spec:

DOT 3 or DOT 4 brake fluid. Manual will specify the exact requirement.

Power Steering Fluid Spec:

ATF Dexron II or III, or specific MB power steering fluid. Manual is the definitive source.

Common Issues:

Rust in wheel wells, rocker panels, and under the battery tray. Vacuum line deterioration affecting climate control and engine performance. Hardened rubber bushings leading to suspension noise. Fuel distributor issues with K-Jetronic. Leaking valve cover gaskets. Climate control system (often the servo or vacuum actuators).

Electrical Common Problems:

Frayed wiring harnesses (especially around engine bay), aging electrical connectors, headlight switch issues, and potential for instrument cluster problems.

📚 Vehicle History

Brand Heritage:

Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, and safety, with the SL-Class representing the pinnacle of their roadster offerings.

Model Evolution:

The R107 SL was introduced in 1971, replacing the W113 'Pagoda' SL. It was known for its robust build, elegant styling, and sophisticated engineering. The C107 variant referred to the SLC coupe sibling. The 1983 model year falls within the later production phase of the R107, benefiting from several updates and refinements.

Production Period:

1971-1989 (R107)