1991 Mercedes SL-Class (R129) Service and Repair Manual

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🏷️ Basic Information Identification Make: Mercedes-Benz Model: SL-Class Model Code: R129 Year: 1991 Generation Generation: Third Generation (R129) Codes Chassis Code: R129 👋 Introduction Market Position Vehicle Class: Luxury Grand...

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UGS: 183324

Mots clés: 1991 Car Cars Mercedes Misc R129 SL-Class

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Description

🏷️ Basic Information

Identification

Make:

Mercedes-Benz

Model:

SL-Class

Model Code:

Year:

Generation

Generation:

Third Generation (R129)

Codes

Chassis Code:

👋 Introduction

Market Position

Vehicle Class:

Luxury Grand Tourer (GT)

Target Audience:

Affluent consumers seeking a sophisticated, high-performance convertible

Competitive Analysis

Primary Competitors:

BMW 8 Series Convertible, Jaguar XJS, Porsche 911 Cabriolet, Lexus SC400

Key Features

Convertible Top:

Fully automatic, power-operated soft top with integrated hard cover and rear defroster, a marvel of engineering for its time

Safety Features:

Integrated roll-over bar (Automatic Roll Bar - ARB), advanced ABS system

Comfort And Luxury:

Supple leather upholstery, sophisticated wood trim, advanced climate control, premium sound systems, power-adjustable seats with memory

Handling And Performance:

Sophisticated multi-link suspension, powerful V8 or V12 engines, refined ride quality

📋 Manual Details

Coverage Areas

Coverage Statement:

Covers all models and all repairs A-Z

Page Count

Estimated Page Count:

Approximately 1000+

Manual Type

Manual Type:

Service and Repair Manual

Language

Language:

English

Format

Format:

Digital (Likely PDF, searchable text implied)

📖 Manual Coverage

Systems Covered

Engine Systems:

Engine mechanical, fuel injection, ignition, lubrication, cooling, exhaust

Transmission Systems:

Automatic transmission (4-speed 4G-TRONIC, 5-speed 5G-TRONIC where applicable for the year), clutch, driveshaft, differential

Brake Systems:

Front and rear brakes, ABS (Anti-lock Braking System), parking brake

Suspension Steering:

Front and rear suspension components, steering gear, power steering

Electrical Systems:

Battery, charging system, starting system, lighting, instruments, dashboard, body electrical, climate control electronics, convertible top hydraulics and electronics

Body Chassis:

Body construction, doors, hood, trunk, bumpers, convertible top mechanism, interior trim

Comfort Convenience:

Climate control system (A/C), power windows, power seats, central locking, cruise control, convertible top operation

Procedures Included

Maintenance Procedures:

Oil changes, filter replacements, fluid checks and changes, spark plug replacement, belt inspection/replacement, brake pad/rotor replacement, tire rotation

Troubleshooting Diagnostics:

Fault code diagnosis, symptom-based troubleshooting, electrical system diagnostics, engine performance issues

Repair Procedures:

Engine overhaul, transmission repair, brake system repair, suspension component replacement, steering system repair, electrical component repair/replacement, convertible top repair

Alignment Specifications:

Wheel alignment angles (camber, caster, toe)

Diagnostic Procedures:

Detailed diagnostic flowcharts and explanations for various systems

Technical Depth

Depth Of Coverage:

Factory-level technical information, suitable for dealership technicians

Detail Level:

Comprehensive repair instructions with diagrams, torque specifications, and component testing procedures

Special Tools:

Identification and usage of specialized Mercedes-Benz tools

📊 Manual Specifications

File Format

Digital Format Quality:

High-resolution scans or digitally native content, ensuring readability of diagrams and text

Searchability:

Searchable text capabilities for quick information retrieval

Print Quality

Diagram Clarity:

Clear, precise line drawings and exploded views for component identification and assembly

Binding Type

Binding Type:

N/A (Digital Format)

Paper Type

Paper Type:

N/A (Digital Format)

⚙️ Engine Specifications

Primary Engine

Engine Variant 1991:

M119.960 (4.2L V8)

Engine Displacement 42L:

4196 cc (256 cu in)

Engine Configuration 42L:

V8, 32-valve (4 valves per cylinder)

Engine Block Material 42L:

Aluminum-silicon alloy

Bore Stroke 42L:

92.0 mm x 78.9 mm

Compression Ratio 42L:

10.0:1

Horsepower 42L:

275 hp @ 5700 rpm (SAE Net)

Torque 42L:

387 Nm (285 lb-ft) @ 3700 rpm (SAE Net)

Engine Variant 1991 Alt:

M119.970 (5.0L V8)

Engine Displacement 50L:

4973 cc (303 cu in)

Engine Configuration 50L:

V8, 32-valve (4 valves per cylinder)

Horsepower 50L:

322 hp @ 5500 rpm (SAE Net)

Torque 50L:

480 Nm (354 lb-ft) @ 3900 rpm (SAE Net)

Fuel System

Fuel Delivery System:

Bosch KE-Jetronic (CIS-E) fuel injection (mechanical/electronic hybrid) for 4.2L, Bosch LH-Jetronic for 5.0L and later models

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher)

Engine Management:

Electronic Engine Control (EEC)

🔧 Transmission

Standard

Standard Transmission:

4-speed Automatic (4G-TRONIC, 722.4)

Optional

Optional Transmission:

5-speed Automatic (5G-TRONIC, 722.6) - Introduced later in the R129 generation, may not be present on all early 1991 models.

Features

Shift Modes:

Economy (E) and Sport (S) modes

Transmission Fluid Type:

MB 236.1, MB 236.3, or equivalent DEXRON II (Consult manual for specific application)

📐 Dimensions

Exterior

Length:

Approximately 4450 mm (175.2 in)

Width:

Approximately 1810 mm (71.3 in)

Height:

Approximately 1300 mm (51.2 in)

Wheelbase:

2500 mm (98.4 in)

Front Track:

Approximately 1530 mm (60.2 in)

Rear Track:

Approximately 1525 mm (60.0 in)

Weights

Curb Weight:

Approximately 1800-1950 kg (3970-4300 lbs), depending on engine and options

Gross Vehicle Weight Rating:

Approximately 2200-2350 kg (4850-5180 lbs)

Towing Capacity:

Not specified/intended for towing

Cargo

Trunk Volume:

Approximately 0.26 m³ (9.2 cu ft) with soft top up

🛡️ Safety Features

Ratings

Safety Rating Era:

While official NCAP ratings were not prevalent in 1991, the R129 was designed with significant safety advancements for its era.

Active Features

Standard Anti-lock Braking System (ABS)

Traction Control:

Optional ASR (Acceleration Slip Regulation) was introduced in later models, check specific vehicle

Passive Features

Roll Over Protection:

Automatic Roll Bar (ARB) system deploying instantly in a rollover scenario, a groundbreaking feature

Airbags:

Driver's side airbag standard

Seatbelts:

Three-point inertia-reel seatbelts with pretensioners

Body Structure:

Reinforced A-pillars and body structure for enhanced crash protection

💡 Technology Features

Infotainment

Audio System:

Premium sound system with AM/FM stereo, cassette player. Some models may have optional CD changer integration.

Climate Control:

Automatic climate control with advanced features for temperature and air distribution management.

Driver Assistance

Cruise Control:

Standard cruise control system.

Power Seats:

Electrically adjustable front seats with memory function for driver's seat.

Connectivity

Diagnostics Port:

OBD-I diagnostic port (typically under the hood) for early engine and system diagnostics. Manual details access and interpretation.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 15,000 km (9,000 miles) or 12 months, whichever comes first (with synthetic oil).

Major Service Interval:

Refer to manual for specific mileage/time intervals for transmission fluid, coolant, brake fluid, and other major component checks.

Fluid Specifications

Engine Oil Specification:

API SJ or higher, ACEA A3/B3 or equivalent, viscosity grade 0W-40 or 5W-40 (e.g., Mobil 1 Formula M, Castrol Syntec) or 10W-30/10W-40 for older specs. Always consult manual.

Engine Oil Capacity 42L:

Approximately 8.0 liters (8.5 US quarts) with filter change

Engine Oil Capacity 50L:

Approximately 8.0 liters (8.5 US quarts) with filter change

Coolant Specification:

Mercedes-Benz approved coolant (e.g., MB 325.0) mixed with distilled water (50/50 ratio)

Brake Fluid Specification:

DOT 4 or DOT 4 Plus

Known Issues

Wiring Harness:

Degradation of insulation on wiring harnesses (especially older ones) due to age and heat, leading to electrical gremlins. The manual will detail how to inspect and potentially repair/replace these.

Convertible Top Hydraulics:

Leaking hydraulic lines or pump failure for the convertible top. Manual covers troubleshooting and replacement procedures.

Mas Sensor:

Mass Airflow Sensor (MAS) issues on later models can affect engine performance. The manual will provide diagnostic steps.

Interior Plastics:

Cracking or fading of interior plastic components due to UV exposure and age. Manual may offer some cosmetic repair guidance.

Seat Heater Elements:

Failure of seat heating elements or their wiring. Manual covers seat removal and electrical checks.

📚 Vehicle History

Brand Heritage

Mercedes Benz Legacy:

Mercedes-Benz has a long-standing reputation for engineering excellence, luxury, and safety, particularly with its SL line.

Model Evolution

R129 Introduction:

The R129 generation debuted in 1989 as a successor to the acclaimed R107 SL-Class.

Design Philosophy:

Represented a significant leap forward in technology, safety, and aerodynamics compared to its predecessor.

Production

Production Years:

1989-2001

Manufacturing Plant:

Sindelfingen, Germany

Engine Options Overview:

Initially offered with 3.0L inline-six and 5.0L V8 engines. The 4.2L V8 and later 6.0L V12 (SL 600) were introduced in subsequent years.

🏆 Awards & Recognition

Recognitions

Historical Recognition:

The R129 SL-Class was widely praised upon its release for its advanced engineering, safety, and luxury, solidifying Mercedes-Benz's reputation in the high-end convertible market.