1990 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: 1990 Generation Generation Name: Third Generation (R129) Generation Start Year: 1989 Generation End Year: 2001 Codes Chassis Code:...

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标签: 1990 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 Name:

Third Generation (R129)

Generation Start Year:

Generation End Year:

Codes

Chassis Code:

👋 Introduction

Market Position

Positioning:

Flagship luxury convertible, aimed at affluent buyers seeking performance, comfort, and advanced engineering.

Target Demographic:

High-net-worth individuals, enthusiasts of German engineering and luxury grand tourers.

Competitive Analysis

Key Competitors:

Porsche 911 Targa/Cabriolet, Jaguar XJ-S, BMW 8 Series (E31), Ferrari 348/F355.

Key Features

Design Philosophy:

Emphasis on safety, advanced technology, and refined performance, setting a new benchmark for open-top motoring.

Innovations:

Integrated roll-over bar, advanced ABS, multi-link rear suspension, electro-hydraulic convertible top system.

📋 Manual Details

Coverage Areas

Model Variants Covered:

All R129 SL models for 1990, including 300SL, 300SL-24, 500SL

Repair Scope:

A-Z (All repairs from basic maintenance to complete overhauls)

Page Count

Estimated Page Count:

1000+

Manual Type

Type:

Factory Service and Repair Manual

Purpose:

Used by dealership technicians

Language

Language:

English

Format

Format:

Digital (likely PDF) or Printed

📖 Manual Coverage

Systems Covered

Engine Mechanical:

Engine assembly, cylinder head, crankshaft, pistons, connecting rods, timing system, lubrication system

Engine Management:

Fuel injection (KE-Jetronic/LH-Jetronic), ignition system, emissions control, engine control unit (ECU) diagnosis

Transmission Manual:

Manual transmission (if applicable for specific models, though R129 was primarily automatic)

Transmission Automatic:

4-speed automatic transmission (e.g., 722.3, 722.4) repair, overhaul, and control systems

Drivetrain:

Driveshafts, differential, axles

Suspension:

Front suspension (struts, control arms, ball joints), rear suspension (multi-link), springs, shock absorbers, self-leveling suspension (if equipped)

Steering:

Power steering system, steering column, steering gear

Brakes:

Hydraulic system, ABS (Anti-lock Braking System), brake discs, pads, calipers, lines, parking brake

Electrical System:

Battery, charging system, starter, lighting, fuses, relays, wiring diagrams

Body And Chassis:

Body panels, doors, hood, trunk lid, convertible top mechanism (hydraulic/electric), frame structure

Comfort And Convenience:

Climate control (HVAC), power seats, power windows, power mirrors, central locking, cruise control

Safety Systems:

Roll-over protection system (automatic deployment), seat belts, airbags (driver side initially on R129)

Procedures Included

Maintenance:

Scheduled maintenance (oil changes, filter replacements, fluid checks), brake service, tune-ups

Diagnostics:

Troubleshooting guides, symptom-based diagnostics, diagnostic trouble codes (DTCs)

Repair And Rebuild:

Component removal, installation, repair, and complete overhaul procedures for all major systems

Calibration:

Engine control unit calibration, sensor adjustments

Wiring Diagrams:

Detailed electrical schematics for all systems

Specifications And Tolerances:

Torque values, clearances, measurements, and wear limits

Technical Depth

Depth:

Comprehensive; covers routine maintenance, complex diagnostics, component-level repair, and complete system overhauls

📊 Manual Specifications

File Format

Format Details:

Likely a high-resolution PDF, optimized for digital viewing and printing of individual pages. Searchable text functionality is a common feature of quality digital manuals.

Print Quality

Quality:

High-resolution images, clear diagrams, crisp text. Designed for clarity and accuracy.

Binding Type

Type:

For printed versions: Likely professional perfect binding or lay-flat spiral binding for ease of use in a workshop environment.

Paper Type

Type:

For printed versions: Durable, glossy or semi-gloss paper stock to withstand workshop conditions.

⚙️ Engine Specifications

Primary Engine

Engine Code 300Sl:

M103.980

Engine Type 300Sl:

3.0L SOHC Inline-6

Displacement 300Sl:

2962 cc (180.7 cu in)

Bore X Stroke 300Sl:

88.5 mm x 80.25 mm

Compression Ratio 300Sl:

9.2:1

Engine Code 300Sl-24:

M104.980

Engine Type 300Sl-24:

3.0L DOHC Inline-6 (24-valve)

Engine Code 500Sl:

M119.960

Engine Type 500Sl:

5.0L DOHC V8 (32-valve)

Performance

Horsepower 300Sl:

187 hp @ 5700 rpm

Torque 300Sl:

195 lb-ft @ 4400 rpm

Horsepower 300Sl-24:

228 hp @ 6400 rpm

Torque 300Sl-24:

203 lb-ft @ 4600 rpm

Horsepower 500Sl:

322 hp @ 5500 rpm

Torque 500Sl:

347 lb-ft @ 3900 rpm

Fuel System

Fuel System Type:

Bosch KE-Jetronic (300SL), Bosch LH-Jetronic (300SL-24, 500SL)

Fuel Type:

Premium Unleaded Gasoline (91 octane or higher)

Oil Capacity

Oil Capacity Approx:

7.5-8.5 liters (depending on engine)

Coolant Capacity

Coolant Capacity Approx:

10-12 liters (depending on engine)

🔧 Transmission

Standard

Transmission Type 300Sl 300Sl-24:

4-speed Automatic (722.3 or 722.4)

Transmission Type 500Sl:

4-speed Automatic (722.3)

Optional

Optional Transmission:

None offered for R129 SL models in 1990.

Features

Transmission Features:

Comfort and Sport modes, torque converter lock-up

Fluid Type

Automatic Transmission Fluid:

MB 236.1 Specification (e.g., MB 000 989 88 03 10, or equivalent ATF like Dexron III/Mercon)

Fluid Capacity

Automatic Transmission Fluid Capacity:

Approx. 7-8 liters (fill)

📐 Dimensions

Exterior

Length:

4470 mm (176.0 in)

Width:

1810 mm (71.3 in)

Height:

1304 mm (51.3 in)

Wheelbase:

2515 mm (99.0 in)

Front Track:

1532 mm (60.3 in)

Rear Track:

1524 mm (60.0 in)

Cargo

Trunk Volume:

Approx. 230-250 liters (with convertible top up)

Weights

Curb Weight 300Sl:

Approx. 1770 kg (3902 lbs)

Curb Weight 500Sl:

Approx. 1810 kg (3990 lbs)

Gross Vehicle Weight Rating:

Approx. 2100-2150 kg

Wheels Tires

Wheel Size Standard:

15-inch alloy wheels

Tire Size Standard:

205/65 VR15

Bolt Pattern:

5x112 mm

🛡️ Safety Features

Ratings

Safety Ratings:

NHTSA and IIHS ratings are not readily available for this era and specific model, but generally considered very high for its time due to engineering. ECE standards apply.

Active Features

Active Safety:

ABS (Anti-lock Braking System), Traction Control System (ASR, standard on 500SL, optional/later on others)

Passive Features

Passive Safety:

Integrated Roll-Over Bar (automatic deployment), reinforced A-pillars, front airbags (driver side), crumple zones, seat belts with pretensioners.

💡 Technology Features

Infotainment

Infotainment System:

Basic AM/FM stereo with cassette player. Optional CD changer. Analog climate control. Focus on driver experience, not complex infotainment.

Driver Assistance

Driver Assistance Features:

ABS, Traction Control (ASR on 500SL).

Connectivity

Connectivity Features:

Limited by era; no integrated Bluetooth or advanced connectivity. Optional telephone installation might have been available.

🔧 Maintenance

Service Intervals

Oil Change Interval:

Every 15,000 km or 1 year, whichever comes first (check manual for specific engine/oil type recommendations).

Major Service Interval:

Refer to manual; typically includes spark plugs, fuel filter, air filter, transmission fluid, brake fluid service around 60,000-100,000 km.

Fluid Specifications

Engine Oil Specification:

MB 229.1, 229.3 (e.g., 0W-40, 5W-40, 10W-40 synthetic or semi-synthetic, depending on climate and engine)

Coolant Specification:

MB 325.0 (Blue) or MB 325.2 (Green) Antifreeze/Coolant concentrate

Brake Fluid Specification:

DOT 4

Power Steering Fluid:

MB 236.3 Specification (MB 000 989 88 03 10, or equivalent hydraulic fluid like Pentosin CHF 11S)

Known Issues

Wiring Harness Degradation:

Concerns with insulation degradation in some older MB models, requiring inspection and potential replacement.

Convertible Top Hydraulics:

Hydraulic lines and cylinders for the soft top can develop leaks over time, requiring repair or replacement. The pump and accumulator also need occasional service.

Mass Air Flow Sensor:

Can become contaminated or fail, affecting engine performance and fuel mixture on LH-Jetronic systems.

Ignition Components:

Distributor cap and rotor (on M103), spark plug wires, and coil packs can require replacement.

Suspension Bushings:

Rubber bushings in suspension and control arms can wear out, leading to noise and handling degradation.

📚 Vehicle History

Brand Heritage

Heritage:

Mercedes-Benz has a long-standing history of producing luxurious and technically advanced grand touring convertibles, dating back to pre-WWII models.

Model Evolution

R107 Successor:

The R129 replaced the venerable R107 SL-Class after a 18-year production run.

R129 Introduction:

Introduced in 1989, it represented a significant leap in automotive safety, design, and technology compared to its predecessor.

Production

Production Period:

1989-2001

Production Locations

Manufacturing Plants:

Bremen, Germany

🏆 Awards & Recognition

Recognitions

Automotive Journalism Awards:

Consistently praised by automotive journalists for its engineering, safety, and performance upon release and throughout its production. Often cited as a benchmark for luxury roadsters.

Ratings

Consumer Reports Ratings:

While specific year ratings might vary, generally recognized for reliability and build quality in its class, though complex systems can require diligent maintenance.

Certifications

Engineering And Safety Certifications:

Designed to meet and exceed all relevant European (ECE) and US Federal Motor Vehicle Safety Standards (FMVSS) for its time.