Target Audience:
Mercedes-Benz R129 SL-Class owners and independent repair professionals seeking detailed service and repair information.
Manual Purpose:
Provides practical, high-quality diagrams and instructions for servicing and repairing the Mercedes-Benz R129 SL-Class.
Competitive Landscape:
Competed with luxury sports convertibles such as the BMW 8 Series Convertible, Porsche 911 Cabriolet, and Jaguar XJS Convertible during its production run.
Competitive Advantage:
Comprehensive factory-level repair information enabling owners to service a complex flagship convertible without dealership dependency.
Key Benefit:
Empowers DIY enthusiasts to perform maintenance and repairs, significantly saving on dealership or independent mechanic costs.
Cost Savings Potential:
Significant savings on technical and maintenance costs for the vehicle owner by enabling DIY repairs and informed service decisions.
Coverage Areas:
Traction Control, Climate Control, Transmission, Special Tools, Electrical Systems, Chassis, Engine, Bodywork
Manual Type:
Service and Repair Manual
Delivery Method:
Instant Digital Download
Compatibility:
All versions of Windows and Mac, iPhone, iPod, Android, tablets
Software Requirements:
Adobe PDF Reader or Web HTML Viewer
Printability:
Printable pages
Access Method:
Instant download available immediately after secure payment, eliminating shipping delays and costs.
Engine Mechanical:
M104, M119, M120 engine variants
Engine Management:
Fuel injection and ignition systems
Transmission:
5-speed automatic 722.3, 722.5, 722.6
Suspension:
Front independent, rear multi-link
Brakes:
ABS, power assist
Climate Control:
Automatic climate control
Electrical System:
Wiring diagrams, component location, diagnosis
Body:
Interior trim, exterior panels, convertible top mechanism
Traction Control:
ASR/ETS
Safety Systems:
Airbags, seatbelts
Maintenance:
Routine maintenance and scheduled servicing
Diagnostics:
Troubleshooting faults, component diagnosis, electrical system diagnostics
Repairs:
Step-by-step repair procedures and overhaul instructions
Systems Servicing:
Climate control system servicing, convertible top operation and repair
Reference Data:
Special tool usage, torque specifications, fluid capacities and specifications
Depth:
Comprehensive: from basic adjustments and fluid changes to complete engine and transmission overhauls, detailed diagnostic flowcharts, and component-level repair instructions.
Special Tools Coverage:
Details specific Mercedes-Benz or aftermarket tools required for procedures such as engine timing tools, suspension compressors, or diagnostic adapters.
Body And Trim Repair:
Repair and adjustment procedures for exterior body panels, bumpers, door mechanisms, locks, and interior trim components.
Wiring Diagrams Scope:
Comprehensive wiring diagrams covering engine management, lighting, power windows, seats, climate control, and the convertible top system.
Engine Rebuild Procedures:
Disassembly, inspection, component replacement (pistons, rings, bearings, valves, gaskets), and reassembly for all covered engine variants.
Diagnostic Flowcharts:
Systematic troubleshooting guides for common drivability issues, electrical faults, and system malfunctions.
Parts Information:
Torque specifications, fluid capacities, and component part references throughout.
File Format:
PDF (searchable, bookmarked, zoomable)
Compatibility:
Windows, macOS, Linux, iOS, and Android — any device with a PDF reader
Requirements:
A PDF reader application (e.g. Adobe Acrobat Reader, free)
Searchability:
Fully text searchable for fast lookup of any topic
Print Quality:
High-resolution digital pages, printable at full clarity
Binding Type:
N/A — digital download, no physical binding
Paper Type:
N/A — digital download, no physical paper
Engine Variants Covered:
6-cylinder (M104 3.0L, 3.2L), 8-cylinder (M119 4.2L, 5.0L), and 12-cylinder (M120 6.0L) engines as fitted to the R129 chassis.
Engine Codes:
Specific engine codes (e.g., M104.940, M119.960, M120.980) to ensure correct manual sections are consulted.
Horsepower And Torque:
Detailed specifications and torque figures for all covered engine variants, enabling accurate performance tuning and repair.
Fuel Delivery Systems:
Bosch KE-Jetronic and HFM/PMS fuel injection, including component testing, pressure specifications, and injector diagnostics.
Ignition And Emissions:
Spark plugs, coils, distributors for earlier models, engine sensors, and emissions control systems including catalytic converters and EGR where applicable.
Cooling System:
Radiator, water pump, thermostat, cooling fan, and associated hoses, including flushing and replacement procedures.
Standard Transmission:
4-speed automatic 722.3 on earlier models
Optional Transmission:
5-speed overdrive automatic 722.5 on earlier models; 5-speed electronic automatic 722.6 on later models
Features And Diagnostics:
Hydraulic control, torque converter operation, shift logic, diagnostic trouble codes (DTCs), and repair procedures for these automatic gearboxes.
Vehicle Body:
2-door convertible/roadster with retractable hardtop option
Wheelbase:
Approximately 2,595 mm (102.1 in) for standard R129 models
Length:
N/A - varies by model year and bumper configuration
Curb Weight:
N/A - varies by engine variant and equipment (approx. 1,800-2,180 kg range across the production run)
Active Safety Features:
Anti-lock Braking System (ABS), Acceleration Slip Regulation (ASR) or Automatic Slip Control (ASC), and potentially Electronic Stability Program (ESP) depending on model year.
Passive Safety Features:
Airbag systems, seatbelt pre-tensioners, and roll-over protection systems integrated with the windscreen frame and pop-up roll bar.
Brake System Components:
Brake calipers, rotors, pads, master cylinder, brake lines, and ABS hydraulic unit, including bleeding procedures and component testing.
Crash Test Ratings:
N/A - not specified in this service manual
Comfort Systems:
Detailed coverage of the automatic climate control system, including HVAC blower, refrigerant circuits, and cabin filters.
Power Seats:
Coverage of power seat adjustment systems
Audio System:
N/A - not specified for this model
Driver Assistance And Electronics
Electronic Systems:
Extensive coverage of the electrical architecture, including wiring diagrams, ECU identification and function, diagnostic connectors, and diagnostic tool procedures.
Convertible Top System:
Troubleshooting and repair for the electro-hydraulic system operating the power-folding soft top, including pump, cylinders, valves, and sensors.
Scheduled Maintenance:
Recommended service intervals for oil changes, filter replacements, coolant flushes, brake fluid changes, and other preventative maintenance based on mileage and time.
Engine Oil:
MB 229.1, MB 229.3 approved grades
Transmission Fluid:
ATF Dexron II/III, NAG-1 fluid depending on gearbox
Coolant:
MB 325.0 specification
Other Fluids:
Power steering fluid and differential oil specifications
Known Faults And Fixes:
Common R129 issues such as convertible top hydraulic system leaks, mass air flow sensor failures, ignition coil problems, catalytic converter issues, and suspension wear, along with diagnostic and repair steps.
Suspension And Steering Maintenance:
Inspecting and replacing shock absorbers, springs, control arms, bushings, ball joints, and steering rack or box.
Wheel And Tire Specifications:
Tire size recommendations and wheel bolt pattern specifications (e.g., 5x112mm).
Filter Part Numbers:
Oil filter, air filter, fuel filter, and cabin air filter references for various engine options.
Production Years:
1989-2001
Predecessor:
Iconic W107 SL
Key Revisions:
Significant updates throughout the production run, including engine revisions (introduction of the M119 V8 and M120 V12), styling tweaks, and upgrades to electronic systems such as convertible top operation and safety features.
Mercedes-Benz Legacy:
The R129 carries Mercedes-Benz's reputation for engineering excellence, luxury, and durability.