Segment:
Compact Executive Sedan
Introduction Era:
Launched in 1982, it represented Mercedes-Benz's entry into the compact executive segment, aiming for a younger demographic and a more accessible price point than their larger models.
Competitors:
BMW 3 Series (E30), Audi 80/90, Volvo 240/740, Volkswagen Passat.
Engineering:
Known for Mercedes-Benz's signature build quality, safety features, and durable engineering, particularly the robust diesel engines.
Design:
Designed by Bruno Sacco, it featured a more modern and angular design compared to previous Mercedes models, establishing a new design language for the brand.
Engine:
Detailed repair and overhaul procedures for Diesel engines (e.g., OM601, OM602 variants), including fuel injection systems, lubrication, cooling, and emissions.
Transmission:
Coverage of manual and automatic transmissions, including clutch, gearbox, torque converter, and driveline components.
Brakes:
Diagnosis, repair, and service for hydraulic brake systems, including ABS (where applicable), calipers, master cylinder, and lines.
Suspension Steering:
Front and rear suspension components (e.g., MacPherson struts, multi-link rear), steering system, power steering, and alignment specifications.
Electrical System:
Comprehensive wiring diagrams, troubleshooting for lighting, ignition, charging system, starter, instrumentation, power windows, central locking, and HVAC controls.
Body Chassis:
Bodywork repair, panel replacement, doors, windows, interior trim, and chassis component adjustments.
Fuel System Diesel:
In-depth coverage of diesel injection systems, including pump timing, injector testing, and pressure adjustments.
Maintenance:
Scheduled maintenance tasks, fluid changes, filter replacements, belt inspections, and lubrication points.
Troubleshooting:
Diagnostic flowcharts and symptom-based troubleshooting guides for common issues.
Repair:
Step-by-step repair instructions for virtually all mechanical and electrical components.
Diagnostics:
Detailed procedures for diagnosing faults using specialized tools and visual inspection.
Engine Timing:
Detailed procedures for setting ignition timing (petrol) and injection pump timing (diesel) using specific tools.
Valve Adjustment:
Procedures for adjusting valve clearances on applicable engine variants.
Depth:
Comprehensive, covering everything from routine maintenance to complete engine and transmission overhauls, including specific torque values, clearances, and timing procedures.
Torque Specifications:
Precise torque values for all critical fasteners, including cylinder head bolts, main bearings, and suspension components.
Electrical Diagnostics:
Detailed troubleshooting trees, component testing, and wiring schematic interpretation for electrical faults.
Engine Type 190D:
OM601 naturally aspirated diesel (e.g., 2.0L, 2.2L)
Engine Type 190Db:
OM602 naturally aspirated or turbocharged diesel (e.g., 2.5L, 2.5L Turbo)
Engine Type 190Sl:
M102 inline-4 petrol engine (e.g., 2.3L, 2.6L - Note: The 'SL' designation in the manual title might be a slight misnomer for the petrol variants of the W201, as 'SL' traditionally denotes a roadster. It likely refers to the petrol-powered 190E models.)
Horsepower Range Diesel:
Approximately 70-94 hp for naturally aspirated diesel, 90-125 hp for turbocharged diesel.
Horsepower Range Petrol:
Approximately 110-130 hp for 2.3L petrol variants.
Torque Diesel:
Diesel variants were known for strong low-end torque, crucial for their utilitarian nature.
Diesel Fuel System:
Bosch inline injection pumps or rotary pumps, mechanical injectors.
Petrol Fuel System:
Fuel injection (e.g., K-Jetronic, KE-Jetronic).
Crash Safety Reputation:
High for its era, with strong unibody construction and crumple zones.
ABS:
Optional on many models, standard on some later variants.
Airbags:
Driver airbag became optional and later standard on some models towards the end of its production run.
Seatbelts:
Pre-tensioner seatbelts were introduced.
Audio System:
Original units typically featured basic AM/FM radio with cassette players; upgrades to modern head units are common.
ABS:
As mentioned, ABS was an option, representing advanced safety tech for its time.
Early Features:
Features like central locking, power windows, and electrically adjustable mirrors were available as options, signaling a move towards convenience.
Oil Change Interval:
Typically every 7,500 - 15,000 km or 6-12 months, depending on driving conditions and oil type used (refer to manual for specifics).
Major Service Points:
Includes replacement of fuel filters, air filters, coolant, brake fluid, and transmission fluid at specified intervals (e.g., 40,000-80,000 km).
Engine Oil Spec:
Refer to manual for specific viscosity (e.g., 15W-40, 10W-40 for diesel) and API/ACEA ratings. MB 227.1 or 228.1 for diesel often applicable.
Coolant Spec:
MB-approved silicate-free coolant (e.g., G48, or equivalent based on era).
Brake Fluid Spec:
DOT 3 or DOT 4.
Transmission Fluid Auto:
MB 236.1 or 236.2 (e.g., ATF Dexron II).
Wiring Harness:
Degradation of insulation on certain wiring harnesses, particularly in the engine bay, can lead to electrical faults.
Rust Corrosion:
Common for vehicles of this age; rust can affect wheel arches, door bottoms, and underbody components. Proper undercoating and rust prevention are key.
Diesel Pre Chamber Glow Plugs:
Glow plug failure can lead to hard starting in cold weather. Pre-chambers themselves can crack or leak if not properly maintained.
Oil Leaks:
Valve cover gaskets, oil pan gaskets, and crankshaft seals are common sources of oil leaks.
Suspension Wear:
Ball joints, control arm bushings, and shock absorbers are wear items that require periodic replacement.
Mercedes Benz Legacy:
Established in pioneering automotive engineering, luxury, and safety since the late 19th century.
W201 Development:
Developed as a more compact and fuel-efficient alternative to the W123/W124, broadening Mercedes-Benz's market appeal.
Production Run:
Produced from 1982 to 1993.
Production Volume:
Over 1.8 million units were produced globally, making it a significant volume seller for Mercedes-Benz.
