Segment:
Compact Executive Sedan / Coupe (the 'Baby Benz').
Target Audience:
Entry-level luxury buyers, those seeking Mercedes-Benz quality and engineering in a smaller package.
Primary Competitors:
BMW 3 Series (E30), Audi 80/90, Alfa Romeo 75, Saab 900.
Engineering Philosophy:
Built to Mercedes-Benz's renowned standards for durability, safety, and engineering excellence, even in a more compact and affordable segment.
Design Influence:
Penned by Bruno Sacco, it established a new design language for Mercedes-Benz, influencing future models.
Engine:
Detailed diagnostics, repair, overhaul procedures for all engine variants (diesel and potentially gasoline if SL designation implies it).
Engine Management:
Fuel injection systems (Bosch VE for diesels, potentially K-Jetronic/KE-Jetronic for gasoline), ignition systems (if applicable), emissions control systems.
Transmission:
Manual and automatic transmission repair, clutch service, torque converter, internal component overhauls, shift linkage adjustments.
Drivetrain:
Differential, driveshafts, CV joints, axle shafts, wheel bearings.
Suspension:
Front and rear suspension components, shock absorbers, springs, control arms, bushings, alignment specifications.
Steering:
Power steering system, steering rack, tie rods, steering column, hydraulic pump.
Brakes:
Hydraulic brake system, front/rear disc brake service, ABS system diagnostics (if equipped), brake fluid specifications, bleeding procedures.
Electrical:
Wiring diagrams, starter, alternator, battery, lighting systems, fuses, relays, instrument cluster, power accessories.
Body:
Body panel removal/installation, doors, windows, locks, hinges, interior trim, exterior trim, glass replacement.
HVAC:
Heating, ventilation, and air conditioning system service, refrigerant handling, compressor, blower motor, heater core.
Fuel System:
Fuel tank, fuel lines, fuel pump, fuel filter replacement.
Cooling System:
Radiator, water pump, thermostat, coolant hoses, fan assembly, coolant specifications.
Maintenance:
Routine maintenance procedures, oil changes, filter replacements, fluid checks, spark plug replacement (if applicable).
Troubleshooting:
Diagnostic flowcharts, common problem identification, symptom-based troubleshooting guides.
Repair:
Step-by-step repair instructions for all major mechanical and electrical components.
Overhaul:
Complete engine, transmission, and differential overhaul procedures.
Specifications Data:
Torque specifications, clearances, fluid capacities, electrical resistance values.
Special Tools:
Identification of required special tools for specific repair procedures.
Depth:
Comprehensive, from basic maintenance to full engine rebuilds and complex electrical diagnostics.
190D/Db Engine:
OM601 I4 Diesel (2.0L/2.3L depending on variant)
190Sl Engine:
Likely a gasoline engine, potentially M102 2.3L inline-4 or similar, depending on specific SL designation which might be a performance variant.
190D Power:
Approx. 72-90 hp (depending on variant and market).
190D Torque:
Approx. 100-130 lb-ft (depending on variant and market).
Diesel Fuel System:
Bosch mechanically controlled inline injection pump (VE type).
Gasoline Fuel System:
Likely Bosch K-Jetronic or KE-Jetronic fuel injection.
Oil Change Interval:
Typically every 7,500 - 10,000 miles (12,000 - 16,000 km) or 12 months, whichever comes first (using appropriate oil).
Diesel Maintenance Items:
Fuel filter replacement (critical for diesel longevity), glow plug checks, injection pump timing.
Engine Oil Diesel:
API CD/CE or ACEA E1/E2 specification diesel engine oil, viscosity typically 15W-40 or 10W-40 depending on climate. Consult specific manual for exact MB-approval.
Coolant:
Mercedes-Benz approved coolant (e.g., G48 or similar ethylene glycol based) mixed with distilled water 50/50.
Brake Fluid:
DOT 3 or DOT 4 brake fluid (refer to manual for specific MB approval).
Common Diesel Issues:
Injector seal leaks, vacuum line deterioration, glow plug failure, overheating due to clogged radiators/heater cores, injector pump timing drift.
Common Gasoline Issues:
Head gasket leaks (M102), fuel distributor issues (K-Jetronic), vacuum leaks, timing chain stretch.
Suspension Issues:
Worn control arm bushings, ball joints, and tie rod ends, leading to imprecise steering and tire wear.
Electrical Issues:
Corrosion on wiring connectors, failing vacuum operated door locks (central locking), brittle wiring insulation.
