Engine Mechanical:
Complete overhaul, diagnostics, timing, lubrication, cooling, fuel delivery, emissions control (including catalytic converters, O2 sensors, secondary air injection)
Engine Management:
ECU diagnostics, sensor testing and replacement (MAP, MAF, TPS, CKP, CMP), ignition system (coils, plugs, wiring), fuel injection systems (injectors, pressure regulators)
Transmission Automatic:
Service, repair, diagnostics, valve body, torque converter, fluid service, electronic control unit (TCU)
Transmission Manual:
Service, repair, clutch replacement, diagnostics, fluid service (if applicable to specific models covered)
Drivetrain:
Driveshafts, CV joints, differentials, propeller shafts, AWD systems (4MATIC)
Suspension:
Front and rear suspension components, springs, shock absorbers, struts, control arms, bushings, ball joints, steering knuckles, airmatic suspension system (if equipped)
Steering:
Power steering system, steering rack, power steering pump, tie rods, steering column, steering angle sensor
Brakes:
Hydraulic system (master cylinder, brake lines, calipers, wheel cylinders), ABS, ESP, brake pad and rotor replacement, brake bleeding, parking brake system
Electrical System:
Battery, alternator, starter motor, wiring diagrams, fuses, relays, lighting system (headlights, taillights, interior lights), horn
Body And Chassis:
Body panel removal and installation, door mechanisms, glass replacement, interior trim, underbody protection, chassis alignment
HVAC:
Air conditioning system (refrigerant, compressor, condenser, evaporator), heating system, climate control module, blower motor, cabin air filter replacement
Comfort And Convenience:
Power windows, power seats, remote keyless entry, sunroof operation, seat heaters/ventilators, interior lighting
Safety Systems:
Airbag system (SRS components, diagnostics, replacement), seatbelt mechanisms, crash sensor locations
Routine Maintenance:
Oil and filter changes, air filter replacement, spark plug replacement, fluid level checks and top-offs, tire rotation and pressure checks
Troubleshooting:
Step-by-step diagnostic procedures for common and complex issues, diagnostic trouble codes (DTCs) interpretation and resolution
Component Replacement:
Detailed instructions for removing, installing, and replacing all major and minor components
Rebuilding And Overhauling:
Procedures for rebuilding engines, transmissions, and other major assemblies (where applicable)
Diagnostics And Testing:
Testing procedures for electrical circuits, sensors, actuators, and mechanical components using multimeters, oscilloscopes, and specialized diagnostic tools
Depth Of Information:
Comprehensive coverage from basic maintenance to advanced diagnostics and major component overhauls
Diagnostic Charts:
Inclusion of diagnostic flowcharts and symptom-based troubleshooting guides
Wiring Diagrams:
Detailed electrical schematics for all vehicle systems, including power distribution, grounds, and component interconnections
Torque Specifications:
Precise torque values for all fasteners and critical components
Clearances And Tolerances:
Specifications for engine component clearances, bearing tolerances, and other critical measurements
Common Engines:
M271 (1.8L Supercharged I4), M272 (3.5L V6), M112 (2.6L/3.2L V6 - earlier models), M113 (4.3L/5.0L V8), OM646/OM647/OM648 (2.2L/2.7L/3.2L Diesel I4/I5)
E320 2003 Specs:
3.2L V6 (M112), ~221 hp @ 6000 rpm, ~232 lb-ft @ 3000 rpm
E500 2004 Specs:
5.0L V8 (M113), ~302 hp @ 5600 rpm, ~339 lb-ft @ 2700 rpm
E350 2006 Specs:
3.5L V6 (M272), ~268 hp @ 6000 rpm, ~258 lb-ft @ 3500 rpm
E320 Cdi 2005 Specs:
3.2L Diesel I4 (OM646), ~201 hp @ 4200 rpm, ~369 lb-ft @ 1800 rpm
Injection Type:
Sequential Multi-Port Fuel Injection (MPI) for gasoline, Common Rail Direct Injection (CDI) for diesel
Fuel Grade Gasoline:
Premium Unleaded Gasoline (91 octane or higher recommended)
Fuel Grade Diesel:
Low-Sulfur Diesel Fuel
Oil Change Interval:
Typically every 10,000 miles or 1 year, or as indicated by the Flexible Service System (FSS) based on driving conditions.
Major Service Points:
Spark plug replacement around 60,000-100,000 miles (depending on type), transmission fluid service typically around 40,000-60,000 miles, coolant flush around 30,000-50,000 miles.
Engine Oil Type:
MB 229.5 (for gasoline engines, e.g., Mobil 1 0W-40 or equivalent). Specific viscosity and specification depend on engine type and climate. Always consult manual.
Coolant Type:
Mercedes-Benz approved coolant (e.g., G48 or similar ethylene glycol based) mixed with distilled water in a 50/50 ratio.
Brake Fluid Type:
DOT 4 PLUS (or MB specification 331.0)
Engine M271 Timing Chain:
Potential for timing chain stretch and tensioner failure, leading to rough running and potential engine damage. Early detection and replacement are crucial.
M272 Balance Shaft Gear:
In later models (e.g., 2006+), the balance shaft gear in the M272 engine can wear prematurely, causing check engine lights and rough idle. Requires engine disassembly for replacement.
Airmatic Suspension:
Air springs and compressor can be sources of leaks and failure, leading to sagging suspension. Diagnostics are key.
Electronics Module Failures:
Occasional failure of various electronic control units (e.g., SAM modules, transmission control units) can occur due to water intrusion or component failure.
Rust And Corrosion:
While generally well-built, some areas are prone to rust, especially in regions with harsh winters or salt exposure. Key areas include wheel arches, sills, and rear subframes.
