Target Audience:
Mercedes-Benz W124 owners, independent repair shops, and automotive technicians seeking in-depth repair and maintenance information.
Value Proposition:
Provides a comprehensive, factory-level resource for maintaining and repairing the specified W124 models, offering significant cost savings over dealership service.
Feature Set:
Extensive coverage of mechanical, electrical, and body systems, detailed illustrations, torque specifications, diagnostic procedures, and factory maintenance schedules.
Engine:
Engine Overhaul and Rebuilding, Engine Performance Tuning, Firing Orders, Serpentine Belt Routings and Service, Timing Belt Replacement Procedures
Brakes:
Complete Brake System Service and Repair
Body And Chassis:
Sunroof Service, Front End Procedures and Specifications, Suspension System Service, U-Joint and CV-Joint Service Procedures
Electrical And Electronics:
Wiring Diagrams, Computer Diagnostic Codes, Trouble Codes, Troubleshooting and Diagnostics
HVAC:
Air Conditioning Service and Capacities
Powertrain:
Transmission Information, Transmission Service and Rebuild
Maintenance:
Factory Maintenance Schedules and Charts, Fluid Specifications and Capacities, Routine Service Procedures
Repair:
Detailed Repair Procedures for all covered systems, Engine Rebuilding, Transmission Overhauls, Brake System Repairs, Suspension Component Replacement
Diagnostics:
Troubleshooting Guides, Diagnostic Code Interpretation, Component Testing Procedures
Depth:
Comprehensive, covering everything from basic maintenance to complete engine and transmission overhauls, suitable for professional mechanics and advanced DIY enthusiasts.
Engine Code 300Ce:
M104.980 (3.0L Inline-6, 24-valve DOHC)
Engine Code 300E:
M104.980 (3.0L Inline-6, 24-valve DOHC) or M103.983 (3.0L Inline-6, 12-valve SOHC) for earlier 300E models, though the manual specifies 1993-1995 which predominantly features the M104.
Horsepower 300Ce M104:
Approximately 217 hp (162 kW) @ 6400 rpm (figures may vary slightly by market and specific year)
Torque 300Ce M104:
Approximately 207 lb-ft (280 Nm) @ 4400 rpm (figures may vary slightly by market and specific year)
Fuel Injection System:
Bosch KE-Jetronic (M103) or Bosch HFM/PMS (M104) Electronic Fuel Injection with Lambda control
Timing Belt Or Chain M104:
Timing Chain (maintenance-free under normal conditions, but inspection for wear is covered).
Timing Belt Or Chain M103:
Timing Belt (requires periodic replacement; intervals covered).
Bore Stroke M104:
89.9 mm x 78.4 mm
Compression Ratio M104:
10.0:1
Valve Configuration M104:
DOHC, 4 valves per cylinder
Transmission Type 300Ce:
4-speed Automatic (722.4) or 5-speed Manual (G45-5)
Transmission Type 300E:
4-speed Automatic (722.4) or 5-speed Manual (G45-5)
Electronic Control Automatic:
Some later models may feature electronically controlled automatic transmissions (e.g., 722.6, though less common on the specific models listed for 1990-1995).
Automatic Transmission Fluid Type:
MB 236.1, MB 236.2, or MB 236.7 (check specific vehicle for exact specification)
Manual Transmission Fluid Type:
MB 235.1 (GL-4)
Automatic Transmission Fluid Capacity:
Approx. 7-9 liters (depending on torque converter drain)
Manual Transmission Fluid Capacity:
Approx. 1.5-2.0 liters
Crash Test Ratings:
While formal crash test ratings from entities like NHTSA or IIHS for this era may be limited or unavailable in a standardized format, the W124 chassis was renowned for its robust build quality and excellent passive safety features for its time, including crumple zones and reinforced passenger cell.
ABS:
Standard on most models within this timeframe.
Airbags:
Driver's airbag became standard on many models in the early 1990s. Passenger airbags were optional or introduced later.
Seatbelts:
Pretensioner seatbelts for front occupants.
Oil Change Interval:
Typically every 10,000-15,000 km (6,000-9,000 miles) or annually, depending on driving conditions and oil type used. Specific intervals are detailed in the manual.
Transmission Service Interval:
Automatic transmission fluid and filter change typically recommended every 50,000-80,000 km (30,000-50,000 miles).
Spark Plug Replacement:
Depends on plug type; typically 30,000-60,000 km for standard plugs, and significantly longer for platinum or iridium plugs.
Engine Oil Specification:
MB 229.1 or MB 229.3 compliant synthetic or semi-synthetic oils, typically SAE 0W-40, 5W-40, 10W-40, or 15W-40 depending on climate. Specific viscosity grade is crucial and detailed in the manual.
Coolant Specification:
MB 325.0 (Glysantin G48) or equivalent ethylene glycol-based coolant with corrosion inhibitors. Specific ratio for mixing with distilled water is provided.
Brake Fluid Specification:
DOT 3 or DOT 4 (non-silicone based). Regular flushing and replacement are recommended.
Wiring Harness:
Degradation of the main engine wiring harness insulation (especially the Motronic harness) is a common issue due to age and material breakdown.
Head Gasket:
While generally robust, head gasket issues can occur, particularly with higher mileage or overheated engines.
Sun Roof Leaks:
Drain channels for the sunroof can become blocked, leading to water ingress into the cabin.
Climate Control:
Vacuum leaks affecting the HVAC system's ability to control airflow direction are common.
Suspension Components:
Wear on control arm bushings, ball joints, and shock absorbers is typical with age and mileage.
Mercedes Benz Legacy:
Mercedes-Benz has a long-standing reputation for engineering excellence, safety, and durability, often referred to as 'over-engineered'.
W124 Introduction:
The W124, launched in 1984, succeeded the W123 and was produced until 1995. It was marketed as the 'E-Class' from 1993 onwards. It was celebrated for its build quality, ride comfort, and sophisticated design.
Mid Cycle Updates:
The W124 received a significant facelift in 1993, introducing the 'E-Class' nomenclature and updated styling elements, including smoother body lines and integrated bumpers. Engine options also evolved during its production run.
Production Period Covered:
1990-1995 for the specific models listed.
Manufacturing Locations:
Primarily Germany, with some assembly in other international locations.
