Target Audience:
Owners, independent repair shops, Mercedes-Benz enthusiasts
Model Reputation:
Known for durability, comfort, and strong diesel performance
Manual Benefit:
Empowers users with detailed technical knowledge for DIY maintenance and repair
Engine:
Detailed overhaul, troubleshooting, component testing for OM617 diesel engine
Fuel System:
Diesel injection system, glow plugs, fuel filters, pumps, lines
Transmission:
Automatic transmission (4-speed 722.3) service, diagnostics, and adjustments
Suspension:
Front and rear suspension components, shock absorbers, springs, bushings
Brakes:
Hydraulic brake system, ABS (if equipped), brake pads, rotors, lines, master cylinder
Steering:
Power steering system, steering gearbox, tie rods, steering column
Electrical System:
Wiring diagrams, starter, alternator, battery, ignition, lighting, auxiliary systems
Climate Control:
HVAC system, AC compressor, refrigerant, heater core, climate controls
Body And Frame:
Body panel repair, door mechanisms, glass, interior trim, chassis components
Maintenance:
Scheduled maintenance, oil changes, filter replacements, fluid checks
Troubleshooting:
Diagnostic flowcharts, common problems and solutions for all systems
Repair:
Step-by-step repair instructions for all major vehicle components
Diagnostics:
Component testing, fault code interpretation (where applicable), electrical diagnostics
Rebuilds:
Engine and transmission component rebuild procedures, torque specifications
Torque Specifications:
Detailed torque values for all critical fasteners during assembly and disassembly
Depth:
Comprehensive, covering basic maintenance to full engine/transmission rebuilds
Diagnostics Tools:
Information on using specialized Mercedes-Benz diagnostic tools and procedures for the OM617 engine
Engine Type:
Inline 5-Cylinder Turbocharged Diesel
Displacement:
3.0 Liters (2998 cc)
Horsepower:
125 hp @ 4350 rpm (approx.)
Torque:
180 lb-ft @ 2400 rpm (approx.)
Injection Type:
Bosch Inline Injection Pump
Oil Type:
API CD or CE Specification Diesel Engine Oil (e.g., 15W-40)
Coolant Type:
Mercedes-Benz Specification 302.0 Coolant (or equivalent G05/G48 based)
Radio:
Analog or early digital AM/FM radio with cassette player
Climate Control:
Manual or optional fully automatic climate control (ECC)
Cruise Control:
Standard feature
Power Features:
Power windows, power locks, power mirrors, power antenna
Antennas:
Power-operated antenna for radio reception
Oil Change Interval:
Every 3,000-5,000 miles or 6 months (recommended)
Air Filter Replacement:
Every 15,000-20,000 miles
Fuel Filter Replacement:
Every 10,000-15,000 miles
Engine Oil Capacity:
7.5 Liters (approx.) with filter
Transmission Fluid Capacity:
8 Liters (approx. for dry fill)
Coolant Capacity:
11 Liters (approx.)
Diesel Injection Pump:
Potential for wear and leaks, requiring specialized service
Vacuum System:
Leaky vacuum lines can affect central locking, climate control, and engine performance
Rust:
Prone to rust in typical areas: wheel wells, rocker panels, around windows
Oil Cooler Seals:
Can develop leaks over time
Manufacturer:
Mercedes-Benz AG (Daimler-Benz AG)
W126 Generation:
Second generation S-Class, introduced 1979
300Sd Introduction:
Introduced to North American market in 1978, popular for its fuel efficiency and durability
Production Years:
1978-1985 (for W116/W126 300SD)
Manufacturing Location:
Germany
