Market Segment:
Compact executive car, known for Mercedes-Benz's reputation for build quality and engineering in its era.
Competitors:
Competed with vehicles like the Ford Consul, Vauxhall Cresta, and potentially entry-level models from BMW and Audi, though Mercedes-Benz occupied a premium niche.
Diesel Efficiency:
The 'D' variants emphasized fuel economy and durability characteristic of Mercedes-Benz diesel engines.
Build Quality:
Renowned for robust construction, longevity, and solid engineering, a hallmark of the brand.
Design Philosophy:
Embodied a conservative yet elegant design, prioritizing function and durability over fleeting trends.
Engine And Drivetrain:
Detailed engine overhaul, fuel system (injection pump, injectors), cooling system, lubrication system, exhaust system, clutch, manual transmission, driveshaft, differential.
Chassis And Suspension:
Front and rear suspension (independent front, swing axle rear), steering system, wheel bearings, shock absorbers, springs.
Brakes:
Hydraulic drum brakes (front and rear), brake adjustments, fluid replacement, master cylinder, wheel cylinders, brake lines.
Electrical System:
Wiring diagrams, battery, charging system (generator/alternator), starter motor, ignition system (if applicable to diesel variants), lighting system, instrumentation, fuses, relays.
Body And Interior:
Body panel repair, doors, windows, locks, seat adjustments, interior trim, heating system, ventilation.
Maintenance:
Routine maintenance checks, oil changes, filter replacements, lubrication points, belt adjustments, fluid level checks.
Diagnostics And Troubleshooting:
System-specific diagnostic procedures, common fault identification, troubleshooting guides for engine performance, electrical issues, and mechanical failures.
Repair And Rebuild:
Detailed step-by-step instructions for component removal, disassembly, inspection, repair, reassembly, and installation of all major vehicle systems.
Specifications And Tolerances:
Precise technical specifications, torque values, clearances, and measurement tolerances for all serviceable components.
Depth Of Coverage:
Comprehensive, covering everything from basic preventative maintenance to full engine and transmission rebuilds, including electrical system diagnostics and bodywork.
Engine Type:
Inline 4-cylinder Diesel
Displacement:
1.8 Liters (approx. 1798 cc)
Bore X Stroke:
82.0 mm x 85.0 mm (typical for OM621)
Compression Ratio:
22.0:1 (typical for OM621)
Horsepower:
Approximately 50-55 hp @ 4000 rpm (variant dependent)
Torque:
Approximately 110-115 Nm @ 2000 rpm (variant dependent)
Fuel Injection:
Bosch inline injection pump and injectors
Cooling Method:
Water-cooled
Oil Capacity:
Approximately 5.0 Liters (with filter change)
Recommended Oil Type:
API CD or equivalent diesel engine oil (e.g., SAE 10W-30 or 10W-40 depending on climate, consult manual for specifics)
Transmission Type:
4-speed manual
Optional Transmission:
Some variants offered a 4-speed automatic transmission.
Clutch Type:
Single dry plate, hydraulically operated
Transmission Fluid:
GL-4 Hypoid Gear Oil (e.g., SAE 80W or 80W-90, consult manual for specific capacity and type)
Body Styles:
4-door Sedan (Limousine), potentially Estate/Wagon (Universal variants were common in this era for Mercedes).
Wheelbase:
Approx. 2650 mm (for W121 chassis)
Length:
Approx. 4450 mm (for W121 chassis)
Width:
Approx. 1700 mm (for W121 chassis)
Height:
Approx. 1470 mm (for W121 chassis)
Curb Weight:
Approx. 1200-1300 kg (variant dependent)
Crash Test Information:
No formal crash test ratings comparable to modern standards exist for vehicles of this era. Safety features were rudimentary by today's standards.
Active Safety Features:
Hydraulic drum brakes, direct steering.
Passive Safety Features:
Robust body structure for its time, safety-padded dashboard (optional on some models), two-point seat belts (often optional or dealer-fitted).
Infotainment System:
Basic. Typically featured an AM/FM radio, with optional cassette players becoming available in later iterations of similar models.
Driver Assistance Systems:
None by modern standards. Basic safety was the focus.
Connectivity Features:
No built-in connectivity features.
Oil Change Interval:
Typically every 5,000 - 7,500 km or 6 months (refer to manual for precise recommendation).
Air Filter Replacement:
Every 10,000 - 15,000 km or as needed based on operating conditions.
Fuel Filter Replacement:
Every 15,000 - 20,000 km or when experiencing starting or running issues.
Coolant Type:
Ethylene Glycol based coolant, typically a 50/50 mix with distilled water. (Consult manual for specific Mercedes-Benz approved coolant).
Brake Fluid Type:
DOT 3 or DOT 4 brake fluid (consult manual for exact specification).
Common Wear Items:
Front suspension bushings, ball joints, tie rod ends, clutch wear, exhaust system corrosion, glow plug system reliability, injection pump seals.
Diesel Specific Issues:
Glow plug failure leading to hard starting in cold weather, injector pump calibration drift, potential for carbon buildup in combustion chambers.
Example Oil Filter P/N:
Specific part numbers vary by manufacturer (e.g., Mann Filter, Mahle). Refer to manual or parts catalog for OE numbers and equivalents.
Mercedes Benz Legacy:
Mercedes-Benz has a long-standing history in pioneering automotive technology, safety, and luxury, dating back to the invention of the automobile.
Predecessors And Successors:
The 180D was part of the 'Ponton' Mercedes range (W120/W121), succeeded by models like the W110 'Fintail' series, which also featured diesel variants.
Production Period:
The W121 'Ponton' platform, which included the 180D, was produced from 1956 to 1962.
Manufacturing Locations:
Primarily manufactured in Germany.
