Target Audience:
Mechanical technicians, Mercedes-Benz enthusiasts, owners performing their own maintenance and repairs.
Special Emphasis:
Highlights specific product aspects, special tools, and safety precautions (WARNING, CAUTION, NOTE).
Value Proposition:
Enables owners to be better informed and perform repairs knowledgeably, saving on dealer costs and maintaining vehicle quality.
Content Origin:
Reflects information available in authorized Mercedes-Benz dealer service departments at the time of publication.
Engine:
Engine mechanical, fuel system, ignition system, cooling system, lubrication system, exhaust system.
Transmission:
Manual and automatic transmission overhaul, removal, and installation.
Drivetrain:
Driveshafts, differentials, axles.
Suspension:
Front and rear suspension components, steering system.
Brakes:
Brake system hydraulics, disc and drum brake overhaul, parking brake.
Electrical:
Wiring diagrams, starter, alternator, battery, lighting, instrumentation, ignition switch, power windows, central locking (if equipped).
Bodywork:
Body panel removal and installation, doors, windows, bumpers, interior trim, body sealant and rustproofing.
HVAC:
Heating, ventilation, and air conditioning system (if equipped).
Maintenance:
Routine service, lubrication, fluid changes, filter replacements, tune-ups.
Troubleshooting:
Diagnostic procedures for common faults and symptoms.
Repair:
Detailed repair and overhaul instructions for all major components.
Installation:
Component removal and installation procedures.
Assembly:
Component assembly and disassembly instructions.
Depth:
Comprehensive, covering from basic maintenance to complete engine and transmission rebuilds, intended for professional technicians but accessible to experienced DIY enthusiasts.
Engine Type:
Inline 6-cylinder, SOHC (Single Overhead Camshaft)
Engine Code:
M110 (typically)
Displacement:
2.8 Liters (2778 cc)
Horsepower:
Approximately 136-142 hp (DIN) depending on specific market and emission controls.
Torque:
Approximately 230-235 Nm (170-174 lb-ft) at around 3000-3500 rpm.
Fuel Delivery:
Bosch D-Jetronic Fuel Injection (or Weber carburetors on some earlier or specific market models, though D-Jetronic is more common for this period and model designation).
Fuel Type:
Unleaded gasoline (91 AKI or higher recommended, lead substitute may be required for earlier engines not designed for unleaded fuel).
Oil Type:
API SG or higher, SAE 10W-40 or 10W-50 recommended, consult specific manual for precise OEM specification (e.g., MB 229.1).
Coolant Type:
Ethylene glycol-based coolant with corrosion inhibitors, typically a 50/50 mix with distilled water.
Transmission Type:
4-speed manual transmission (typically).
Transmission Type:
3-speed automatic transmission (optional, typically a "3G-Tronic" or 722.1 variant).
Automatic Features:
Torque converter, hydraulic control unit.
Automatic Transmission Fluid:
MB 236.2 (Dexron II or equivalent).
Length:
Approximately 4,960 mm (195.3 in)
Width:
Approximately 1,790 mm (70.5 in)
Height:
Approximately 1,420 mm (55.9 in)
Curb Weight:
Approximately 1,600 - 1,700 kg (3,527 - 3,748 lbs)
Gross Vehicle Weight:
Approximately 2,150 kg (4,740 lbs)
Crash Test Ratings:
As this vehicle predates modern standardized crash testing (e.g., NHTSA), specific ratings are not directly applicable. However, the W116 was designed with advanced safety features for its era, including a strong safety cell and impact-absorbing zones.
Brakes:
Four-wheel disc brakes (solid front, solid or ventilated rear depending on spec), often with power assistance.
Steering Column:
Collapsible steering column.
Interior:
Impact-absorbing dashboard and trim, padded surfaces, seatbelts (often lap and shoulder belts in the front).
Audio System:
Factory-fitted AM/FM radio, often with a cassette player. High-end systems might have integrated amplifiers.
Cruise Control:
Optional cruise control system available on some models.
Air Conditioning:
Effective climate control system, often with automatic temperature regulation (Thermatic) on higher trims.
Connectivity Features:
Limited by modern standards; primarily focused on vehicle operation and comfort features.
Oil Change Interval:
Typically every 5,000-10,000 km (3,000-6,000 miles) or 6-12 months, depending on driving conditions and oil used. Consult the manual for precise intervals.
Tune Up Interval:
Spark plugs, ignition points (if applicable), and fuel system checks usually recommended every 15,000-30,000 km (9,000-18,000 miles).
Transmission Fluid Change:
Automatic transmission fluid and filter typically every 40,000-80,000 km (25,000-50,000 miles).
Engine Oil Capacity:
Approximately 6.5 - 7.5 liters (6.9 - 7.9 US quarts) with filter, depending on engine variant. Consult the manual for the exact capacity for the M110 engine.
Coolant Capacity:
Approximately 10-12 liters (10.5-12.7 US quarts). Consult the manual for precise capacity.
Fuel Injection:
D-Jetronic system can be sensitive to age; issues with fuel pump, pressure regulator, or injectors can occur.
Cooling System:
Radiator leaks, thermostat issues, and water pump wear are common with age.
Rust:
Common rust areas include wheel arches, door bottoms, and trunk floor. Proper rustproofing and maintenance are crucial.
Electrical:
Wiring insulation can degrade over time; connectors may corrode. Issues with vacuum lines can also affect engine performance.
Brand Legacy:
Mercedes-Benz, renowned for luxury, engineering, and safety since the early 20th century.
W116 Introduction:
The W116 was introduced in 1972 as the successor to the W108/W109 S-Class. It marked a significant step forward in automotive design and technology.
W116 Positioning:
Positioned as Mercedes-Benz's flagship luxury sedan, competing with vehicles like the BMW E3 and later E23 7 Series, Jaguar XJ, and Rolls-Royce Silver Shadow.
Production Years:
1972 - 1980
Production Variants:
280 S, 280 SE, 350 SE, 350 SEL, 450 SE, 450 SEL, 450 SEL 6.9, 300 SD (diesel).
