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1991 MERCEDES-BENZ 420SEL CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT MERCEDES-BENZ REPAIR SHOPS DON'T WANT YOU TO KNOW
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- A/C & Heater Service
- Brake Service
- Fuel Filter Replacement
- Driveline, U-Joint & CV Axles Replacement
- Starter & Alternator Replacement
- Maintenance Lamp Reset
- Radiator & Hose Replacement
- Serpentine Belt Service
Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 1991 MERCEDES-BENZ 420SEL car and truck
repair procedures including MERCEDES-BENZ engine diagrams, wiring diagrams, repair work estimating measures, technical service bulletins, auto body work
guidance, starter & alternator replacement procedures, serpentine belt replacement procedures, radiator & hose replacement procedures, tune-up &
drivability specifications, quick lube illustrations, preventive maintenance guide, engine light reset instructions, parts removal and install
procedures, fuel filter replacement directions, component location diagrams, air filter locations & replacement instructions, a/c
system specifications, and general auto service procedures. You don't have to be a car mechanic or technician to know how to fix
your MERCEDES-BENZ 420SEL automobile. Try the Automotix DIY solution today!
A/C & HEATER SERVICE PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
Electrical Symbol & Wire Color Code Identification -> Wire Color Code Identification -> Imported Vehicles
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
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BRAKE SERVICE PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
MERCEDES-BENZ -> REAR DISC BRAKE SERVICE -> 190D & E, 260E & 300CE, E & TE -> Assembly -> BRAKE CALIPER, REPLACE -> BRAKE PADS, REPLACE -> CALIPER OVERHAUL -> Disassembly -> EXCEPT 190D & E, 260E & 300CE, E & TE -> Inspection -> TEVES, BENDIX & GIRLING TYPE CALIPERS
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
BRAKE CALIPER, REPLACE
EXCEPT 190D & E, 260E & 300CE, E & TE
- Open caliper bleeder screw, and pump brake fluid from rear brake circuit.
- On 1st version (early production) vehicles or vehicles with starting torque compensation, disconnect and cap brake line from caliper assembly, Fig. .
- On 2nd version (later production) vehicles, loosen frame floor bracket brake hose from brake line. Disconnect brake line from caliper. Cap all open connections.
- On all models, loosen locking plate, if so equipped.
- Remove caliper attaching bolts.
- Reverse procedure to install, noting the following:
- Wh...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
Mercedes-Benz -> Fuel Filter Scheduled Maintenance -> 1980-02 Models w/Gasoline Engines -> Normal Service -> Severe Service
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
Normal Service
Replace e...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
CV AXLE SHAFT, Replace
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
- Raise and support vehicle, then remove wheel, Fig. .
- Remove front axle shaft attaching collar nut.
- Remove lower engine compartment cover.
- Using suitable socket, remove axle shaft from connecting flange.
- Using suitable wire, secure inner joint in compressed piston.
- Position steering wheel to right stop.
- Using suitable plastic hammer, loosen fron...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
Alternator, Replace
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
- Remove drive belt.
- Remove protective cover, as required, and disconnect electrical connectors.
- Remove ...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
Mercedes-Benz -> Anti-Lock Brake System Warning Lamp ->
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
The Anti-Lock Brake (ABS) System warning lamp, will illuminate when the ignition switch is placed in the On position to indicate the warning lamp is operational. The lamp should go off when the engine is started. If the warning lamp remains on after the engine has been started or while driving the vehicle, a fault in the ABS has been detected. While the fault is present in the ABS, the ABS is switched off. When the ABS is ...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
Radiator, Replace
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
- Remove bottom engine compartment panel.
- Drain coolant into a suitable container.
- On models with automatic transmission, remove transmission oil cooler lines.
- On all models, remove coolant hoses from radiator.
- Remove coolant overflow...
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SERPENTINE BELT SERVICE PROCEDURES FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
Serpentine Drive Belt, Replace
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
- On models equipped with viscous fan clutch, remove union nut by turning nut counterclockwise.
- On models equipped with electric fan, disconnect electrical connector at engine and air conditioning fan.
- Remove retaining pin on right and left side.
- Press together retainer clamp of radiator on right and left and release radiator bridge.
- Press clamps on right and left at sa...
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COMPONENT LOCATION DIAGRAMS FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
Component location diagrams for most 1991 MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. from 1990+.
 Behind LH Side Of I/P Diagram for 1991 MERCEDES-BENZ 420SEL 4.2 V8 GASComponents on diagram: |
 RH Front Door Diagram for 1991 MERCEDES-BENZ 420SEL 4.2 V8 GASComponents on diagram: |
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WIRING DIAGRAMS FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
OEM drawn wiring diagrams for most 1991 MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S.
 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS Wiring DiagramComponents on diagram: |
 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS Wiring DiagramComponents on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
OEM TSB listings for most 1991 MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. from 1985+.
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Document: Introduction of Improved Single-Component Windshield/Window Bonding System Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS Auto Systems: |
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Document: Instrument Cluster Oil Level Messages Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1991 MERCEDES-BENZ 420SEL AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. and Canada from 1970+.
- Brake caliper mounting bolt torque
- Brake drum runout, machining, & discard specs
- Minimum brake lining thickness.
- Brake rotor runout, parallelism, machining, discard, & finish specs
A/C SYSTEM SPECIFICATIONS: Air conditioning refrigerant capacity and type as well as lubricant capacity for most 1991 MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. and Canada from 1980+.
- Refrigerant capacity & type, compressor oil viscosity, total system oil capacity & compressor clutch gap
COOLING SYSTEM BLEED: Cooling system bleeder valve identification, bleeder type and bleed procedures for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1986+.
PREVENTIVE MAINTENANCE: Preventive maintenance recommendations and required services for most domestic and imported cars and light trucks sold in the U.S. and Canada from 1980+. Includes severe and routine service schedules
QUICK-LUBE and ILLUSTRATIONS: Fluid recommendations, capacities, drain plug torques, tire data, and severe service recommended preventive maintenance schedules. Information covers most 1991 MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. and Canada from 1980+. Engine and chassis service images.
- Automatic transmission/transaxles capacities, lubricant recommendations
- Differential/final drive capacities, lube recommendations, grades, & viscosities
- Final drive fill & drain plug torques
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Manual transmission/transaxle capacities, lube recommendations, grades, & viscosities
- Number of lubrication fittings & plugs
- Power steering, brake, & clutch fluid recommendations
- Engine oil capacities, API grade recommendations, SAE viscosity recommendations, drain plug torque
- Severe service maintenance & interval recommendations
- Tire sizes, wheel nut/bolt torque, pressures & rim sizes
- Transfer case capacities, lube recommendations, grades, & viscosities
TUNE-UP & DRIVEABILITY SPECIFICATIONS: Most tune-up specifications for most 1991 MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. and Canada from 1980+
- Airflow sensor electrical specifications
- Tensioning specifications for systems with automatic tensioners
- Barometric pressure sensor specs
- Battery group number and cranking performance
- Crankshaft & camshaft position sensor resistance
- Engine compression pressures
- Coolant temperature sensor specs
- Computer advance.
- Diesel fuel temperature sensor resistance.
- Distributor advance specifications
- Ignition pickup coil resistance
- Exhaust gas recirculation temperature sensor resistance
- Engine fastener torque values
- Firing order diagrams
- Fuel system pressures
- Generator (alternator) specs
- Intake air temperature sensor specs
- Ignition coil specifications
- Fuel injector resistance
- Engine idle speeds
- Knock sensor resistance
- Manifold absolute pressure sensor specs
- Mixture control solenoid resistance
- Voltage regulator specs
- Spark plug applications & gaps
- Starter motor electrical specs.
- Tensioning specifications for systems without automatic tensioners
- Throttle body temperature sensor resistance
- Ignition timing in degrees at rpm
- Transmission oil temperature sensor resistance
- Throttle position sensor specs
- Vacuum sensor valve specs
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