Auto Parts Search


      Over 40 million used auto parts online. Shop online for auto and truck parts and save up to 75%

MERCEDES-BENZ 420SEL CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT MERCEDES-BENZ REPAIR SHOPS DON'T WANT YOU TO KNOW

Learn how to repair a car or truck, install or remove parts, wire an engine, reset warning lights, replace fuel filter, fix auto body and more. Get Automotix DIY!

    Automotive Domain Names

    Help me findSearch

    Select Year

    1991199019891988
    19871986

    Get Full Access Automotix DIY provides automotive consumers and do it yourselfers; the most comprehensive repair information about 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!
    DIY REPAIR SAMPLES > CONTINUE EXPLORING >
    Using the Automotix DIY repair procedures will save you hundreds and even thousands of dollars! In addition, it will save you hours of touring the city searching for MERCEDES-BENZ mechanics you can trust. The Automotix DIY solution is particularly affordable. A full access to the entire DIY repair procedures and diagrams for your MERCEDES-BENZ 420SEL vehicle will cost less than a single gallon of gas. Here are some of the DIY repair tips and procedures you will find here:

    A/C & HEATER SERVICE PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Air Conditioner and Heater Service Includes module configuration procedures, general service, maintenance, automatic temperature control, compressor services, electric cooling fans, vacuum diagrams, specifications, and manual air conditioning and heater diagnostics and replacement procedures for domestic and imported MERCEDES-BENZ 420SEL cars and light trucks from 1990+

    Import Compressor Service -> Delco-Air Compressors
    Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    NOTE: For Service Procedures On Delco R4 Radial Compressor, 6 Cylinder Axial Compressors And DA-V5 Variable Displacement Compressors, Refer To in General Motors.

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL A/C & HEATER SERVICE PROCEDURES

    BRAKE SERVICE PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Includes anti-lock brakes, disc, drum, power and hydraulic brake services diagnostics and procedures for domestic and imported MERCEDES-BENZ 420SEL cars and light trucks from 1990+.

    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...

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL BRAKE SERVICE PROCEDURES

    FUEL FILTER REPLACEMENT PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Fuel filter replacement procedures with corresponding images for most domestic and imported MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. for 1980+.

    Mercedes-Benz -> Fuel Filter Scheduled Maintenance -> 1980-02 Models w/Gasoline Engines -> Normal Service -> Severe Service
    Vehicle: 1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Normal Service

    Replace e...

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL FUEL FILTER REPLACEMENT PROCEDURES

    DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Includes CV axle, universal joint, and driveline replacement, for domestic and imported MERCEDES-BENZ 420SEL cars and light trucks from 1990+.

    DRIVESHAFT, Replace
    Vehicle: 1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    • Raise vehicle and support.
    • Unscrew exhaust shielding plate.
    • On models with 4MATIC, unscrew exhaust shielding plate.
    • Lift transmission and support.
    • Unscrew hex, head screws and hex nut and remove rear engine carrier with engine mount.
    • Unscrew cross bridge.
    • On all models, loosen propeller shaft clamping nut for approx. two turns without sliding back rubber sleeve (sliding along).
    • Remove front propeller shaft from transmission. Flexible coupling remains on propeller shaft.
    • Remove front propeller shaft from transfer case.
    • Prior to sliding back propeller shaft, loosen vulcanized fitted ...

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES

    STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Includes starter and alternator replacement procedures for domestic and imported MERCEDES-BENZ 420SEL cars and light trucks from 1990+.

    Starter, Replace
    Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    • Disconnect battery ground cable from battery.
    • Remove electrical connections from...

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL STARTER & ALTERNATOR REPLACEMENT PROCEDURES

    MAINTENANCE LAMP RESET PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Maintenance lamp reset procedures with corresponding images for most domestic and imported MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. from 1990+.

    Mercedes-Benz -> Brake Pad Wear Indicator Lamp ->
    Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    The Brake Pad Wear indicator lamp should illuminate when the ignition switch is placed in the On position to indicate the warning lamp is operational. After the engine has been started, the warnin...

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL MAINTENANCE LAMP RESET PROCEDURES

    RADIATOR & HOSE REPLACEMENT PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Includes radiator, cooling and heater hose replacement procedures for domestic and imported MERCEDES-BENZ 420SEL cars and light trucks from 1990+

    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...

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL RADIATOR & HOSE REPLACEMENT PROCEDURES

    SERPENTINE BELT SERVICE PROCEDURES FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Serpentine belt replacement procedures with corresponding images for most domestic and imported MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. from 1990+.

    Serpentine Drive Belt, Replace
    Vehicle: 1990 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...

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL SERPENTINE BELT SERVICE PROCEDURES

    COMPONENT LOCATION DIAGRAMS FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    Component location diagrams for most MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. from 1990+.

    Top Front Of Engine Diagram for 1989 MERCEDES-BENZ 420SEL  4.2 V8 GASTop Front Of Engine Diagram for 1989 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Components on diagram:
  • Starting Valve
  • Connector X
  • Connector X56
  • RH Rear Of Engine Compartment Diagram for 1989 MERCEDES-BENZ 420SEL  4.2 V8 GASRH Rear Of Engine Compartment Diagram for 1989 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Components on diagram:
  • Connector X
  • Connector X132
  • Connector X35
  • CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL PARTS/COMPONENTS LOCATION DIAGRAMS!

    WIRING DIAGRAMS FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    OEM drawn wiring diagrams for most MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S.

    1990 MERCEDES-BENZ 420SEL  4.2 V8 GAS Wiring Diagram1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS Wiring Diagram

    Components on diagram:
  • Coolant Temperature Sensor
  • Temperature Switch
  • Auxiliary Fan Relay
  • Auxiliary Fan
  • Air Injection Relay
  • 1990 MERCEDES-BENZ 420SEL  4.2 V8 GAS Wiring Diagram1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS Wiring Diagram

    Components on diagram:
  • Battery
  • Ignition Switch
  • Alternator
  • Starter
  • Fuel Pump Relay
  • CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL WIRING DIAGRAMS!

    TECHNICAL SERVICE BULLETINS FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    OEM TSB listings for most MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. from 1985+.

    Document: CD CHANGER SKIPPING DURING PLAYBACK, RADIO NOT RECOGNIZING MAGAZINE INSERTION OR LOADING COMPACT DISKS FROM THE MAGAZINE / RADIO STATES "NO CD CHANGER" - REVISED
    Vehicle: 1989 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Symptoms:
  • Insufficient Performance
  • Auto Systems:
  • Entertainment: Stereo, Radio, Cassettes
  • Document: ALPINE POST-WARRANTY FACTORY DIRECT REPAIR PROGRAM - RADIO AND/OR CD CHANGERS
    Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Auto Systems:
  • Entertainment: Stereo, Radio, Cassettes
  • CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL TECHNICAL SERVICE BULLETINS!

    COMPONENT/PARTS SPECIFICATIONS FOR MERCEDES-BENZ 420SEL AUTOMOBILES

    BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 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 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 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 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

    CLICK HERE TO GET FULL ACCESS TO MERCEDES-BENZ 420SEL SPECIFICATIONS DATA!

    Shop online for auto body parts, engines, wheels, lights...

    Click here to view more details1991 Mercedes Benz 420SEL Window Regulator, Front, Driver Side.

    Source: Auto Body Parts Store

    $142.67

    Click here to view more details about 1991 Mercedes Benz 420SEL Tow Eye Cover, Driver Or Passenger Side1991 Mercedes Benz 420SEL Tow Eye Cover, Driver Or Passenger Side.

    Source: Auto Body Parts Store

    $17.55

    Click here to view more details2007 Honda Accord Sedan Aftermarket Wheel Covers, AFTERMARKET WHEEL COVERS, 15 INCH, SILVER ABS 8 DIRECTIONAL VENTS, 4 LUG COVERBOLT ON APPLICATION, , .

    Source: Wheels / Rims, Mirrors & Lights Store

    $25.45

    Click here to view more details1991 Mercedes Benz 420SEL V8, 4.2 L, 4196 CC Rebuilt Engine, Warranty: 3-Year/100,000 Mile, .

    Source: Rebuilt Engines Store

    Ad Hoc

    Click here to view more details2002 Pontiac Bonneville Used Rear Vent Window, Driver Side, L., Very Good.

    Source: Used Auto Parts Store

    $133.00

    Click here to view more details2001 Oldsmobile Aurora Used Suspension Compressor/Pump, Air Compressor Assy, 12494811, Very Good.

    Source: Used Auto Parts Store

    $169.00
    More parts
    Help me findSearch
    Auto Repair Quick Search
    Help me find
    Search DIY repair manuals by VIN...
    Vehicle Identification Number is a unique serial number used by the automotive industry to identify individual motor vehicles

    Find out what info we have for your vehicle

    Get the Complete Technical Service Bulletins!
    Get the Complete Technical Service Bulletins!Access diagrams and repair information such as wiring diagrams, diagnosis and repair charts, manufacturer service bulletins, and OEM Part numbers of your MERCEDES-BENZ 420SEL vehicle.
    Access the Complete guide!
    Need To Fix Your Car or Truck?
    Save Money With Free Car Insurance Quote
    FREE car insurance quote
    Enter Zip Code:
    GOT A WEBSITE?Make money with Automotix

    Make money with Automotix Partner Program.

    Learn more

    Auto Repair Quick Search
    Help me find