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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!

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    1991199019891988
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    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+

    Mercedes-Benz -> Component Replacement & Adjustment -> EVAPORATOR TEMPERATURE SENSOR, REPLACE
    Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    • Remove drivers side instrument panel undercover.
    • Loosen cable stra...

    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, ANTI-LOCK BRAKE SYSTEMS -> TROUBLESHOOTING
    Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Refer to Fig. , for tr...

    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: 1991 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: 1991 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 -> Anti-Lock Brake System Warning Lamp ->
    Vehicle: 1990 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 ...

    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: 1990 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+.

    RH Front Footwell Diagram for 1991 MERCEDES-BENZ 420SEL  4.2 V8 GASRH Front Footwell Diagram for 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Components on diagram:
  • Blower Motor
  • CIS-E Control Unit
  • Connector X-36
  • Connector X-42
  • ASD Components Diagram for 1991 MERCEDES-BENZ 420SEL  4.2 V8 GASASD Components Diagram for 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Components on diagram:
  • Stop Lamp Switch
  • Front Wheel Speed Sensors
  • Overvoltage Protection Relay
  • ASD Control Unit
  • Hydraulic Pump
  • 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:
  • Radio
  • LH Rear Speaker
  • LH Front Speaker
  • RH Rear Speaker
  • RH Front Speaker
  • 1991 MERCEDES-BENZ 420SEL  4.2 V8 GAS Wiring Diagram1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS Wiring Diagram

    Components on diagram:
  • Idle Speed Control
  • Fuel Pump Relay
  • Diagnostic Connector
  • Overvoltage Protection 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: TECHNICAL INFORMATION UPDATE ANNOUNCEMENT - RADIO CODING GUIDE
    Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Auto Systems:
  • Labor Times, Manuals, Warranty, Aids
  • Document: PAINT REPAIRS
    Vehicle: 1988 MERCEDES-BENZ 420SEL 4.2 V8 GAS

    Auto Systems:
  • Finishes, Body Structure, Frame, Bumpers
  • 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 details1990 Mercedes Benz 420SEL Starter, 10-tooth pinion; 1.7 kilowatts; 12 volts; PMGR design; Clockwise rotation; Manufactured to the strictest OE standards; Built from 100 percent new components to ensure reliable operation; With 2 years limited TrustBuilt warranty..

    Source: Auto Body Parts Store

    $119.97

    Click here to view more details1991 Mercedes Benz 420SEL Window Switch, Driver Side, 1-button; A high quality, direct fit OE replacement window switch; With 1-year limited TruckEFX warranty..

    Source: Auto Body Parts Store

    $15.93

    Click here to view more details2008 Lexus IS250 17" X 4" Steel Wheel, STEEL WHEEL, 17 X 4, 5 STUDS/LUGS, 4.5" BOLT DIA, SPARE, BLACK , , .

    Source: Wheels / Rims, Mirrors & Lights Store

    $65.13

    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

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    Click here to view more details2007 Dodge Nitro Used Cargo Cover, Black, Good.

    Source: Used Auto Parts Store

    $267.00

    Click here to view more details2001 Audi A6 Used Suspension Compressor/Pump, air ride compressor (ID 4Z7616007A), Very Good.

    Source: Used Auto Parts Store

    $508.00
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