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MERCEDES-BENZ 420SEL CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT MERCEDES-BENZ REPAIR SHOPS DON'T WANT YOU TO KNOW
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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!
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+
Imported Cars & Light Trucks & Vans -> 1991-92 -> Evacuating System
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
The system must be completely discharged before evacuation. After discharging the system, keep low pressure gauge hose connected to low pressure test fitting and both manifold gauge valves closed.
- Connect high pressure gauge hose to vacuum pump, Fig. .
- Connect center manifold gauge hose to refrigerant source with tapping valve closed.
- Open high and low side gauge valves with vacuum pump operating.
- Continue to operate pump for approximately 15-20 minutes after low side gauge reaches 29 or more inches of vacuum. If the system has been left open for an...
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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 -> FRONT DISC BRAKE SERVICE -> 190D & E, 260E & 300CE, E & TE -> 560SL -> Assembly -> BRAKE CALIPER, REPLACE -> BRAKE PADS, REPLACE -> CALIPER OVERHAUL -> Disassembly -> EXCEPT 190D & E, 260E & 300CE, E & TE -> EXCEPT 560SL -> Inspection -> Installation -> Removal
Vehicle: 1991 MERCEDES-BENZ 420SEL 4.2 V8 GAS
BRAKE CALIPER, REPLACE
EXCEPT 190D & E, 260E & 300CE, E & TE
Removal
On 300SE, SEL, 420SEL and 560SEC and SEL series vehicles using Girling type brake calipers, refer to 190D and E Series removal and installation procedures.
- Raise and support vehicle.
- Remove tire and wheel assembly.
- Open brake caliper bleeder screw, then pump brake fluid out of front brake circuit.
- Disconnect and cap brake hose from brake line.
- On vehicles with wear indicator, pull clip sensor cables out of caliper plug connector.
- On all models, remove brake lining wear indicator plug connector and brake hose fr...
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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...
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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+.
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 MERCEDES-BENZ 420SEL AUTOMOBILES
Includes starter and alternator replacement procedures for domestic and imported MERCEDES-BENZ 420SEL cars and light trucks from 1990+.
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 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: 1990 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...
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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+
Heater Hose, Replace -> Inlet -> Outlet
Vehicle: 1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS
Inlet
- Drain coolant into a suitable container.
- Reposition clamp on heat exchanger feed pipe and remove hose.
- Reposition clamp on engine and remove hose.
- Remove hose from vehicle.
- Reverse procedure to...
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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: 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 MERCEDES-BENZ 420SEL AUTOMOBILES
Component location diagrams for most MERCEDES-BENZ 420SEL cars and light trucks sold in the U.S. from 1990+.
 Center Of Windshield Header Diagram for 1990 MERCEDES-BENZ 420SEL 4.2 V8 GASComponents on diagram: |
 LH Front Of Engine Compartment Diagram for 1989 MERCEDES-BENZ 420SEL 4.2 V8 GASComponents on diagram: |
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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 DiagramComponents on diagram: |
 1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS Wiring DiagramComponents on diagram: |
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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+.
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Document: RADIAL CRACK IN LIGHT ALLOY DISK WHEEL Vehicle: 1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS Auto Systems: |
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Document: MBUSA APPROVED REFINISHING PRODUCTS Vehicle: 1990 MERCEDES-BENZ 420SEL 4.2 V8 GAS Auto Systems: |
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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
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