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1991 MERCEDES-BENZ 300SL CAR/TRUCK REPAIR PROCEDURES AND DIAGRAMS - WHAT MERCEDES-BENZ REPAIR SHOPS DON'T WANT YOU TO KNOW
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- Component Locations
- Wiring Diagrams
- Technical Service Bulletins
- Specifications
- 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

A/C & HEATER SERVICE PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
Serpentine Drive Belt Routing -> Imported Passenger Cars, Light Trucks & Vans -> Mercedes-Benz
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS
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BRAKE SERVICE PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
MERCEDES-BENZ, HYDRAULIC BRAKE SYSTEMS -> HYDRAULIC BRAKE SYSTEMS -> MASTER CYLINDER REPLACEMENT
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS
On Vehicles Equipped With Anti-Lock Brakes Refer To "Anti-Lock Brake Systems."
- Drain fluid from front and rear brakes.
- Using a suitable screwdriver, lift tangs on warning switch, and disconnect electrical connector.
- Disconnect and cap brake lin...
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FUEL FILTER REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
Mercedes-Benz -> Fuel Filter Replacement -> Except 2003-06 E320 & E500 Sedans Less 4 Matic & 2004-06 E Series w/Gasoline Engines -> Fuel System Pressure Relief -> Removal & Installation
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS
Fuel System Pressure Relief
Do not smoke or allow an open flame of any type when working on or near any fuel system related components. The highly flammable vapor mixtures may ignite, resulting in serious personal injury.
Prior to disconnecting fuel lines, the fuel system pressure must be relieved to prevent accidental fuel spray.
After the battery has been disconnected and reconnected, some abnormal driveability symptoms may occur. The vehicle may need to be driven while it relearns its adaptive strategy.
- Ensure t...
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DRIVELINE, U-JOINT & CV AXLES REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
DRIVESHAFT, Replace
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 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 ...
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STARTER & ALTERNATOR REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
Alternator, Replace
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS
- Disconnect battery ground cable at battery.
- Remove drive belt.
- Remove protective cover, as required, and disconnect electrical connectors.
- Remove alternator mounting bol...
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MAINTENANCE LAMP RESET PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
Mercedes-Benz -> Fuel Reserve & Fuel Cap Placement Warning Lamp ->
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS
The Fuel Reserve and Fuel Cap Placement warning lamp will illuminate when the ignition switch is placed in the On position to indicate the warning system is operational. After the engine has been started, the warning lamp should go off. If the warning lamp is blinking, the fuel tank filler cap is improperly installed or a leak in the fuel system has been detected. Properly install the fuel tank filler cap. If fuel tank filler cap was improperly...
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RADIATOR & HOSE REPLACEMENT PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
Radiator, Replace
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS
- Drain coolant into a suitable container.
- Remove bottom engine compartment panel.
- Remove coolant hoses from coolant pump.
- Remove coolant overflow hose from radiator.
- Remove screw holding air scoop and from air scoop from air filter.
- Remove fan cowl and place over fan.
- Remove strut and crossmember.
- Remove radiator cover screws.
- ...
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SERPENTINE BELT SERVICE PROCEDURES FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
Serpentine Drive Belt, Replace -> External Dampner -> Internal Dampner
Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS
Internal Dampner
- Loosen bolt on tensioner pulley 1/4 to 1/2 turn.
- Rotate tensioner counterclockwise using suitable tool to remove drive belt.
- Remove drive belt.
- Clean and inspect belt surfaces of all pulleys.
- Reverse procedure to install, noting the following:
- Torque fan bolt to 72 in. lbs.
- T...
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COMPONENT LOCATION DIAGRAMS FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
Component location diagrams for most 1991 MERCEDES-BENZ 300SL cars and light trucks sold in the U.S. from 1990+.
![]() Components on diagram: |
![]() Components on diagram: |
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WIRING DIAGRAMS FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
OEM drawn wiring diagrams for most 1991 MERCEDES-BENZ 300SL cars and light trucks sold in the U.S.
![]() Components on diagram: |
![]() Components on diagram: |
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TECHNICAL SERVICE BULLETINS FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
OEM TSB listings for most 1991 MERCEDES-BENZ 300SL cars and light trucks sold in the U.S. from 1985+.
Document: Introduction of Improved Single-Component Windshield/Window Bonding System Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS Auto Systems: |
Document: Instrument Cluster Oil Level Messages Vehicle: 1991 MERCEDES-BENZ 300SL 3.0 L6 GAS Auto Systems: |
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COMPONENT/PARTS SPECIFICATIONS FOR 1991 MERCEDES-BENZ 300SL AUTOMOBILES
BRAKE SPECIFICATIONS: Brake drum, rotor, caliper, and related specifications for most 1991 MERCEDES-BENZ 300SL 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 300SL 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 300SL 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 300SL 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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