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Mercedes Home > Mercedes-Benz Technical Articles  > Mercedes-Benz SL-Class R107 (1972-1989) Technical Articles
  

Mercedes-Benz SL-Class R107 (1972-1989) Technical Articles

Welcome to our Mercedes-Benz R107 (450SL) technical articles section.  We've gathered a vast collection of useful articles to help you repair many items on your Mercedes.  Save money by avoiding your mechanic and perform the repairs using the information we've provided here.  Can't find what you're looking for?  Try our Search Engine, or hop over to our Technical Bulletin Board, and ask your question to the thousands of members who post messages there every day.

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 Basics & Essentials
Air Filter Replacement
Changing the air filter on a Mercedes R107 chassis 450/380/500/560 SL is one of the easiest jobs on the car
     Applies to: 450SL R107 (1972-86)
Jacking Up and Supporting Your SL
Learn to raise and support your vehicle safely
     Applies to: 450SL R107 (1972-89)
Wiper Arm Replacement
Your windshield wipers will work better and last longer if you periodically replace your wiper arms.
     Applies to: 450 SL R107 (1975-86)
Battery Replacement
Easy step by step instructions to remove and replace your battery.
     Applies to: 450SL R107 (1972-89)
Oil and Filter Replacement
Maintain and prolong the life of your engine by performing a simple oil and filter change
     Applies to: 450SL R107 (1972-89)
Spark Plug Replacement
Get better mileage and a smoother ride by replacing your spark plugs at intervals specified for your Mercedes
     Applies to: 450SL R107 (1972-89)
Engine
Intake Manifold Inspection and Replacement
Carbon build up layering the inside of your intake manifold could be robbing your engine of precious performance. Replace it for more power.
     Applies to: 450 SL R107 (1975-86)
Replacing Ignition Wire Rotor and Distributor Cap
One basic tune-up procedure for just about any car on the road is the replacement of your spark plugs and spark plug wires.
     Applies to: 450 SL R107 (1975-86)
Distributor Replacement
Follow these easy steps to replace your distributor
     Applies to: 450 SL R107 (1975-86)
Alternator Replacement
Follow these easy steps to replace your alternator
     Applies to: 450 SL R107 (1975-86)
Replacing the AC Belts
Belt making noise? Has it fryed or broke? Learn how to replace it and more.
     Applies to: 450 SL R107 (1975-86)
Replacing the AC Compressor
If your AC is no longer blowing cold it could be time for a new compressor, learn how to replace it.
     Applies to: 450 SL R107 (1975-86)
Replacing Timing Chain Sprocket
Learn how to replace the timing chain sprocket
     Applies to: 450 SL R107 (1975-86)
Replacing Timing Chain Tensioner
Timing chain slip? Learn how to replace the timing chain tensioner
     Applies to: 450 SL R107 (1975-86)
Replacing Timing Chain Tensioner Rail
Timing chain issues? Learn how to replace the timing chain tensioning rail
     Applies to: 450 SL R107 (1975-86)
Replacing Timing Chain Top Guide Rail
Follow these steps to replace the timing chain top guide rail
     Applies to: 450 SL R107 (1975-86)
Replacing Valve Cover Gasket
Oil leaking from valve cover? Could need a new gasket, learn how to replace the valve cover gasket
     Applies to: 450 SL R107 (1975-86)
Replacing the AC Evaporator
If your AC is no longer blowing cold, it could be time for a new evaporator. Learn how to replace it.
     Applies to: 450 SL R107 (1975-86)
Replacing the AC Receiver Drier
If your AC is no longer blowing cold, it could be time for a new receiver/drier. Learn how to replace it.
     Applies to: 450 SL R107 (1975-86)
Replacing the Timing Chain
How to replace the timing chain.
     Applies to: 450 SL R107 (1975-86)
Removing and Replacing the Engine Mounts
Over time your engine mounts can take a set and loose their cushioning ability. Replacing the mounts is a straight forward job and can reduce vibration that might lead to serious issues down the road. Learn how to replace your engine mounts.
     Applies to: 450 SL R107 (1972-80)
Replacing Engine Shock Absorbers
Here's how to replace engine shock absorbers.
     Applies to: 450 SL R107 (1972-80)
Removing and Replacing the Oil Pump
Loosing oil pressure can have a catastrophic effect on your engine. The culprit maybe the oil pump. Normally you would have to pull the engine to replace or drop the entire front end. This article describes how to change the oil pump without having to do either but it will take time.
     Applies to: 450 SL R107 (1972-80)
 Cooling
Radiator Replacement
Leaky radiator? Learn how to replace it using this easy to follow tech article
     Applies to: 450 SL R107 (1975-86)
Replacing Radiator Hoses
Overtime hoses become brittle and can crack with age. Learn to replace them using this easy to follow tech article.
     Applies to: 450 SL R107 (1975-80)
Windshield Fluid Tank Replacement
Step by step instructions to replace your windshield fluid reservoir tank
     Applies to: 450 SL R107 (1975-80)
Coolant Expansion Tank Replacement
Bad coolant expansion tank? The good news is that the replacement tank is relatively inexpensive and can be changed in less than an hour.
     Applies to: 450 SL R107 (1975-80)
Replacing Cooling Fan Clutch
Overheating? The cooling fan clutch could be the cause, learn how to check and if need be replace it
     Applies to: 450 SL R107 (1975-86)
Replacing Water Pump
Follow these instructions on replacing the water pump
     Applies to: 450 SL R107 (1975-86)
Replacing the Thermostat
Heating and Cooling off? You may need a new thermostat, here is how to check and replace it
     Applies to: 450 SL R107 (1975-86)
Transmission
Changing Auto Transmission Fluid
Learn how to change automatic transmission fluid.
     Applies to: 450 SL R107 (1972-80)
Diagnosing and Replacing Auto Trans Kick-down Solenoid
Learn how to diagnose and replace the automatic transmission kick-down solenoid switch.
     Applies to: 450 SL R107 (1972-80)
Changing the Differential Fluid
Your differential oil is often ignored, yet has a big impact on your differential gears and overall performance. Changing the oil is easy when you follow these simple steps.
     Applies to: 450 SL R107 (1972-80)
Brakes
Bleeding Brake Lines
Bleeding brakes can be tricky. Here are some tips to make the job easier.
     Applies to: 450 SL R107 (1975-86)
Front Brake Pads Replacement
Easy step by step instructions to replace your brake pads
     Applies to: 450 SL R107 (1975-86)
Master Cylinder and Brake Fluid Reservoir Replacement
The brake master cylinder sometimes get old and wears out. If your brakes are feeling spongy, then you might need to overhaul your system, which includes replacement of the master cylinder.
     Applies to: 450 SL R107 (1975-86)
Replacing Brake Fluid
Step by step instructions to change your brake fluid
     Applies to: 450 SL R107 (1975-86)
Replacing Front Brake Lines
In this article, I will go over the steps to replace your front brake lines.
     Applies to: 450 SL R107 (1975-86)
Replacing Rear Brake Rotor
Follow these easy steps to replace you rear brake rotors
     Applies to: 450 SL R107 (1975-86)
Replacing Rear Parking Brake Pads
Easy Instructions on replacing rear parking brake pads
     Applies to: 450 SL R107 (1975-86)
Replacing Rear Calipers
Step by step instructions on replacing rear brake calipers
     Applies to: 450 SL R107 (1975-86)
Replacing Rear Brake Lines
Follow these instructions to replace the rear brake lines
     Applies to: 450 SL R107 (1975-86)
Replacing Rear Brake Pads
Steps to replace your rear brake pads
     Applies to: 450 SL R107 (1975-86)
Adjusting Rear Parking Brake
A quick yet complete run down on adjusting the parking brakes
     Applies to: 450 SL R107 (1975-86)
Replacing Front Brake Calipers
Step by step instructions on replacing your front brake calipers
     Applies to: 450 SL R107 (1975-86)
Electrical
Alternator Inspection and Component Replacement
Your alternator charges your Mercedes R107's electrical system. Improve battery life with new alternator components.
     Applies to: 450 SL R107 (1975-86)
Headlight and Headlight Cover Replacement
New headlight covers and headlights look better, while new front lights will light a bright path ahead. Replace them.
     Applies to: 450 SL R107 (1975-86)
Starter Replacement
When you turn the ignition key does your car barely start? It's time to replace your starter. Here's how.
     Applies to: 450 SL R107 (1975-86)
Starter Overhaul
Rather than purchase a new starter, you may be able to overhaul your starter motor. Save some money. Here's how.
     Applies to: 450 SL R107 (1975-86)
Replacing the Glove Box and Light
Use this tech article to replace your glove box and fix that broken light.
     Applies to: 450 SL R107 (1975-86)
Replacing the Double Contact Relay
Fuses good but blower motor still on the fritz? It may be time to change the double contact relay.
     Applies to: 450 SL R107 (1975-86)
Fuel
Fuel Injector Inspection and Replacement
If your engine's running rough and lacks power clean and/or replace your fuel injectors for more power and a smooth running engine.
     Applies to: 450 SL R107 (1975-86)
Replacing Fuel Pump
Mercedes-Benz engines need constant fuel pressure to run correctly. If your engine is giving you trouble it might be time to replace your fuel pumps. Everything you need to do the job is contained in this article.
     Applies to: 450 SL R107 (1975-86)
Replacing the Fuel Filter
Keep your fuel injectors clean and your engine running smooth by regularly replacing your fuel filter. Follow these instructions for a cleaner running engine.
     Applies to: 450 SL R107 (1975-86)
Replacing the Fuel Reservoir
Use this tech article to replace your fuel reservoir.
     Applies to: 450 SL R107 (1975-86)
Replacing the Fuel Suction Dampener
If you are experiencing erratic acceleration, it may be time to replace the fuel suction dampner. Follow these easy step-by-step instructions.
     Applies to: 450 SL R107 (1975-86)
Replacing the Warm Up Regulator
If your acceleration is muted the warm up regulator may be broken or on its way to being kaput. Replace it with this tech article
     Applies to: 450 SL R107 (1975-86)
Fuel Distributor Replacement
Learn how to replace your fuel distributor
     Applies to: 450 SL R107 (1975-86)
Exhaust
Replacing Exhaust Manifold Gasket
Complete instructions on how to replace your exhaust manifold gaskets.
     Applies to: 450 SL R107 (1972-80)
Removing and Replacing the Oxygen Sensor
The oxygen sensor is arguably one of the most important devices on your car. It helps to reduce the emissions while adjusting engine performance. The oxygen sensor should be replaced every 30,000 miles. Lear how this simple fix can keep your car running in tip top shape.
     Applies to: 450 SL R107 (1972-80)
Replacing the Exhaust Line and Muffler
Is your car making excessive exhaust noise? Here's how to replace the exhaust line and muffler.
     Applies to: 450 SL R107 (1972-80)
Suspension
Replacing the Power Steering Fluid
Everything you need to know to change your power steering fluid.
     Applies to: 450 SL R107 (1975-86)
Replacing the Power Steering Pump
Over time, power steering pumps tend to fail. In this article, we'll go over the steps involved with replacing the pump.
     Applies to: 450 SL R107 (1975-86)
Replacing the Power Steering Filter
Step by step instructions to replace your power steering filter.
     Applies to: 450 SL R107 (1975-86)
Removal and Installation of the Center Link
The steering responds though several bushings and struts. The center link is the first bushing set up past the steering box to examine if too much play is occurring. Learn how to replace the center link.
     Applies to: 450 SL R107 (1975-86)
Removal and Installation of the Drag Link Bushings
Each front wheel has a drag link. If you notice that the front wheels feel a shudder or vibration or there is slop in the responsiveness the drag link bushings may need to be replaced. Learn how to replace the bushings.
     Applies to: 450 SL R107 (1975-86)
Removal and Installation of the Idler Arm Bushings and Bearings
If your steering has more play then normal, the idler arm bushings may be worn out. Learn how to change them.
     Applies to: 450 SL R107 (1975-86)
Removal and Installation of the Steering Dampener Strut
Feeling vibrations over bumps or at speed? The steering dampener strut may be worn out. Learn how to replace the dampener strut.
     Applies to: 450 SL R107 (1975-86)
Removal and Installation of the Tie Rod
Has the tie bar been broken or bent? Learn how to remove and replace it.
     Applies to: 450 SL R107 (1975-86)
Overview and Diagnostics of the Front Suspension
Your front end has many parts that all influence your driving condition and performance. Learn which each component does and how to diagnose your front end.
     Applies to: 450 SL R107 (1975-86)
Removing and Replacing the Front Wheel Assembly
The front wheel hub and bearing set may become damaged., Learn how to swap out the old for a new one.
     Applies to: 450 SL R107 (1975-86)
Removing and Replacing the Pitman Arm
The Pitman Arm plays an important role in steering and handling. Learn how to trouble shhot and replace if it fails.
     Applies to: 450 SL R107 (1975-86)
Removing and Replacing the Steering Knuckle
Seeing uneven tire wear? Perhaps the front wheels seem to shudder on turns? It could be a failed steering knuckle. Learn how to replace it.
     Applies to: 450 SL R107 (1975-86)
Removing the Replacing the Upper Control Arm
The upper control arm houses the steering ball joint. To replace the ball joint, the upper control arm has to be replaced. Learn how.
     Applies to: 450 SL R107 (1975-86)
Removing and Replacing the Steering Gearbox
When you have checked all your steering components and still have steering issues like slop and jittering, maybe its time to swap out the steering gearbox. Learn how in this step-by-step process.
     Applies to: 450 SL R107 (1972-80)
Remove and Replace Rear Shock Absorbers
Over time your rear shocks can begin to give way, your ride becomes less comfortable. Replacing the shocks is simple if you follow the following steps.
     Applies to: 450 SL R107 (1972-80)
 Body & Interior
Front Bumper Removal and Replacement
If your front bumper's looking well past its prime give your Mercedes a fresh face with a new bumper.
     Applies to: 450 SL R107 (1975-86)
Hood Removal
Should you have some DIY work to do in your engine bay, remove your hood for easy access.
     Applies to: 450 SL R107 (1975-86)
Hood Latch Cable Replacement
Over time your hood latch cable can stretch and fail to function. Replace it before this happens, so you can access your engine.
     Applies to: 450 SL R107 (1975-86)
Heater Blower Motor Replacement
The blower motor is responsible for bringing heat into the cabin by passing air over a heater coil. Replace it to bring the heat.
     Applies to: 450 SL R107 (1975-86)
Replacing the Front Bumper Shock
The front bumper shock may need to be replaced if you have an accident and the shock is hyper-compressed.
     Applies to: 450 SL R107 (1975-86)
Replacing the Horn
Horn sounding rather weak or not at all? Time to replace it, learn how and much more.
     Applies to: 450 SL R107 (1975-86)
Replacing the Front Bumper Guard
Follow these instructions to replace your front bumper guard
     Applies to: 450 SL R107 (1975-86)
Replacing the Door Panel
The door panel provides access to several key parts found within the door. Learning how to remove the panel can save hundreds of dollars in labor costs. Learn how in a simple step by step process.
     Applies to: 450 SL R107 (1975-86)
Replacing the Steering Wheel
An upgrade or replacement, this article explains a simple trick to help you remove the steering wheel with little effort.
     Applies to: 450 SL R107 (1975-86)
Replacing Interior Door Handle
Door not opening from the inside? Maybe it's time to change the interior door handle mechanism. Learn how.
     Applies to: 450 SL R107 (1975-86)
Replacing the Door Latch
The door latch can become damaged not allowing your door to close or lock properly. Learn how to easily remove and replace.
     Applies to: 450 SL R107 (1975-86)
Replacing the Side Mirror
The side mirror can fail or become damaged requiring replacement. This article provides a step by step process to easily replace the mirror.
     Applies to: 450 SL R107 (1975-86)
Replacing Door Lock Vacuum Actuator
You door lock no longer locks? It could be something as simple as replacing the door lock actuator. Learn how simple it is to fix.
     Applies to: 450 SL R107 (1975-86)
Replacing Exterior Door Handle
If you don't know the simple techniques to replace your exterior door handle you could be wasting hours of time and possibly costing you more than anticipated. His article provides the simple steps as well as a few techniques that are helpful for you to replace the door handle.
     Applies to: 450 SL R107 (1975-86)
Replacing the Window Seal
Window not sealing when closed? Perhaps it's time to replace the window seal.
     Applies to: 450 SL R107 (1975-86)
Replacing the Window Motor
Window not closing properly or at all? You may need to replace the window motor.
     Applies to: 450 SL R107 (1975-86)
Replacing the Window Lifting Mechanism
Window not lifting properly? Time to replace the window lifting mechanism.
     Applies to: 450 SL R107 (1975-86)
Replacing the Door Window
Broken window? Here's how to easily install and replace a window.
     Applies to: 450 SL R107 (1975-86)
Door Glass Adjustment
How to adjust your door glass.
     Applies to: 450 SL R107 (1975-86)
Removal of the Instrument Cluster
How to remove the instrument cluster panel.
     Applies to: 450 SL R107 (1975-86)
Driver Seat Replacement
How to remove and replace the driver's seat.
     Applies to: 450 SL R107 (1975-86)
Instrument Light Replacement
How to replace the light in the instrument panel
     Applies to: 450 SL R107 (1975-86)
Interior Floor Lamp Replacement
How to replace the floor lamp.
     Applies to: 450 SL R107 (1975-86)
Passenger Seat Replacement
How to remove and replace the front passenger seat.
     Applies to: 450 SL R107 (1975-86)
Removing and Replacing the Automatic Transmission Shift Handle
Has you shift knob worn out? Maybe you want to upgrade to something with more style? Replacing the shift knob is an easy task if you follow these simple steps.
     Applies to: 450 SL R107 (1972-80)
Removing and Replacing the Ignition Switch
Your steering lock is for safety and security. The lock pin may wear or break requiring replacement. There are a few tricks of the trade to consider to make this job easy and less expensive than a visit to the shop. Learn how to replace the steering lock.
     Applies to: 450 SL R107 (1972-80)
Replacing the Seat Belt
Your seat belt can become frayed with time or the retraction mechanism can fail. Learn how to remove and replace the seat belt.
     Applies to: 450 SL R107 (1972-80)
Diagnosing and Fixing Hardtop Roof Clasps
Your hardtop is a marvel of engineering wonder but it can sustain damage and even failure. Learn how to evaluate the mechanism and repair if needed.
     Applies to: 450 SL R107 (1972-80)
Remove and Replace Roof Latch
Over time your roof latch can become worn and no longer keep the hardtop down or protect you from the weather. Learn how to easily replace the roof latch.
     Applies to: 450 SL R107 (1972-80)
Miscellaneous
Replacing the Vacuum Element Defrost Changeover Flap
Keep fresh air flowing into your car with this tech article.
     Applies to: 450 SL R107 (1975-86)
Replacing the Bi Level DEF Vacuum Switchover Valves
Defrost blower not working? Use this tech article to fix it.
     Applies to: 450 SL R107 (1975-86)
Replacing the Climate Control Amplifier
Fix your broken climate control amplifier with this article.
     Applies to: 450 SL R107 (1975-86)
Main Vacuum Switch Replacement
Follow these instructions to replace the main vacuum switch in your 450SL
     Applies to: 450 SL R107 (1975-86)
Bi Level Climate Control Vacuum Switch Replacement
Easy instructions to replace the Bi-Level Climate Control Vacuum Switch Replacement on your 450SL
     Applies to: 450 SL R107 (1975-86)
Entire Bank of Vacuum Switchover Valves Replacement
Fix your faulty bank of vacuum switchover valves in your 450SL
     Applies to: 450 SL R107 (1975-86)
Fresh Air Flap Vacuum Element Replacement
Steps to fix the fresh air flap vacuum element in your 450SL
     Applies to: 450 SL R107 (1975-86)
Fresh Air Flap Switchover Valve Replacement
Steps to fix the fresh air flap switchover valve
     Applies to: 450 SL R107 (1975-86)
Legroom Flap Switchover Valve Replacement
Steps to fix the legroom flap switchover valve in your 450SL
     Applies to: 450 SL R107 (1975-86)
Refrigerant Compressor Vacuum Switch Replacement
Steps to fix the refrigerant compressor vacuum switch in your 450SL
     Applies to: 450 SL R107 (1975-86)
AC Temperature Sensor ETR Switch Replacement
Steps to fix the AC temperature sensor ETR switch in your 450SL
     Applies to: 450 SL R107 (1975-86)
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