What should I know about Mercedes Benz R129?

Welcome to our Mercedes-Benz R129 Technical Articles section. We’ve gathered a vast collection of useful articles to help you perform many repairs and upgrades on your Mercedes-Benz. Save money by doing your own work and perform the repairs using the information we’ve provided here.

What to do if your Mercedes SL Class R129 is running rough?

Check your charging system. If your engine is running rough and misfiring you may need to change your cap, rotors and wires. If your valve cover gaskets are leaking we will show you how to replace them. Engine running lean/rough. Maybe you have a vacuum leak. If you engine is only running on one bank of cylinders you may have a bad coil.

When to replace battery in Mercedes SL Class R129?

Replace your battery if it is 5 to 7 years old. A slipping drive belt will squeal and a broken one will leave you stranded. Check your drive belt. A broken drive belt tensioner is just as bad a a broken accessory drive belt. Is your car running a little hot in traffic?

What makes a Mercedes sl129 make a clicking noise?

Check that lower control arm bushing. Uneven tire wear and unusual handling in turns can be caused by worn suspension links. Check your rear rearward upper link. A light clicking noise from your rear suspension over bumps can be the result of worn sway bar links.

What are the symptoms of a failing Mercedes R129 harness?

The typical symptoms of a failing harness are electrical errors, problems with starting the engine, poor running and rough idle. Before buying a 1992-1996 Mercedes-Benz R129, check if the harness has already been replaced.

What kind of suspension does Mercedes SL R129 have?

The R129 SL-Class cars came with a removable hardtop roof. Ask the seller if the roof is included. Ideally, put it on the car and see if it fits and latches on correctly. The SL 600 and 600 SL models are equipped with hydro-pneumatic suspension called Adaptive Damping System (ADS).

Are there shock absorbers in a Mercedes R129?

In the V12 Mercedes-Benz R129 cars, there are no conventional shock absorbers. Instead, there is a hydraulic cylinder and a hydraulic accumulator at each wheel. The suspension height can be adjusted by changing the amount of oil fed into the hydraulic cylinders. Oil is incompressible and this is where the hydraulic accumulator comes in.

Are there any problems with the R129 SL 500SL?

Distributor Caps – Early R129’s such as the 300 and 500 suffer damp distributor caps that cause misfires and other gremlins. Ensure you replace these distributor caps with premium brands and if you own the 500SL, there are two distributor caps.

When did the Mercedes SL R129 come out?

Whenever a new Mercedes is launched we never have to wait long for AMG, their tuning division, to come out with a beefed up version. The R129 was no different, and AMG got their hands on it in 1991 initially producing the AMG 500 SL.

Why does my Mercedes R129 break all the time?

The most popular reason for breaking is by jump starting a R129, NEVER JUMP START this Mercedes SL. These above are the main common problems with the R129 but other faults may come with old age or poor servicing throughout its life. The R129 overall is a very reliable car and is one of the best Mercedes’s ever built.

What to do if your Mercedes SL Class R129 is not charging?

An alternator that is not charging will eventually leave you stuck with a dead battery. Check your charging system. If your engine is running rough and misfiring you may need to change your cap, rotors and wires. If your valve cover gaskets are leaking we will show you how to replace them. Engine running lean/rough. Maybe you have a vacuum leak.

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