The mid-engined Porsche Boxster is a very practical sports car. It features two trunks and Porsche thought through just about everything. This includes making maintenance fairly easy. Including making it easy to change the serpentine belt. Unlike some other cars with the engine in the middle (like the Ferrari F355), Porsche doesn’t require that the engine get removed.
Below are the steps to change the serpentine belt in a Porsche Boxster or Cayman. We did this on a 986 Boxster, but the steps should be similar on the 987 Boxster / Cayman and even the 981 Boxster / Cayman.
Before you begin, you will need a 24mm wrench, a 10mm socket and a socket wrench. You will also need a new serpentine belt for your year Porsche Boxster or Cayman. There are two different belts available for the Boxster and Cayman, one is for cars with air conditioning and one for cars without.
Changing the belt is a greasy job, so it is a good idea to cover the materials in the car behind the seat area. If you don’t do this be prepared to us plenty of cleaner.
Step 1: Move Seats Forward
Since the Boxster and Cayman are mid-engined, Porsche provides an access panel to change the serpentine belt. In order to get to the panel you need to move both seats all the way forward and fold them forward.
Step 2: Remove Carpet Cover
The carpet piece behind the seats needs to be removed. To do so, lift the top carpet piece (if you have the storage shelf installed you may need to remove it) to allow access to the screw on plastic fasteners. Unscrew all four fasteners and put them in a place you won’t lose them. Next lift the carpet piece up and out. Place the carpet to the side.
Step 3: Remove Access Cover
Once the carpet is removed it reveals a metal access cover. Using the socket wrench and the 10mm socket, remove each of the bolts holding the panel cover. Put the panel cover to the side as well as each of the bolts and nuts.
Before moving to the next step, we recommend that you take a few pictures of how the existing belt is installed.
Step 4: Remove Belt
Using the 24mm wrench apply a downward pressure to the belt tensioner. The tensioner is located near the middle of the engine and is the only part in that location that a 24mm wrench fits on. While keeping the downward presser on the tensioner, work the belt out of each pulley.
Step 5: Install New Belt
Put the new belt over each pulley except for the belt tensioner. If you don’t remember how it was installed, now is the time to reference the photos you took earlier. Next take the 24mm wrench and use it to put downward pressure on the belt tensioner. To help make sure it is easy to put the belt back on the tensioner it helps if the wrench is as close to straight up as possible when you start the downward motion. With the tensioner being held down finish putting the belt on the tensioner and make sure it is on each pulley correctly. Once the belt is installed correctly, release the pressure on the belt tensioner.
Step 6: Reinstall Access Cover
Put the metal cover back over the opening. Take each of the 10mm bolts and hand tighten them. Next take the socket wrench with the 10mm socket attached to tighten each bolt.
Step 7: Reinstall Carpet Cover
Take the piece of carpet that covered the back panel and reinstall it behind the seats. Lift up the carpet above the carpet panel and screw on the plastic screw on fasteners.
That’s all there is to it. After you finish, you will want to take a short drive to make sure everything works correctly and that there is no belt slippage. We know that sometimes words are a little hard to follow, so we have put together this video of the entire process.
Trouble watching the video? Go to the original YouTube video.