Jump to content

Welcome to RennTech.org Community, Guest

There are many great features available to you once you register at RennTech.org
You are free to view posts here, but you must log in to reply to existing posts, or to start your own new topic. Like most online communities, there are costs involved to maintain a site like this - so we encourage our members to donate. All donations go to the costs operating and maintaining this site. We prefer that guests take part in our community and we offer a lot in return to those willing to join our corner of the Porsche world. This site is 99 percent member supported (less than 1 percent comes from advertising) - so please consider an annual donation to keep this site running.

Here are some of the features available - once you register at RennTech.org

  • View Classified Ads
  • DIY Tutorials
  • Porsche TSB Listings (limited)
  • VIN Decoder
  • Special Offers
  • OBD II P-Codes
  • Paint Codes
  • Registry
  • Videos System
  • View Reviews
  • and get rid of this welcome message

It takes just a few minutes to register, and it's FREE

Contributing Members also get these additional benefits:
(you become a Contributing Member by donating money to the operation of this site)

  • No ads - advertisements are removed
  • Access the Contributors Only Forum
  • Contributing Members Only Downloads
  • Send attachments with PMs
  • All image/file storage limits are substantially increased for all Contributing Members
  • Option Codes Lookup
  • VIN Option Lookups (limited)

Cabrio Hydraulic Pump

Recommended Posts

I found and followed the post in the DIY section to fill the cabrio top pump with pentosin.

I ran into something interesting in that my pump looks nothing like the pictures from the DIY post. I purchased the Bentley manual and I have the service manuals I purchased from Porsche Librarian; neither of those show the pump I have.

As you can see from the pictures, my pump is rotated 90 degrees clockwise, with the resevoir tank pointing at the nine o'clock position. I included one picture from the DIY article that shows the pump and tank in the 12 to 6 position.

The lines also attach at different points and there is no filler hole on the face; that one plug you see does not lead to the tank. Instead, there is a plug on the end of the tank-you can see it the pictures.

There is a plus sign (+) on the front side of the tank, so I decided that was the fill level...

To fill it I detached the whole assembly from the alluminum roll bar frame. If you look closely at the pictures you can see that there are four threaded studs that are welded to the frame; the nuts are 10 mm and the lower left nut is missing! I first had to detach all the wiring that leads into what I think is the engine control panel.

There is enough play in the lines and wiring that I could tilt the tank upward, remove the plug at the end of the tank, and add the pentosin. I used a kitchen baster (note: never use your wife's expensive William Sonoma baster/injector....) and filled the tank to the top arm of the plus sign.

I tested four open to close cycles and the top seems to be working very well now.

So has anyone seen this alternate configuration for a cabrio hydraulic pump? Anyone have information on how it should 'officially' be done?



Las Vegas, NV

2003 996 C2 cabriolet with just over 152k miles.




Link to comment
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now
  • Create New...

Important Information

We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.