My bypass valve actuator has sprung a leak

Driving my car this past weekend, I noticed something wasn't right. Planted the accelerator and I sped past traffic but no scream, very quiet. The bypass was staying closed.

Turns out the actuator isn't working. I applied vacuum to the actuator and no movement but air did flow (ie. I sucked on the vacuum hose). Did the same to a friend's 355 and the valve opened easily.

I didn't have any real problem with my OEM valve before so I'm gonna try to change just the actuator with the Porsche 997 unit. Anyone have any success with this?

 

Thanks for the reply. I have the part number and ordered it yesterday. I've checked my actuator thoroughly and it neither responds to or holds vacuum.

I was just curious if anybody has any first hand experience using the Porsche actuator. I will post my experience with it hopefully this weekend.

 

Finished installing the Porsche actuator today. The part number is 997-111-680-00. I ordered it from the local Porsche dealer for $127.80.

The only difference ffrom the original is the length of the actuator rod. I've read here you can shorten the rod but I decided to fashion a spacer instead. Here's a brief summary of what I did.

Using a 1 1/4" washer, drill 3 holes using the actuator mount as a template. Then 3 more holes between the others again using the mount to mark the holes. Place 3 M5 x 20 mm bolts through three of the holes and use M5 nuts with spring washers to secure the bolts to the drilled washer.

The "adapter" was then fitted over the studs on the actuator and secured using the m5 all metal lock nuts.

Then thread the actuator rod in place and secure the adapter bolts to the mount on the valve assembly using all metal M5 lock nuts.

I checked the preload making sure there would be no rattle and applied vacuum to make sure the butterfly opens fully.

Reinstall the bypass valve assembly.

It works perfectly. No rattle at idle. Nice fix for $127 plus a few dollars at the hardware store.
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Yes. That was my initial thought but I didn't want to twist the actuator rod while making new threads and risk tearing the diaphragm inside. I suppose if you clamped the Rod with a vise grip you could make more threads with a metric die and then cut the rod to length. It was more fun doing a Little garage fabrication and didn't take long at all. If my adapter didn't work, I could always try shortening and rethreading.