Vacuum pump N54 and N55


Here’s a picture of a vacuum pump on a N54 and N55,,,we have noticed that he small vacuum fitting will start to pump some oil through the vacuum line,



This is the picture behind the vacuum port,,,inside is a small diaphragm that starts to break apart and starts to leak,,,letting oil getting pumped through the vacuum line.,,,,,the oil then gets pumped up to the turbo electro control boost valve that’s next to the valve cover,,,the one that sits by cylinders 4 and 5.,,,,you might see your electro control boost valve covered in oil,,,,that’s would be because of the oil getting pumped into it from the vacuum pump

This entry was posted in Uncategorized and tagged , , , . Bookmark the permalink.

11 Responses to Vacuum pump N54 and N55

  1. Oasis says:

    This is not normal, right? Does this cause the car to become low on oil eventually? Does this inhibit the turbo from operating properly, are there symptoms? Did the customer have a complaint? Just wondering.



  2. a.a. says:

    Same questions here…


  3. Oasis says:

    Thanks for the replies. Good work.



  4. gilbert says:

    I noticed the vacuum hose from the solenoid soaked in oil. and oil leak near the solenoid. I traced the vacuum hose into the valve cover and notice that it had lots of oil inside. is this signs of a bad vacuum pump?

    also is it normal for the valve cover to have no machined holes for 5 valve cover bolts? ive done lots of E series valve covers and know those with aluminum bolts had issues. but now to see a few bolts missing and not even machined into the valve cover and head is scary


  5. Anssar Khan says:

    How many hours labour is to change on a N55 F02?


  6. euddys says:

    are the rubber O rings seals on the n54 and n55 vacuum pump the same?


Leave a Reply

Fill in your details below or click an icon to log in: Logo

You are commenting using your account. Log Out /  Change )

Facebook photo

You are commenting using your Facebook account. Log Out /  Change )

Connecting to %s

This site uses Akismet to reduce spam. Learn how your comment data is processed.