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)
gbennett

Engine Squeak and Alternator Pulley Slips Counterclockwise

Recommended Posts

The car is a 2003 C4S manual transmission. It just turned 70k miles this week.

I was (still am) trying to diagnose an ever-increasing squeaking coming from the engine bay. My first effort was to remove the poly belt to check the pulleys for excessive play. When I got to the alternator pulley, I noticed that I could freely turn the pulley counterclockwise while holding the alternator still by holding on to one of the fins, If I tried to turn the pulley clockwise while holding the alternator from turning, it would not slip.

I see that the engine turns this pulley clockwise naturally, but is there still a way this could be causing the noise?

As for the squeaking, it comes on as soon as I start driving (it does't squeak at idle) and comes on intermittently. It initially was more closely tied to turning, but now squeaks regardless of turning, accelerating, etc. That is, I can be cruising with minimal load on the engine and it still squeaks on and off. Also, the squeak does not change get higher or lower with engine rpm. I noticed it this morning for the first time, and after driving maybe 20 miles, it has gotten increasingly more frequent.

Any ideas?

I appreciate your help. This board has come to my rescue numerous times!

Greg

Share this post


Link to post
Share on other sites
    You can remove these ads by becoming a Contributing Member.

:welcome:

Alternators on non-Tipronic are free wheel pulleys that do not lock - so that is normal.

Best thing to do is remove the belt and rotate each pulley - spin them if possible.

If there is any any wobble replace them.

  • Upvote 1

Share this post


Link to post
Share on other sites

Check also the power steering fluid level, with a too low fluid level, the steering pump will squeak.

  • Upvote 1

Share this post


Link to post
Share on other sites

Thanks for the quick replies gents! I just sources some Pentosin, so I'll try to top off the power steering fluid and see if that helps. I'll report back!

Share this post


Link to post
Share on other sites

:welcome: Alternators on non-Tipronic are free wheel pulleys that do not lock - so that is normal. Best thing to do is remove the belt and rotate each pulley - spin them if possible. If there is any any wobble replace them.

Are the pulleys on the alternator, a/c compressor and power steering pump replaceable?  I am tracking down an occasional whine and all of these pulleys seem to be candidates.  I've replaced the idler pulleys and tensioner pulley.  I am getting a little squeak/squeal from the power steering pulley but I don't know if it is the pump or just the pulley that is making the noise.

Share this post


Link to post
Share on other sites

Thanks Loren,

 

The noise appears to be coming from the power steering pump pulley area.  I was told by a parts supplier that replacing the pulley would not affect the noise because the noise is always in the pump, therefore, they don't sell the pulley separately.  Should I consider the pulley replacement or is it time for the pump to go before it goes on it's own?

Share this post


Link to post
Share on other sites

One more related question... the inner hub on the power steering pump pulley is not turning when engine is running.  should it be turning when the outer pulley is turning?

Share this post


Link to post
Share on other sites

What you mean with "inner hub" are you sure it's about the power steering pump pulley? By a broken shaft/pulley combination you have no more power steering and/or the combination simply falls off. Your specified pully combination refers more to the AC compressor or alternator with free wheel pulley, the explanation sounds a little confusing to me.

Share this post


Link to post
Share on other sites

What you mean with "inner hub" are you sure it's about the power steering pump pulley? By a broken shaft/pulley combination you have no more power steering and/or the combination simply falls off. Your specified pully combination refers more to the AC compressor or alternator with free wheel pulley, the explanation sounds a little confusing to me.

Yeah, I was wondering the same.

Share this post


Link to post
Share on other sites

Sorry for the confusion, I am talking about the black one in the photo link above.  The pulley on the perimeter is spinning but not the black flat center section.  I can't remember if it is supposed to spin.  Thanks,

Share this post


Link to post
Share on other sites

 

Sorry for the confusion, I am talking about the black one in the photo link above.  The pulley on the perimeter is spinning but not the black flat center section.  I can't remember if it is supposed to spin.  Thanks,

 

That's the a/c pulley. It's normal the pulley center is not rotating when the a/c is OFF. When a/c is ON, the center should rotate as one piece with the pulley all the time.

Share this post


Link to post
Share on other sites

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.


×
×
  • 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.