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Go Back   Bimmerfest - BMW Forums > BMW Model Discussions > 5 Series > E39 (1997 - 2003)

E39 (1997 - 2003)
The BMW 5-Series (E39 chassis) was introduced in the United States as a 1997 model year car and lasted until the 2004 when the E60 chassis was released. The United States saw several variations including the 525i, 528i, 530i and 540i. -- View the E39 Wiki

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  #1  
Old 10-22-2015, 02:16 PM
99528icali 99528icali is offline
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Idler pulley

Should it spin freely and quietly or does it make noise aswell?
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  #2  
Old 10-22-2015, 02:25 PM
JKRIT JKRIT is online now
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With belt off, it should turn quietly by hand, but not continue spinning. If it keeps spinning, the bearings are dry. Some will DIY and re-pack the bearings with new grease. Others (like me) will just buy new ones. Good idea to replace all three if one is about to go.
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Old 10-22-2015, 02:30 PM
99528icali 99528icali is offline
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Sounds good, also should the tensioners spin freely aswell?
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Old 10-22-2015, 02:38 PM
JKRIT JKRIT is online now
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Quote:
Originally Posted by 99528icali View Post
Sounds good, also should the tensioners spin freely aswell?
Same deal. NOT continue spinning.
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  #5  
Old 10-22-2015, 02:43 PM
99528icali 99528icali is offline
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Quote:
Originally Posted by JKRIT View Post
Same deal. NOT continue spinning.
so my tensioner (next to the alt) not spinning at all by hand is no good then right.
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  #6  
Old 10-22-2015, 02:54 PM
99528icali 99528icali is offline
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Quote:
Originally Posted by 99528icali View Post
so my tensioner (next to the alt) not spinning at all by hand is no good then right.
new question would be, is that tensioner not spinning at all, whats making my alternator not run to its potential :o
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  #7  
Old 10-22-2015, 03:32 PM
JKRIT JKRIT is online now
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Quote:
Originally Posted by 99528icali View Post
so my tensioner (next to the alt) not spinning at all by hand is no good then right.
That would be called "frozen or locked up," and usually leads to belt failure. If you mean you can turn it easily by hand, but it stops spinning as soon as you let go, then that sounds normal.

If main belt is running (even if there are some noisy idlers) and the alternator is not putting out the correct voltage, then the problem is in the alternator.
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  #8  
Old 10-22-2015, 03:34 PM
99528icali 99528icali is offline
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Quote:
Originally Posted by JKRIT View Post
That would be called "frozen or locked up," and usually leads to belt failure. If you mean you can turn it easily by hand, but it stops spinning as soon as you let go, then that sounds normal.

If main belt is running (even if there are some noisy idlers) and the alternator is not putting out the correct voltage, then the problem is in the alternator.
even if the tensioner is completely frozen?
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