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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 09-23-2014, 06:40 PM
AV8R4AA AV8R4AA is offline
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Mein Auto: 86 635,87 M6,2000 528it
Inline 6 belt tensioners....

I replaced my serpentine belt tensioner with the hydraulic piston tensioner
When I did my cooling system-ectomy.
I have been very pleased with the operation of the tensioner.

Trying to learn is there a hydraulic piston type tensioner for the AC belt?
I replaced my AC belt tensioner with the coil spring type.
Would really like to have the piston type on the AC belt.
Is there a kit or part number I can buy?
If so, will it fit in my 2000 528it?
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  #2  
Old 09-23-2014, 08:55 PM
edjack edjack is offline
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Visit the parts counter at your local BMW dealer.
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  #3  
Old 09-23-2014, 09:01 PM
AV8R4AA AV8R4AA is offline
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That's a 80 mile round trip.
Is there a part, or not?
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  #4  
Old 09-23-2014, 09:26 PM
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16valex 16valex is offline
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Quote:
Originally Posted by AV8R4AA View Post
That's a 80 mile round trip.
Is there a part, or not?

Here it is.

I don't see why this wouldn't work on yours.

http://www.realoem.com/bmw/showparts...45&hg=11&fg=18
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Old 09-23-2014, 09:46 PM
AV8R4AA AV8R4AA is offline
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Thank you Sir!!!!!!
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  #6  
Old 09-24-2014, 09:24 AM
cn90 cn90 is offline
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There are critics of either mech vs hydraulic.
Some people do the conversion from mech ---> hydraulic.

Personally, I see no problem with either design, so whatever came with your car, replace with the same stuff.
No need to complicate matter.
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Old 09-24-2014, 03:40 PM
rdl rdl is online now
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CN90 is correct - both will work.
There was however a TSB describing a reason for replacing the "mechanical" (round spring) with "hydraulic" (compression spring in a sleeve) if the mechanical one was generating a rattle. The mechanical design has two bolts and if the mounting surfaces aren't perfectly flat some rocking can occur which generates the noise. The hydraulic design has 3 bolts so no rocking is possible. I recall a post where someone overcame the mechanical tensioner rattle by mounting the tensioner with thin gasket material; enough to take up the play and prevent the rattle.

Also, BMW sold a pulley for the hydraulic tensioner, but not for the mechanical. Mechanical replacement meant buying the entire assy at a significant price increment. OTOH Dayco lists 89133 & 89046 as replacement pulleys - try NAPA etc.
http://www.daycoproducts.com/dayco%C...sioner-pulleys

EDIT: those pt#s are for M54 engines. Others, especially the V8s, are/could be different.
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Last edited by rdl; 09-24-2014 at 03:43 PM.
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  #8  
Old 09-25-2014, 05:43 AM
cn90 cn90 is offline
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On the issue of mech tensioner.
No need to buy the entire assembly from BMW or INA, you can buy only the pulley.
But the situation has changed during the last few years with virtually all pulleys made in China.

I wrote an UPDATE below if you want quality bearing made by NTN in Canada:

http://www.bimmerfest.com/forums/sho...d.php?t=784838
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Old 09-25-2014, 06:01 AM
rdl rdl is online now
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Quote:
Originally Posted by cn90 View Post
...
I wrote an UPDATE below if you want quality bearing made by NTN in Canada:

http://www.bimmerfest.com/forums/sho...d.php?t=784838
Nice info, useful to know.
I missed your update when you posted it. Thanks.
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