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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > DIY Guides > DIY-Replacing N52 tensioner, idler pulley and serpentine belt



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TwinT1addict's Avatar DIY-Replacing N52 tensioner, idler pulley and serpentine belt
TwinT1addict
12-24-2011
Welcome everyone. As you may know i have up in the general section about changing my belt tensioner, belt and idler pulley. I completed this job successfully and will do the best i can to write my first DIY to replace the tensioner, serpentine belt and idler pulley...
  #66  
By LittleBlue on 06-23-2013, 11:57 AM
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Where is everyone getting their parts from? OEM is more expensive than aftermarket, considering original lasted till 60k miles I can't imagine A.M would last less than that, thoughts?

Prices paid ?
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  #67  
By LittleBlue on 06-25-2013, 10:21 AM
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.
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  #68  
By omerfar23 on 06-25-2013, 01:37 PM
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Is dayco a good brand? is using non-oem part risky? I alway get parts from rockauto, who usually has excellent prices despite their hefty shipping prices.
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  #69  
By LittleBlue on 06-25-2013, 01:45 PM
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Quote:
Originally Posted by omerfar23
Is dayco a good brand? is using non-oem part risky? I alway get parts from rockauto, who usually has excellent prices despite their hefty shipping prices.
Seems most are out of the idler pulley, I've ordered my parts today from oembimmerparts.com. Good prices all for $120 shipped.

They have INA Tensioner, Contitech belt, Genuine BMW torx bolt and they have INA Pulleys as well as two other brands, they said they will ship what they have in stock for the pulleys. All with one year warranty as others. I need to get this done so couldn't wait on AutohauzAZ To get the pulleys in as they are out and not sure how long it would be.
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  #70  
By LittleBlue on 06-26-2013, 12:51 PM
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Quote:
Originally Posted by ska325xi
Oh, then i'll need to retorque mine

Makes sense cuz that bolt is pretty big
About to do mine in the next couple of days and wondering about the torque, first was mentioned 18ft lbs then a full 90 degrees, then 59ft lbs, wouldn't the 18+90 degrees equate to 59 ft lbs ?
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  #71  
By JS82 on 06-27-2013, 11:34 PM
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Quote:
Originally Posted by LittleBlue View Post
About to do mine in the next couple of days and wondering about the torque, first was mentioned 18ft lbs then a full 90 degrees, then 59ft lbs, wouldn't the 18+90 degrees equate to 59 ft lbs ?
According to BMW TIS: 18ft lbs + 90 degrees for the belt tensioner
BMW TIS and Bentley Manual: (Ina) Idler pulley that is attached to the alternator 59ft lbs.
Check the pictures I posted on previous page.
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  #72  
By LittleBlue on 06-28-2013, 09:42 AM
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Quote:
Originally Posted by JS82

According to BMW TIS: 18ft lbs + 90 degrees for the belt tensioner
BMW TIS and Bentley Manual: (Ina) Idler pulley that is attached to the alternator 59ft lbs.
Check the pictures I posted on previous page.
Got it thanks, so we are assuming the the idler pulley to be the same as that on the alternator since its not specified right? It's a fair assumption I think, thanks ! Will report back on how it all went and whether it resolves the whistle noise, which I am hoping on .
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  #73  
By JS82 on 06-28-2013, 11:41 AM
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Quote:
Originally Posted by LittleBlue View Post
Got it thanks, so we are assuming the the idler pulley to be the same as that on the alternator since its not specified right? It's a fair assumption I think, thanks ! Will report back on how it all went and whether it resolves the whistle noise, which I am hoping on .
Yes, check the first picture on the first page of this thread that TwinT1addict has posted. You can see the INA idler pulley is attached on the bottom of the alternator. You can also see that on the Bentley Manual page that I have posted.
The torque specs are for N52 and N51 (non-turbo) engines.
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  #74  
By LittleBlue on 06-28-2013, 01:38 PM
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Got it, all done , off for a test drive.

UPDATE: well the whistle like sound did not go away!
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  #75  
By Efini on 06-28-2013, 06:47 PM
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thanks for the DIY, glad it only took me about 20min to complete the job in this heat today.
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  #76  
By brio on 07-15-2013, 10:45 AM
Great DIY.
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  #77  
By index1489 on 07-15-2013, 02:16 PM
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Quote:
Originally Posted by ska325xi View Post
Oh, then i'll need to retorque mine

Makes sense cuz that bolt is pretty big

I think I would rather do 30 ft lbs on the idler pulley then 59, 59 seems a little high, I know on the E46 the idler pulley is 30 ft lbs (well actually 33 but that is a lot closer to 30 then 59), I don't want to risk stripping the threads. (Aluminum Block = soft)

And remember 59 ft lbs is for the pulley going into the alternator not the block.

With all this uncertainly its better having it closer to the E46 number and better having it under then over torqued.

I actually was taking to Bentley about this they claim it doesn't show up anywhere and it is not uncommon for BMW's and they recommended using the bolt chart on the first page of the Bentley Service Manual, I sent them this.

Quote:
I checked TIS, the bolt for the belt tensioner is one time use only and should be replaced, 25nm + 90 degrees.

The idler pulley is impossible to find anywhere, some people claim to use the torque number for the alternator idler pulley, but this pulley goes into the alternator not the soft aluminum block and I think it is too high (59 ft lbs).

Under the belt tensioner torque TIS specify "deflection pulley to alternator" as 40nm (30 ft lbs) which is different then if you look in TIS under Alternator it specify it as 80nm or the 59 ft lbs you guys yourself have in the Bentley manual.


This plus the fact that I know the idler pulley on the E46 is 33 ft lbs made me torque it to 30 ft lbs to not risk stripping the hole in the block.

You can see my post with a screenshot of TIS post #50
http://www.e90post.com/forums/showth...+torque&page=3

And scrolling down some more someone else posted screenshots of the other screen in TIS showing 80nm.

So In my opinion I think "deflection pulley to alternator" is a poor german translation and actually means the torque for the idler pulley (40nm or 30 ft lbs) as looking under the BMW parts catalog the idler pulley is described as deflection pulley and the pulley for the alternator is described as something different.
Attached Images
 
Last edited by index1489; 07-15-2013 at 03:07 PM.
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  #78  
By Zero_09 on 07-15-2013, 11:07 PM
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Quote:
Originally Posted by 07SGe90 View Post
thanks for the DIY, glad it only took me about 20min to complete the job in this heat today.
20min. That's fast. Makes me want to get the parts and do this now.
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  #79  
By JS82 on 07-16-2013, 10:12 AM
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Quote:
Originally Posted by index1489 View Post
I think I would rather do 30 ft lbs on the idler pulley then 59, 59 seems a little high, I know on the E46 the idler pulley is 30 ft lbs (well actually 33 but that is a lot closer to 30 then 59), I don't want to risk stripping the threads. (Aluminum Block = soft)

And remember 59 ft lbs is for the pulley going into the alternator not the block.

With all this uncertainly its better having it closer to the E46 number and better having it under then over torqued.

I actually was taking to Bentley about this they claim it doesn't show up anywhere and it is not uncommon for BMW's and they recommended using the bolt chart on the first page of the Bentley Service Manual, I sent them this.




So In my opinion I think "deflection pulley to alternator" is a poor german translation and actually means the torque for the idler pulley (40nm or 30 ft lbs) as looking under the BMW parts catalog the idler pulley is described as deflection pulley and the pulley for the alternator is described as something different.


TIS states it has to be 80 Nm for the idler pulley which is attached to the alternator housing.
Bentley manual says the same.
My old and new idler pulley are OEM BMW, made by Ina. Check the screenshot of TIS: Belt pulley (ribbed V-belt) with freewheel (Ina) fitted to Bosch and Valeo alternators: 80 Nm
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  #80  
By ska///235i on 07-16-2013, 11:04 AM
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Quote:
Originally Posted by Zero_09
20min. That's fast. Makes me want to get the parts and do this now.

Yea, its pretty straight forward if you have the right tools. Make sure you have at least 14in breaker bar to unload the tesioner...well its just alot easier.

Im glad i did mine cuz this is when i found out my oil filter housing is leaking....another diy project lol
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  #81  
By LittleBlue on 07-16-2013, 11:46 AM
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So which is it ? If I tightened to 59lbs can I loosen it to 33lbs or is it too late?
Last edited by LittleBlue; 07-16-2013 at 01:10 PM.
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  #82  
By ska///235i on 07-16-2013, 12:01 PM
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Quote:
Originally Posted by LittleBlue
Do which is it ? If I tightened to 59lbs can I loosen it to 33lbs or is it too late?
Meet halfway (45 ft lbs) lol
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  #83  
By LittleBlue on 07-16-2013, 01:11 PM
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Quote:
Originally Posted by ska325xi View Post
Meet halfway (45 ft lbs) lol
Well already done a couple of weeks ago, just wondering if it is bad to loosen it or just leave it alone
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  #84  
By index1489 on 07-16-2013, 09:24 PM
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Quote:
Originally Posted by JS82 View Post


TIS states it has to be 80 Nm for the idler pulley which is attached to the alternator housing.
Bentley manual says the same.
My old and new idler pulley are OEM BMW, made by Ina. Check the screenshot of TIS: Belt pulley (ribbed V-belt) with freewheel (Ina) fitted to Bosch and Valeo alternators: 80 Nm

Do you know how to do a conversion? 59 ft lbs = 80 NM this isn't what is being disputed.

If you look under the torque for the belt tensioner it shows deflection pulley to alternation as 40nm or 30 ft lbs, I'm claiming this is poor translation and actually means the torque for the idler pulley. (non alternator). Based on the evidence I posted above.


The torque for the alternator idler pulley is 59 ft lbs and this is not disputed.
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  #85  
By JS82 on 07-16-2013, 11:43 PM
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Quote:
Originally Posted by index1489 View Post
Do you know how to do a conversion? 59 ft lbs = 80 NM this isn't what is being disputed.

If you look under the torque for the belt tensioner it shows deflection pulley to alternation as 40nm or 30 ft lbs, I'm claiming this is poor translation and actually means the torque for the idler pulley. (non alternator). Based on the evidence I posted above.


The torque for the alternator idler pulley is 59 ft lbs and this is not disputed.
Yes I know how to do a conversion (I'm familiar with the metric system).
It wasn't really clear which pulley you meant.
I thought you meant the idler pulley attached to the alternator, which is 59ft lbs.
This diy is talking about replacing that idler pulley on the alternator and the belt tensioner, so I didn't know you meant something else.
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  #86  
By Zero_09 on 07-29-2013, 03:40 PM
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Quote:
Originally Posted by AlanAZ View Post
The tensioner is expensive, even from Tischer. You can get both for half the list price from places like RMeuropean (although I'm noticing it's out of stock -- you may need to wait a bit), just google the part number. Don't forget to order the bolt, it's one time use only. Best to replace both pulleys, and the belt if it hasn't been done.

http://www.rmeuropean.com/Part-Numbe..._85E85BAC.aspx
So this part is
Mechanical belt tensioner #11287530314
and Deflection pulley (Idler pulley) #11287535860?

It's a great price if it is but the manufacturer is INA. Is that the same manufacturer BMW uses?
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  #87  
By Zero_09 on 07-29-2013, 04:04 PM
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hi

Quote:
Originally Posted by AlanAZ View Post
The tensioner is expensive, even from Tischer. You can get both for half the list price from places like RMeuropean (although I'm noticing it's out of stock -- you may need to wait a bit), just google the part number. Don't forget to order the bolt, it's one time use only. Best to replace both pulleys, and the belt if it hasn't been done.

http://www.rmeuropean.com/Part-Numbe..._85E85BAC.aspx
Hey,

I was wondering did you get the your parts there when you this DIY?

Just want to confirm with you that this replaces the
Mechanical belt tensioner #11287530314
and Deflection pulley (Idler pulley) #11287535860?
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