BMW M3 Forum (E90 E92)

BMW Garage BMW Meets Register Search Today's Posts Mark Forums Read


Go Back   M3Post - BMW M3 Forum > E90/E92 M3 Technical Topics > DIY Guides/ Discussions
 
EXXEL Distributions
Post Reply
 
Thread Tools Search this Thread
      08-15-2015, 06:03 PM   #1
Sean05
Putcha ang ganda...
Sean05's Avatar
Philippines
116
Rep
5,394
Posts

Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

iTrader: (9)

Send a message via Yahoo to Sean05
DIY: idler pulley replacement

If your car sounds like this its your idler pulley


YELLOW ARROW IDLER PULLEY 16mm bolt to remove the Pulley
RED ARROW TENSIONER 14MM BOLT and push down to remove the tension so you can remove the belt.


STEP 1: remove the intake


STEP 2: remove the radiator fan only one screw on the fan upper left if your facing your engine then slightly pull the fan. Make sure to unplugged the fan and move any thing thats blocking the way the only tough part is to move the radiator hose just slowly pull it out again move anything thats blocking and u dont have to take anything off

STEP 3: take the cover off the pulley tentioner and get a 14mm socket and push down. It will move the tensioner so u can remove the belt... This is not the idler pulley its the one on top of that pulley


STEP 4: 16mm socket to remove the idler tensioner and replace


STEP 5: put everything back and done

Would have taken 30 minutes but i took my time

Last edited by Sean05; 08-16-2015 at 03:13 AM.
Appreciate 2
      04-04-2016, 02:12 PM   #2
Theodore
Second Lieutenant
Theodore's Avatar
United_States
30
Rep
211
Posts

Drives: 2011.5 E92 M3
Join Date: Oct 2015
Location: Tampa Bay, FL

iTrader: (0)

Thanks for the write up! The photos were very helpful and saved me time. I used it to start my idler pulley change, but ran into a significant problem I wanted to post here to help any other DIYers.

The pulley you have in your photo, BMW part #11287841228, has an off-center bolt hole and is, to the best of my knowledge, only compatible with M3's built before 4/29/08. See here for details. For production dates of 4/29/08 and newer you will need a pulley with a centered bolt hole, BMW part #11287841531.

I'm not great with the terminology, but I think this stationary idler pulley is more formally called the "deflection pulley."

Production date up to 4/29/08 on the left, 4/29/08 or later production date part on the right:





Another thing to consider is that the hoses that run below the fan shroud are clipped onto the fan shroud to hold them in place. As you pull up on the fan shroud some of them will not want to come loose easily. You can carefully try to reach below the fan shroud with one hand to loosen or remove them. When you are re-installing the fan shroud you can skip the step of clipping the hoses back in place and with a little luck, you will probably never have a problem, but it's not recommended. I couldn't find a way to re-clip those hoses back into place without removing the belly pan cover below the car. The next time I do this job I'll start by taking off the underbelly cover and unclip the hoses from the fan shroud to start with. Here are some of the clean clip marks on the hoses below. I believe there were two additional clips to the right just out of the photo.


Last edited by Theodore; 04-19-2016 at 11:42 PM.
Appreciate 0
      04-19-2016, 07:43 PM   #3
BillK
Private First Class
9
Rep
137
Posts

Drives: 95 M3, 11 M3, 15 X5d
Join Date: Sep 2010
Location: MD

iTrader: (0)

Nice to see this. It's getting close to belt change time for me
Appreciate 0
      06-14-2016, 10:38 PM   #4
jfirwin
New Member
0
Rep
11
Posts

Drives: 08 E90 M3 6spd Jerez Blk
Join Date: Apr 2013
Location: Denver, CO

iTrader: (0)

+1 for Idler Pulley Replacement

This DIY really helped.

My M3 was built in Feb 02, so I made sure I had the right idler pulley. (Thanks, Theodore!)

While I was at it, I also replaced:

the accessory belt
the accessory belt tensioner
the accessory belt pulley
the A/C Belt
the A/C belt pulley
and the A/C belt Tensioner

ECS tuning part #2777259

BTW, you can get away with not replacing these, (except the belts) when you start hearing that squealing from under the hood (mine started around 85K miles) it'll be the idler pulley. I've always believed that you should replace parts that'll liable to go bad while you are at it. The pulleys all run on bearings, so they will wear out at some point.

I couldn't get the accessory (alternator) belt off without removing the idler pulley. Perhaps someone knows a better way?

The tensioners and pulleys are 14mm bolts, less the idler pulley.

Those bolts are not on super tight, so make sure you don't wrench them down too tight.

Remember there are rubber bushings that can be crushed.

Be super careful of the radiator overflow hose. The nipple on the upper radiator breaks easily.

The hardest part to removing the fan housing is getting it past the upper radiator hose. Be patient, be careful, and you can get the housing out without breaking anything. (I didn't)

+1 for removing the underbelly cover. Not only does it make it easier to reattach those lower hoses, but also to retrieve those dropped parts/tools.



edit - Just noticed that the picture below is wrong. The A/C / Power Steering Belt goes OVER the Power Steering pulley (#3), not under. It also goes UNDER the Idler pulley (#5), not over. See the pic below.

edit edit - So, ECS sent me the wrong belts. The correct belts for my pre-May 2008 are 6PK1067 and 6PK1460

Attached Images
  
__________________
2008 BMW E90 S65 6spd M3 Technology, Cold Weather, Premium Package Jerez Black MTEC H8 6W CREE LED Angel Eyes, Alarm retrofit

Last edited by jfirwin; 07-02-2016 at 06:08 PM.
Appreciate 0
      06-15-2016, 09:06 AM   #5
dparm
But doctor...I am Pagliacci.
dparm's Avatar
United_States
334
Rep
3,743
Posts

Drives: 2011.5 E90 M3
Join Date: Jun 2013
Location: Chicago, IL

iTrader: (0)

Quote:
Originally Posted by jfirwin View Post
This DIY really helped.

My M3 was built in Feb 02, so I made sure I had the right idler pulley. (Thanks, Theodore!)

While I was at it, I also replaced:

the accessory belt
the accessory belt tensioner
the accessory belt pulley
the A/C Belt
the A/C belt pulley
and the A/C belt Tensioner

ECS tuning part #2777259

BTW, you can get away with not replacing these, (except the belts) when you start hearing that squealing from under the hood (mine started around 85K miles) it'll be the idler pulley. I've always believed that you should replace parts that'll liable to go bad while you are at it. The pulleys all run on bearings, so they will wear out at some point.



Agreed, you should replace the belts and tensioners at the same time. Belts and tensioners have a finite life, and may be getting stressed if the idler pulley is on its way out.

I don't know what the change interval for those belts is, but 60-90k seems typical for most vehicles.
__________________
2011.5 AW M3 sedan ZCP
Appreciate 0
      06-18-2016, 11:44 AM   #6
Sean05
Putcha ang ganda...
Sean05's Avatar
Philippines
116
Rep
5,394
Posts

Drives: 08 MR E92 M3
Join Date: Feb 2010
Location: Los Angeles, Brea CA.

iTrader: (9)

Send a message via Yahoo to Sean05
Quote:
Originally Posted by dparm
Quote:
Originally Posted by jfirwin View Post
This DIY really helped.

My M3 was built in Feb 02, so I made sure I had the right idler pulley. (Thanks, Theodore!)

While I was at it, I also replaced:

the accessory belt
the accessory belt tensioner
the accessory belt pulley
the A/C Belt
the A/C belt pulley
and the A/C belt Tensioner

ECS tuning part #2777259

BTW, you can get away with not replacing these, (except the belts) when you start hearing that squealing from under the hood (mine started around 85K miles) it'll be the idler pulley. I've always believed that you should replace parts that'll liable to go bad while you are at it. The pulleys all run on bearings, so they will wear out at some point.



Agreed, you should replace the belts and tensioners at the same time. Belts and tensioners have a finite life, and may be getting stressed if the idler pulley is on its way out.

I don't know what the change interval for those belts is, but 60-90k seems typical for most vehicles.
I didnt change my belt when i replace the oulley thats because when i took out the belt it was almost the same condition as the new one i bought just dusty so returned the belt i bought... Also i was at 95k miles at the time of change
__________________
Appreciate 0
      08-14-2016, 06:21 AM   #7
RomanK
New Member
1
Rep
11
Posts

Drives: M3 Coupe E92 DCT
Join Date: Dec 2013
Location: Russia

iTrader: (0)

Hello guys... I don't understand how the belt should goes?

Under or over Power Steering?

What picture is RIGHT? Picture of engine or scheme picture?
Appreciate 0
      08-14-2016, 08:55 AM   #8
pbonsalb
Brigadier General
205
Rep
3,385
Posts

Drives: 08 E90 M3, 99 E36 M3 Turbo
Join Date: Feb 2011
Location: Concord, NH

iTrader: (3)

Quote:
Originally Posted by RomanK View Post
Hello guys... I don't understand how the belt should goes?

Under or over Power Steering?

What picture is RIGHT? Picture of engine or scheme picture?
BMW used both belt routings. One is for early cars, through the middle of 2008, and one is for later cars. I think the photograph of the motor is the early car and the diagram of the pulleys and belts is the later car. I think the belt that runs the AC and PS is two sided on the later cars, and one sided on the early cars.
Appreciate 0
      08-20-2016, 03:21 PM   #9
Theodore
Second Lieutenant
Theodore's Avatar
United_States
30
Rep
211
Posts

Drives: 2011.5 E92 M3
Join Date: Oct 2015
Location: Tampa Bay, FL

iTrader: (0)

Quote:
Originally Posted by pbonsalb View Post
BMW used both belt routings. One is for early cars, through the middle of 2008, and one is for later cars. I think the photograph of the motor is the early car and the diagram of the pulleys and belts is the later car. I think the belt that runs the AC and PS is two sided on the later cars, and one sided on the early cars.
Correct: For M3's built before 4/29/08 the belt is routed over the power steering pump (and under the idler pulley). M3's with build dates after 4/29/08 the belt is routed under the power steering pump (and over the idler pulley). This is because they changed the idler pulley design (see above posts for part numbers and pictures).

Last edited by Theodore; 08-27-2016 at 02:12 PM.
Appreciate 0
      11-26-2016, 07:13 PM   #10
Product
Registered
0
Rep
2
Posts

Drives: Alpine White E90 M3
Join Date: Dec 2015
Location: Texas

iTrader: (0)

I have an early 2008 m3 and that fan shroud is a pain to remove. The clips on the left and right sides of the shroud get hung up on the radiator hose connections. I do have the hoses unclamps. Any tips?
Appreciate 0
      11-26-2016, 08:45 PM   #11
Product
Registered
0
Rep
2
Posts

Drives: Alpine White E90 M3
Join Date: Dec 2015
Location: Texas

iTrader: (0)

Figured it out. You have to move the right side of the shroud out first before the left. Then it just comes out. Also the idler pulley (not tensioner) can be swapped without removing the fan shroud if you have small hands.
Appreciate 0
Post Reply

Bookmarks

Thread Tools Search this Thread
Search this Thread:

Advanced Search

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Forum Jump


All times are GMT -4. The time now is 01:39 AM.




m3post
m3post
Powered by vBulletin® Version 3.7.0
Copyright ©2000 - 2016, Jelsoft Enterprises Ltd.
1Addicts.com, BIMMERPOST.com, E90Post.com, F30Post.com, M3Post.com, ZPost.com, 5Post.com, 6Post.com, 7Post.com, XBimmers.com logo and trademark are properties of BIMMERPOST