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E46 M3 (2001-2006) Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006.


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Old Thu, Oct-08-2009, 02:35:48 PM   #11
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Old Thu, Oct-08-2009, 02:53:39 PM   #12
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Here is a great DIY for a 330, but i'm sure there are some differences for our m3's. You should take some pictures along the way and point out the differences for the rest of us if you get a chance.

http://forum.e46fanatics.com/showthr...belt+tensioner
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Old Fri, Oct-09-2009, 12:01:30 AM   #13
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Here are some pics of when I did it.
First to come off is the AC belt.
Put a socket on the tensioner pulley, spin it and slide a nail/drill bit/screw driver etc in the little hole to hold it loose. You don't need to release it until both belts are back on.

Then do the same thing to the accessory belt tensioner pulley:

(You do not need to take the pulley cover off, I was just curious...)
Switch the belts for new ones and release the pulleys one by one by pulling out whatever you used to hold them in the loose position.
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Old Fri, Oct-09-2009, 12:16:11 AM   #14
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It's the same thing whether you do it from the top or bottom.
To do it from the top you take off the fan and shroud. I didn't have the fan cutch tool, so I didn't even try.
Here's how to get access from the bottom:
Take off the plastic underbody shield, there are 3 8mm bolts on the back of it:

I don't remember if there are any more bolts in the front, I think it just slid out.

Now you have access to the pulleys, but it's a bit of a weird angle:

You can still work, but it's MUCH easier to take down the oil cooler. It's held on by only 2 screws - one on each side:



I think they are T30 or T25 torx screws, they come out quickly and the cooler just hangs down, now you can start on the tensioners with all the clearance you might need.

All together a 10 minute job.
I hope these help.
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Old Fri, Oct-09-2009, 10:41:35 PM   #15
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Great, looks like I will be doing this from the bottom as well.

E46Fanatics DIY is done from the top with removal of the fan, don't wanna do that.

Thanks!
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Old Wed, Oct-14-2009, 11:29:48 PM   #16
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Thanks for the pictures, that will make it much easier when it comes time for my belts.
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Old Sat, Oct-24-2009, 09:30:43 PM   #17
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How did you get the accessory belt off if you didn't take off the fan?

Also my tensioner pulley was different and I ended up popping the cover and using an 8mm hex wrench to de-tension the pulley itself, but you can't seem to remove the belt with the fan still attached.
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Old Sat, Oct-24-2009, 09:34:55 PM   #18
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My tensioner is the same way. You should be able to undo the belt and then get it around the fan blades. However if you have the right wrench, it's a lot easier to just remove the fan.
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Old Sun, Oct-25-2009, 01:11:18 AM   #19
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Quote:
Originally Posted by tony(topaz,SMG) View Post
My tensioner is the same way. You should be able to undo the belt and then get it around the fan blades. However if you have the right wrench, it's a lot easier to just remove the fan.
I got through it exactly as you said. I was able to slide the belt around the fan and down between the fan and radiator without removing the shroud and fan.

The big difference is that it seems that some vehicles have a hydraulic style tensioner for the accessory belt. This is different than the pictures above and you actually have to wrench the pulley itself to de-tension it.

I wanted to include a few more pics that I would've found helpful.
This is the oil cooler removed. It is easy and a must to have room.


This is showing my wrench with an 8mm hex socket that easily de-tensioned the pulley. Note, you must pop the dust cap off the pulley to get the hex nut exposed. I used a flat head screwdriver.


I didn't need to fix it down, I just pulled on the wrench, then slid the belt off the pulley and it was loose. Just reverse the process to remount the belt.

The fan totally threw me for a loop, but you really can just feed it between the blades and the shroud. I rotated it gently as I did to get all of the belt between the fan and radiator and it dropped out easily. Here is a picture just showing where you can feed the belt.



Hope this helps


-Evan
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Old Sun, Oct-25-2009, 01:15:42 AM   #20
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This is the mechanical style:


And this is the hydraulic style:
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Discussing DIY drive and AC belts in the E46 M3 (2001-2006) Forum - Engine: S54 - Max Hp: 333 hp at 7,900 rpm / 262 lb/ft at 4,900 rpm
Total Produced: 45,000+ - Years Produced: 2001 to 2006. at BMW M3 Forum.com (E30 M3 | E36 M3 | E46 M3 | E92 M3 | F80/X)