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Discussion Starter #1
2008 E60 / n52 / 528xi - 62k miles

I discovered that my serpentine belt is becoming misaligned. this seems to be a common problem. It seems that the tensioner wears and causes the issue.
I have done some research on the topic including this forum and found so many differing results.
I intend to replace the idler/tensioner/belt.

For some reason the idler is not often mentioned as a replacement, and torque specs are difficult to find, so here's what I have:

I need -
t60 torx to de-tension the belt
e14 socket to remove the tensioner bolt
a new AL bolt
Tensioner torque= 25nm / 18.5 ft lb + 90degrees
idler bolt torque= 40 nm = 29ft lb

I got the entire kit from AMZN :thumbup:

Do I have the correct parameters??
 

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2006 530xi 6 MT
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4,400 Posts
a new AL bolt
Tensioner torque= 25nm / 18.5 ft lb + 90degrees
idler bolt torque= 40 nm = 29ft lb
The quoted is correct (for N52, at least).

As I recall, it took me a long time to find at least one of the torque specs and I wrote them down in my Bentley manual.

Don't remember the socket sizes.
 

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2008 E60 / n52 / 528xi - 62k miles

I discovered that my serpentine belt is becoming misaligned. this seems to be a common problem. It seems that the tensioner wears and causes the issue.
I have done some research on the topic including this forum and found so many differing results.
I intend to replace the idler/tensioner/belt.

For some reason the idler is not often mentioned as a replacement, and torque specs are difficult to find, so here's what I have:

I need -
t60 torx to de-tension the belt
e14 socket to remove the tensioner bolt
a new AL bolt
Tensioner torque= 25nm / 18.5 ft lb + 90degrees
idler bolt torque= 40 nm = 29ft lb

I got the entire kit from AMZN :thumbup:

Do I have the correct parameters??
i will be doing the same thing soon. can you post the link to the kit on amazon?
 

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FCPEuro is a good site, as well as PelicanParts to find this stuff. Good info on the torque specs, I just did my belt, tensioner and idler pulley on my N52 530i. :thumbup:
 

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Discussion Starter #7
Update:
I did the replacement today: -Tensioner, pulley, and belt-
A word of advice - remove the fan assembly - it is the only way to go.
The fan is easy to remove but tricky.
I did the job with my brother's assistance in ~2hrs.
 

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Update:
I did the replacement today: -Tensioner, pulley, and belt-
A word of advice - remove the fan assembly - it is the only way to go.
The fan is easy to remove but tricky.
I did the job with my brother's assistance in ~2hrs.
any advice/pointers on removing the fan assembly?

I just ordered the contitech kit and will tackle this over the weekend if it isnt so bloody hot
 

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2006 530xi 6 MT
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I left the fan in when I changed mine. Took the fan out in wife's X5 when I did that one.

Figuring out how to get the fan out is all the work :)

As I recall...

Unhook the big-ass electrical connector.
Move a small hose out of the way - you'll also need a new small hose clamp unless someone has already been there.
Left side (driver's side) there is a thing that flips out about half way down. It sits flush with fan assembly when installed and flips back, pointing toward firewall, when released.
Right side (passenger side), there is a springy thing about half way down. You have to hold it down with a larger size flat blade screwdriver and then pull the assembly up and out.
When you out it back in, make sure the stakes fit in their holes.
 
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