Tighting torque for tensioner pulleys

[Anton CH.]

Guys can't find this anywhere in the Benteley. What do you torque those pulleys that are attached to tensioner down to?

Yeah I know you don't need a torque wrench for this type of job but I like to do everything by the book.

[632 Regal]

just got my pully today, Im not going to measure how tight but as a guess id say 35~40 ft lb

[Anton CH.]

You going to replace the tensioners as well Jeff?

[632 Regal]

just the worn pully, sounds real bad today when I ran to the post office, wondered if I would make it back. I will inspect more stuff when I get in there tomorrow cause I am going to freshen the AC belt too.
You going to replace the tensioners as well Jeff?

[yaofeng]

Guys can't find this anywhere in the Benteley. What do you torque those pulleys that are attached to tensioner down to?

Yeah I know you don't need a torque wrench for this type of job but I like to do everything by the book.

Look at the bolt size. IFRC it is 8 mm. And then look at the grade on the bolt head. Most likely it is grade 8.8. Then use the torque seting table.

[632 Regal]

uh-ohh the smaller idler is wasted! Looks like its E31 weather for a few days...hmm the AC idler is the same thing, the ol switcheroo is what Im going to do.

[Boone.Msi]

where'd you get your pulleys? Are there aluminum ones available or just plastic? I'm replacing my Rad, maybe its a good idea to replace these as well?

[Anton CH.]

where'd you get your pulleys? Are there aluminum ones available or just plastic? I'm replacing my Rad, maybe its a good idea to replace these as well?

They are plastic. Take off the belts and spin them. If they catch or make noise--replace.

[Boone.Msi]

Sorry to stray off-topic, but i believe the idler pulley is catching, the pulley on the bottom right passenger side will spin then stop suddenly, followed by a change in engine speed(sound like a catching idler pulley to you?)

The bearings are in the pulley itself correct?

Another question i have is which one to get? I believe they are standard 80mm but on BMA they have a 70mm option? take a look:

http://bmaparts.com/item.wws?mfr=INA&sku=BMW055126&price=39.01&orpartno=1354550&cookieID=21T0Y3YJG21T0Y45L9&drillid=8&image=http%3A%2F%2Fcatimages2%2Esophio%2Ecom%2Fweb app%2Fwcs%2Fstores%2Fservlet%2Fimc%2Fimages%2Ftn%2 F11281731220%2Ejpg

[Anton CH.]

Yes, these pulleys have the bearings built-in.
http://realoem.com/bmw/diagrams/c/j/6.png

Which one are you looking for?

The idler is 70mm, deflection pulley 80mm.

[Anton CH.]

P.S. Autohaus has your parts cheaper. I wouldn't deal with BMA as they screwed me too many times.

[632 Regal]

You need to look at which one is bad, there are 2 70mm ones, ones for the AC and the other 80mm is on the same bracket thing as the tensioner with the 70mm

[Boone.Msi]

seems like the bma kit comes with two, wouldn't i just replace both? Il start taking everything apart this weekend, see if i can tell by hand spinning it.