Xoutpost.com - Screeching sound on cold start (Video)

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Quote:

Originally Posted by trader4 (Post 1048649)

When I put an 06 3.0 into RealOem, it shows two separate diagrams,
one for cars with hydraulic tensioner, one for cars with mechanical.
Did you see that separate diagram? So, it looks like you can't tell
from there which one it has, unless putting VIN in somehow narrows
it down. I guess you'd have to actually look at it to know or just order
the hydraulic one.

Assuming it's actually hydraulic, you don't need the whole tensioner,
11287838797, just the pulley. If you do get the whole tensioner,
then you don't need the pulley, it comes with it. The weird part is
that if you look at the prices, buying just the tensioner part costs a lot
more than buying the whole tensioner with the pulley.

Just took a peek and it's hard to see with the fan in place. But I noticed the mounting bolt cap protruding (pic attached) which looks like its part 19 on realOEM. (RealOEM.com - Online BMW Parts Catalog). The mechanical tensioner does not seem to have something like this. Does that look right?

is it just me or does that belt not look routed correctly?

Quote:

Originally Posted by trader4 (Post 1048713)

IDK, can't tell from the pic.

Oh well I'll just order the hydraulic pulley for now. Thanks for all the help.

Quote:

Originally Posted by jgold47 (Post 1048729)

is it just me or does that belt not look routed correctly?

That's a top down pic. Is it even possible to incorrect route the belt and have the car start up and run? I hope not!

It's possible, but I just got home and looked and its fine. Something was throwing me off.

another step would be take the belts off and check each pully, (alternator,power steering,waterpump, and tensioner pullies .

Quote:

Originally Posted by puddinboo (Post 1048747)

another step would be take the belts off and check each pully, (alternator,power steering,waterpump, and tensioner pullies .

The sound is intermittent so not sure if I will be able to recreate the sound by hand. I have already ordered the since they were due to be replaced anyways. But if there are some tricks to verifying them by hand I'll do it before I replace them. Thanks

just check for play there shouldn`t be any.

Just wanted to let you all know that I completed this repair yesterday and no more screeching noise. I replaced the ac belt tensioner, deflector pulley, hydraulic tension pulley and both belts using this excellent DIY:
http://www.xoutpost.com/bmw-sav-foru...ent-3-0-a.html

Some notes:
1.) The DIY lists T50 to loosen the ac belt tensioner but I found out it's a T60. I did not have a T60 but was able to loosen it with a T55.
2.) For removing the ac belt tensioner there is only one bolt that needs to be removed after the belt is off. Not sure what the upper bolt in the DIY is for?
3.) All of the old pulleys spun freely unlike the new pulleys which had a little resistance to them. Before starting the repair I thought it would be opposite where the old pulleys would not be turning freely at all and jammed up causing the screeching sound.
4.) Putting the fan shroud back was a little tricky (took a couple of tries). There are clips on the radiator that the fan shroud slips into and getting them all in with one hand while holding the fan with the other hand was a bit of a circus (at least for me).

Overall this was an easy-medium DIY with the proper tools. I must have spent more time looking for and retrieving a socket, that I dropped while tightening the defector pulley, than the actual pulley and belt replacement.

Thanks for all your help.