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DIY: Do It Yourself
Post here to share or improve your wrench turning skills! All BMW E46 DIY tips, tales, and projects discussed inside. Learn to work on your car and know the right BMW parts you will need!

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Old 05-12-2008, 10:16 PM   #21
rix617
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take off the pulleys and see what they look like. if it looks like the one on the left, its mechanical, the right one is from hydraulic.
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Old 05-13-2008, 03:16 AM   #22
ssm1991
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Is there an easy way to know if you have a hydraulic or mechanical tensioner without getting down in there? I have 120k on my pullies and oddly none of them are making any sound as of yet. I am doing my water pump soon and figured I'd replace these as well.
The photo in the OP is the mechanical tensioner.

You can't get a replacement pulley for the mechanical tensioner anyway. There's no part number for it hence BMW doesn't sell it. You'd have to buy the whole hydraulic set if you want to change it.

For the hydraulic tensioner, the pulley is replaceable (11-28-1-748-131).

Last edited by ssm1991; 05-13-2008 at 03:21 AM.
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Old 05-13-2008, 06:23 AM   #23
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Thanks for the great info guys! I'll have to go check this evening and get the rest of the parts ordered
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Old 05-13-2008, 12:19 PM   #24
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Originally Posted by ssm1991 View Post
The photo in the OP is the mechanical tensioner.

You can't get a replacement pulley for the mechanical tensioner anyway. There's no part number for it hence BMW doesn't sell it. You'd have to buy the whole hydraulic set if you want to change it.

For the hydraulic tensioner, the pulley is replaceable (11-28-1-748-131).
You have to buy the whole mechanical set if you want to change it not the hydraulic set
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Old 05-20-2008, 10:03 AM   #25
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What exactly does the tensioner "squeal" sound like? In my car when the engine revs it has a sort of turbine-like sound. This just started recently.
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Old 07-01-2008, 12:23 PM   #26
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Light buzzing squeeling noise

Hi, I just had my belt tensioners and belts replaced. Everytime I start up the car I hear a slight buzzing/squeeling noise. This noise also happens at idle too. Is this possibly the belt tensioners? Are they too tight and need to be adjusted? The other thing I was thinking that it could be the alternator failing but a voltage test was run and all checked out ok. But if the coils in the alternator are failing it may be making the noise. Anyone any inputs on tweeking or adjusting the tensioners? Or could it be the belts themselves?
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Old 07-22-2008, 06:23 PM   #27
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I have the belts to change them out... but before i start, do you know what foot pounds of torque i should be using while in there? or should i just tighten without the torque wrench?
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Old 07-22-2008, 09:46 PM   #28
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Is this job going to fix this noise(in video)? Im 99% sure is coming from the pullies or the tensioner/ belt area. Advice is needed!!! Thanks

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Old 07-23-2008, 12:03 AM   #29
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Bump anyone
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Old 07-24-2008, 12:02 PM   #30
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Bumpity someone
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Old 07-24-2008, 12:08 PM   #31
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wish i could help you with that man. when was the last time you changed your belts? some suggests changing the mechanical tensioner if they need it when you're in there. i changed both belts yesterday. its an easy DIY: http://forum.e46fanatics.com/showthr...ight=belts+diy
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Old 07-24-2008, 12:20 PM   #32
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Belts and pullies were replaced no more than 2 months ago. Thats why i figured it was a tensioner or maybe a bearing
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Old 07-24-2008, 04:20 PM   #33
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if its really annoying and you think its obviously an issue that you cant resolve... ask a mechanic to inspect the noise... should be free. but some might charge you. good luck
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Old 07-25-2008, 05:48 PM   #34
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I have the same noise...had my mechanic to take a look at it and said I need the belt change..the idle pulley and the belt tensioner...
never heard of Idle pulley...is that the same as deflection?

I go to RealOem...and see 2 different pulley. Adjusting and Deflection....could the adjust pulley be the problem as well?
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6 Feet Under!....

to be continued......

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Old 07-26-2008, 10:38 AM   #35
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Quote:
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I have the same noise...had my mechanic to take a look at it and said I need the belt change..the idle pulley and the belt tensioner...
never heard of Idle pulley...is that the same as deflection?

I go to RealOem...and see 2 different pulley. Adjusting and Deflection....could the adjust pulley be the problem as well?
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6 Feet Under!....

to be continued......
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Old 11-11-2008, 03:45 PM   #36
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Belt tensioner& pulley OEM manufacturer

Hi, can anyone recommend or tell me if the manufacturer matters or if they the quality of the tensioners & pullys I am looking at are all the same?

I live in Canada so I preference would be to order from www.autopartsway.ca with their free shiping over $75.

Any other suggestions are welcome.

mfg: INA
www.bimmerspecialist.com/canada/parts/product_details/11281427252

mfg: ?
http://www.autopartsway.ca/autoparts...20Sedan~241030

mfg: Ruville
http://catalog.worldpac.com/marks/wi...Tension+Pulley
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Old 11-12-2008, 06:06 PM   #37
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I bought Ruville. I believe it's OEM replacement.
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Old 11-17-2008, 09:28 PM   #38
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Thanks, I ordered the Ruville parts.
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Old 11-18-2008, 10:48 PM   #39
SMBMW332is
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Thanks for this DIY, I need to replace the drive belt on my new E46 and I'm still waiting for the Bentley manual to show up.
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Old 12-04-2008, 02:23 PM   #40
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Is this any different in an auto?
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