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Old 09-02-2011, 11:41 AM
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bluebee bluebee is offline
Seek to understand,^Value
Location: San Jose, California
Join Date: Mar 2008
Posts: 25,236
Mein Auto: 02 BMW 525i M54 auto 130K
Originally Posted by thecushion View Post
2 belts is what needs to be changed.
If you're going to change the belts, you may as well consider replacing the tensioners & the idler pulley.

For details, do a thread search for 'tensioner' in the bestlinks.
- How to tell if you have mechanical or hydraulic belt tensioners (1) & how to switch from mechanical to hydraulic (1) and what is the difference between the two types (1) (2) & how to rebuild your hydraulic tensioners (1)

Here is more information about the alternator:
Common questions which need to be answered BEFORE you do an alternator and/or drive belt system overhaul:
- 1st: Physically, determine what type of tensioners you have (1)
- 2nd: Physically, determine exactly what alternator you have (1)
- 3rd: Determine which parts you need to buy for a complete drive belt system overhaul (1)
- 4th: Do the alternator and drive belt system DIY (belts, tensioners, pulleys, rollers, alternator) (1)

Alternator and Belt Drive DIYs:
- Removal instructions for the alternator & drive belt system of a 2002 525i
- Removal instructions for the fan shroud of a 2002 525i
- Alternator and Belt Drive DIY (1) (2)
- How to tell if you have spring-drive or hydraulic belt tensioners or both (1)
- How to diagnose noises coming from the drive belt system (1)
- One users' example of total electrical failure (AAA towed away) alternator repair (1) (2)
- Video of cold idle engine squeal (1)
- Recommended parts list for a complete belt drive system overhaul (1)
- How to make your own BMW special cooling & belt drive system counterhold tools (1)
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