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BMW 3-Series (E90 E92) Forum > E90 / E92 / E93 3-series Technical Forums > Mechanical Maintenance: Break-in / Oil & Fluids / Servicing / Warranty > Replace Serpentine belt alone, or Tensioner, Upper & Lower Pulley too?



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      02-22-2018, 06:44 PM   #1
MrSteak
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Replace Serpentine belt alone, or Tensioner, Upper & Lower Pulley too?

2008 E92 just hit 90k miles and I'm having my indy replace OFHG & VCG due to a slight leak. Paranoid about possible Serpentine belt damage from the leaks, I'm having them put a new belt on too.

Do I need to replace the Tensioner, Upper and Lower Pulleys also?

Any other preventative suggestions?

Thanks!
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      02-22-2018, 07:01 PM   #2
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Why not have them check the pulleys while the belt is off?
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      02-22-2018, 08:00 PM   #3
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Quote:
Originally Posted by TheeGovernor View Post
Why not have them check the pulleys while the belt is off?
Makes sense.

Just didn't know if there was a consensus on replacing pulleys WITH the belt or if replacing pulleys is necessary.
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      02-23-2018, 04:01 AM   #4
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Replace as preventative measure and be done with it. Best to do it now than to figure later on the tensioner and pulley are bad
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      02-23-2018, 01:01 PM   #5
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FWIW when I replaced my tensioner at 100k as a regular maintenance item, it felt less than half as strong as the new one. But the belt was still in good shape and riding straight on the pulleys.
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      02-23-2018, 02:01 PM   #6
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I did mine at 300,000. It was still in good shape. The bearing had a little play in it, but who knows when it wore in to that level. The tensioner pulley (not the entire spring assembly) is separately available; it's one of the idler pulleys on the Z3 M44 engine.
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      03-15-2018, 09:00 AM   #7
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I just replaced my tensioner only rather than the idler pulleys at 90K miles. The bearing in the tensioner was bad. When I rotated the idler pulleys they were fine still. If those weren't $50 a pop I probably would have gone ahead and switched those out too.
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