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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 > N52 Idler Pulley/Belt Tension Torque



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      02-27-2013, 03:05 PM   #1
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N52 Idler Pulley/Belt Tension Torque

Replacing these along with my belt, Bentley manual dosen't have the torque for these anyone know?

I searched online I think the belt tensioner is 25NM (18ft lbs) plus 180 degrees angle after that.
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      02-27-2013, 09:39 PM   #2
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That's correct
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      02-28-2013, 12:33 AM   #3
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Thanks what about the idle pulley?

I think I have older 2007ish copy of TIS laying around, hate to have to install it just to look up some dam torque value!
Will update post when I get it running.
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      02-28-2013, 01:00 PM   #4
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Straight from TIS, those numbers mean a specific section of the Torque Specification Document.

This is ONLY for N52 engine, the 335i N54/N55 might be different.

Torque to 18 ft pounds for the tensioner, THEN torque it 90 degrees ignoring the torque. This is known as Torque to Yield or Torque to Angle, and I believe streches the bolt and allows for more consistency then if they just gave you a flat torque number.

No where in TIS did I find the specs for the idler pulley, but the idler pulley on the alernator is 40nm or about 30ft lbs so I'm going with that.






Good thing I looked it up, 180 degrees did seem tooo high.
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