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Old 02-25-2011, 05:22 PM
G. P. Burdell's Avatar
G. P. Burdell G. P. Burdell is offline
Rambling Wreck
Location: Southeastern U.S.
 
Join Date: Jan 2006
Posts: 1,694
Mein Auto: E46
The Gates technical bulletin posted by cn90 states that hydraulic tensioners are "mainly used on applications with high loads and/or angular vibrations, where a mechanical automatic tensioner can not provide sufficient damping or tensioner movement." It may be that the mechanical tensioner, while less expensive for BMW to install at the factory, wears its pulley bearings out faster and becomes noisy because it's less capable of handling the loads of the belt drive system compared to the hydraulic tensioner.

Last edited by G. P. Burdell; 02-25-2011 at 05:25 PM.
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