BMW 3-Series (E90 E92) Forum > BMW E90/E92/E93 3-series General Forums > Regional Forums > UK > UK Technical Forum > The case of the mysterious squeal... e90 330d... solved

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      09-07-2019, 05:32 AM   #1

Drives: 330d e90
Join Date: Jul 2012
Location: Costa del Sheffield

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The case of the mysterious squeal... e90 330d... solved

Hello just thought Iíd post in here regarding my mysterious squeal... e90 330d with m57 engine
About two years ago, I replaced the belts, pulleys and tensioner. Shortly after that, started getting a squeal in start up, and then more recently a rotational squeal which varied with speed, and went away when the engine was warm.
In the original maintenance activity, I used BMW genuine tensioner and pulley, a Gates ac belt and a Dayco belt from ECP.
When this squeal started, I thought ďit canít be anything Iíve just replaced as itís all new, it must be another pulley/alternator, right?Ē Wrong.
Fast forward two years, 1 child later and Iíve had enough of the squeal, quite frankly itís embarrassing every time I start the engine and itís getting on my nerves. Read a few forum posts on here. Fan out, belts off, replace the dayco (lowest priced part)... replaced with a more expensive continental conti tech serpentine belt.
Nervously start the engine... no noise. Fixed. The dayco belt is smooth on the back side, the continental belt is rubberised/grippy on the back.
Morale of the story, buy cheap, buy twice. Sure Iíve read that in this forum before...
Appreciate 1


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