Thoughts On Engine Whine

[schwin]

Originally Posted by rantarM3

Got the car back and all is well. They replaced the deflection pulley - part number 11-28-7-841-531. As for the proucedure, they removed the fan and PS & AC belt, started the engine to isolate the bad pulley, hand spun each idler pulleys and confirmed the problem pulley. Grease was found to be leaking out of the bearing. Quite happy with the work that was done.

I couldn't find a picture of the deflection pulley or the product at ecs. That's not the idler pulley right?

[rantarM3]

Originally Posted by schwin

I couldn't find a picture of the deflection pulley or the product at ecs. That's not the idler pulley right?

It is the idler pulley - it's the only pulley not attached to a tensioner or driving an accessory. It sits a little below the oil filter housing and next to the water pump pulley.

Look at the second picture in this thread and you'll see what it looks like:

http://www.m3post.com/forums/showpos...69&postcount=1

[dry87]

Is this your car sound like this? Is this come from pully?

[E90JR06]

Sorry to bring this back from the dead. But my 2008 M3 is having the same noise as dey87. Any idea what this could be? Tensioners/idler pulleys? My car just hit 70K miles

[Chromey]

Bringing it back. The last YouTube video is similar to what I’m hearing all of a sudden.. 09 e93 with 43km only. Is there a answer to the sound in the vid?

[nyc_dude]

https://www.ecstuning.com/b-genuine-...1287837898kt2/

This ECS Tuning page shows all the M3 S65 parts. 2 belts, 2 hydraulic tensioners, 3 idler pulleys with internal bearings (that could fail).

I have the supercharger whine, but also have an oil filter housing leak at 190k miles. So I have to do this belt kit too. $$$ to replace a $15.00 dollar gasket.

An indie BMW shop should be able to install all the parts. You have low mileage, but the
rubber does degrade, along with bearings on the pulleys, and hydraulic tensioners over time. Replace them all...should cost over $1k unfortunately.

No rush and can wait til the snow melts.

Speaking of Rush. Godspeed Neil Peart!!

Good Luck,


Cheers

[schwin]

Originally Posted by Chromey

Bringing it back. The last YouTube video is similar to what I’m hearing all of a sudden.. 09 e93 with 43km only. Is there a answer to the sound in the vid?

Mine ended up being the idler pulley. I bought it from ECS, but then also did all new belts to kill two birds with one stone.

Also consider FCPEuro for a very solid warranty ;P

Andy

[Chromey]

Cheers guys , over 1k ouch..

[Ccieszyn]

I'm trying to chase down this whine/whir too. It sounds a lot like dry87's video, but seems to disappear or at least mostly fade away once the car gets nice and warm. I would think that a pulley noise would be constant, but I could be wrong. I've replaced the idler pulley, but no luck. Has anybody else had the issue only when the car is cold?

[S65 SCHNAUZER]

Originally Posted by Ccieszyn

I'm trying to chase down this whine/whir too. It sounds a lot like dry87's video, but seems to disappear or at least mostly fade away once the car gets nice and warm. I would think that a pulley noise would be constant, but I could be wrong. I've replaced the idler pulley, but no luck. Has anybody else had the issue only when the car is cold?

are you running an aftermarket underdrive pulley?

[Ccieszyn]

Not that I know of. I didn’t see any mention of one in the prior owner’s notes.

[tbuck]

Originally Posted by Ccieszyn

I'm trying to chase down this whine/whir too. It sounds a lot like dry87's video, but seems to disappear or at least mostly fade away once the car gets nice and warm. I would think that a pulley noise would be constant, but I could be wrong. I've replaced the idler pulley, but no luck. Has anybody else had the issue only when the car is cold?

I have had them go both ways, so if you are hearing something like that from the front of the engine just figure that's it. I had one on my E46 barely make any noise before it grenaded. I always figure these are simple and cheap insurance.