CL55k Belt Squeak on Cold Startup...ABC Pulley?
 

Do you guys think it' just the serpentine belt or could it be the ABC pulley as well? I've attached a youtube vid of what it sounds like (listen about 20 seconds in).

It only squeaks on a cold startup. Once the car is fully warmed up it goes away. I recently had a coolant issue, and believe some coolant may have gotten on the belt. The sound only appears to be coming from the ABC area.

Thanks in advance!

http://www.youtube.com/watch?v=AyWxAa4jbaI

By the way, I sprayed some WD-40 on the belt away from the pulley and the sound stopped for a few seconds, then resumed.

I had this same issue and lived with it for several months. I told a friend whom is a MB Tech and he recommended taking a wire brush and "De-glazing" the back side of the belt and all smooth pulleys.

Once I did this, carefully with the engine running, the sound went away.

Might be worth trying and seeing if this fixes your sounds.

Thanks for the reply! Already bought a new belt, so hopefully that a thorough cleaning of the pulleys will do the trick!

can you give a little more detail on this process? I'm not sure quite what you mean by "de-glazing" but I def want to try this...

The squeak sounds inconsistent. OCKlasse, does the squeaking go away when you turn steering wheel and reappear right after?

Hi, alternator may be charging more at start up, but i think you have other issues. Any antifreeze or other contaiments on the belt can enhanse slip. A new belt is a good first gess.

Hey, yeah I did get some coolant on the belt, so it's being changed with this week. :y

Just gets louder with acceleration. Turning the steering wheel does not affect it. Completely goes away when the engine fully warms up.

Had this on my SL55 - just ignored it - would go away when it heated up - I think every single 55 has this problem at some stage.

Had the same noise. I lost count whether if it was the SC idler pulley, or main idler, tensioner or the ABC pulley. BTW the ABC pulley is replaceable and there is a separate part number. Some noises go away when it's fully warmed up but some noises stay but I think it's the main S/C clutch making the sound now. Oh well.

Thanks. I'm getting the new belt put on this week. We shall see if that alleviates the issue.

Love the wheels and the drop! Module or links? And that grille is starting to grow on me :y

Modified factory links :)

The grille is growing on me, too. It wasn't my choice...

Replace both belts and the plastic idler pulleys whether they seem ok or not. Spin the other pulleys with the belts off to see if they make noise. If they do replace them.

Keep the old parts and throw them in a box of spares in the trunk.
:y

I have exactly the same squeak on cold start, did it help since you change new belts?

Not yet! My tech had time to do other maintenance work for me, but we have not gotten to the belt yet. Hopefully within the next week or two I can finally get this done!

Hey I have the exact squeak. I sprayed some grg door lub and it went away. I usually spray every 2 weeks.. Idk what it is. It's the pulley for sure. No biggy

Hello...........
 

Though I do not own the same vehicle............ I had the same squeak on my 2011 ML550, It was only on start-up and it went away after 3-4 minutes..I brought in the vehicle last week and it was the V-Belt....They applied belt dressing and the squeak is gone..Part# 000-989-84-51 SILC/BELT PASTE. I hope that helps....