Glyn M Ruck

Tell your mechanic once again to start the car before fitting the belts & then again after fitting them. You might still have a noisy pulley.

LightDragon

but Glyn, if i replace my alternator with a brand new, why should i start it before fitting the belt ?

Carsy

Light Dragon,

If the noise is not apparent with the Aux belt removed then it must be coming from one of the auxilliarys.

Taking a guess that it is the alternator may not be cost effective. The noise may be coming from any auxilliary.

With a noise as loud as you have any decent mechanic with a stethescope would be able to diagnose which item run by the aux belt the noise is coming from. It is simply a matter of going to each on numerous occasions for the noise comparison.

I would not be putting in a new alternator until I was sure that it is the offender. Tensioners cause a lot of problems & probably wear our first. followed by idler pulleys, air conditioning compressor & the belt itself.

Look after your back pocket & proceed step by step. The mechanic will only be too happy to try things at your expense. Sounds as if he needs to have a little gentle pressure applied or go to someone else.

LightDragon

Carsy friend, the noise goes away when removing the right aux belt. if the right aux belt is on and remove the left one the noise is still there. now, the right aux belt connects to the s/c the tensioner and the alternator. the s/c and the tensioner were both replaced with brand new and only the alternator remains to be replaced - guessing that's it, causing the problem. I so much wanna end this adventure tomorrow, pls pray for me as well hehe

Carsy

Understood. You have it in hand. No praying , just keeping fingers crossed!!

Glyn M Ruck

OK - you never told us you had replaced the belt tensioner which is why I suggested you take the good practice of starting the cars sans belts first.

LightDragon

ok here's the deal.... afterr alllll this time. i bought a new c-class. i removed the larger crankshaft pulley+headers from the old one and installed them on the new and vice versa(the normal exhausts from the new transfered to the old one). THE NOISE FROM MY OLD C-CLASS HAS DISAPPEARD!! WTF!!! and i cant define if im hearing the strange noise on my new one or not, my mind messes with me... why has the strange noise disappeared from the old one new its back to normal ?????

LightDragon

I finally figured it out... ITS A ****IN MANIFOLD LEAK! THEY ARE CRACKED SOMEWHERE AND THE SOUND I HEAR IS ESCAPED AIR! DAMN! I VE BEEN THROUGH ALL THIS PAIN AND EXPENSES WHILE THE SOLUTION WAS SO SIMPLE! ****IN MECHANICS THEY SUCK! Thank God i found out what happened and ended up with a better w203, the only thing left is sell my old one and Ill be right there I started

Glyn M Ruck

Oh dear! - Anyway, pleased it's diagnosed at last

custom c280

well my check engine light was on i forget the code but it turned out i had to chain my balance shaft. it was making a wierd sound then the check lightcame on so i would get it checked out cause it cost me 2500 to fix my balance shaft ill post up pics and show you how intense it is its about 22 hours of work

Glyn M Ruck

Yes - this is a known problem on some M272 engines. They had sintered sprocket wheels on the balance shaft drive. Replaced with good old steel ones & all is now OK.

custom c280

i wonder if mercedes is gonna do a recall on those engines

Glyn M Ruck

They seem to have a fix with no argument attitude at the moment.

custom c280

what do you mean fix with no arguement attitude