View Single Post
      05-27-2019, 07:10 AM   #30
juld0zer
Lieutenant Colonel
Australia
480
Rep
1,600
Posts

Drives: Prev 135i 7DCT, Now 130i 6sp
Join Date: Jul 2016
Location: 2153

iTrader: (0)

Quote:
Originally Posted by Tallicia View Post
Sidenote, I also just recently started chasing a squeak - serpentine belt, deflector pulleys, and tensioner and over running alternator got it.

But the surprise kicker was that I had to floss the crank pulley/harmonic balancer with twine. I was measuring for some bypass length belts and noticed the twine was extremely nasty. I found way too much grime accumulated in the CP/HB so I flossed it till the twine was clean and no more grime in any of the v groove channels.

Started up with new belt extremely quiet. almost too quiet. It's nice.
A lot of folks (even experienced guys) downplay the importance of having clean pulleys. Fact is, belts wear down on the sides of their ribs mainly. As the ribs wear, they get thinner so the peaks of the ribs eventually can touch the valleys of the pulley ribs, depositing rubber. Slap on a new belt and since the pulleys are also slightly worn, the new belt's ribs sit lower and closer to the pulley's valleys, elevating the belt and causing the ribs to not make proper contact.

Leaky oil filter housings melt the rubber belt, which adds to this problem.
Appreciate 0