[mightbaal]

Ok well here is my belt that idk why it was toasted the belt some plastic pulleys looked messed up and this shit was wound up on every plastic pulley there is on the car nothing was pulled from the harmonic balancer pulley. They youtube video is what makes me worry so much......

[mightbaal]

Got all pulleys off man that bottom one was a PITA with the air intake to turbo thing in the darn way ugh moved it all over the place lol


Also the ribbed part of the belt goes over a smooth pulley? Am I seeing this right? Top pulley labeled 2.....?

[PichaDis11]

Originally Posted by mightbaal

Got all pulleys off man that bottom one was a PITA with the air intake to turbo thing in the darn way ugh moved it all over the place lol


Also the ribbed part of the belt goes over a smooth pulley? Am I seeing this right? Top pulley labeled 2.....?

That pulley is actually not smooth. the one below is.

also look to see if the belt or parts of did not get dragged in at the crank shaft seal.

[gabylonfive]

check your power steering pulley for damage. alot of the time this is caused by that pulley contacting the subframe, shredding the belt immediately or over time as the jagged edge tears into the belt. as mentioned above, there's a chance that the shredded belt can tear the front crank seal off the block, resulting in belt pieces in your oiling system. bad news.

[mightbaal]

If it did contact the subframe how do I prevent that from happening again?

[mightbaal]

Also this looks like a smooth pulley this is the tensioner...

https://www.amazon.com/gp/aw/d/B00HC..._st_dp_summary

[gabylonfive]

Originally Posted by mightbaal

If it did contact the subframe how do I prevent that from happening again?

aside from swapping out your front subframe with the updated part from BMW, the general consensus is upgrading to the 335is motor mounts can help prevent this. I upgraded both mounts to the 335is part and haven't had any issues up to this point. It's been a little over a year since I replaced them, so far so good.

[gabylonfive]

Originally Posted by mightbaal

Got all pulleys off man that bottom one was a PITA with the air intake to turbo thing in the darn way ugh moved it all over the place lol


Also the ribbed part of the belt goes over a smooth pulley? Am I seeing this right? Top pulley labeled 2.....?

both pulleys on the tensioner are smooth, so yes the ribbed side of the belt will loop around the smooth upper pulley.

[mightbaal]

No damage to the pulley on the power steering pump up and running atm

[Wires]

That usually means that a pulley is wobbling, or the bearings are bad in the idlers (wobbling).

Had a similar issue with the supercharger on my truck when the pulley came loose.

[Maniac0908]

Originally Posted by gabylonfive

aside from swapping out your front subframe with the updated part from BMW, the general consensus is upgrading to the 335is motor mounts can help prevent this. I upgraded both mounts to the 335is part and haven't had any issues up to this point. It's been a little over a year since I replaced them, so far so good.

Part #? Does it fit xi?

[Kevinl]

My belt shreeded as well with the updated front subframe the cause of mine was a siezed alternator clutch pulley

the shop in that video obviously know nothing about n54 belt failure because it probably almost never is caused by the belt itself

[ilicboris]

Originally Posted by Maniac0908

Part #? Does it fit xi?

From the short amount of time I had to look this up. the xi cars might not have this issue due to a different subframe.