Serpentine belt

[604BMWX5]

Hi Guys
I have a 2012 X5 3.0 and the serpentine belt got shredded
I tried installing a new one, but i can't get it to fit, the belt seems a little short
the length on the belt shows 28mm x 1490 mm
Any tricks to get it to fit appreciated

[andrewwynn]

Do you have the tensioner pinned opene with the locking pin so you can take your time?

If so I've found with my 35i i have to get the belt onto all the pulleys with lips first then over a smooth pulley last. Also, it's pretty easy to invent an alternate path for the belt are you 100% sure you're going the right way?

[604BMWX5]

Thanks for the info, i will try again by locking the tensioner pin, also i believe i am putting the belt on correctly, i started at the bottom crank pulley and tried to finish at the alternator, just couldn't get it over its pulley lip
i am first going to call dealership and see if they can give me the length of the belt and see if its different from the one i got from the local parts store

[andrewwynn]

Yeah I've fought a few and had a hard time if i did any pulley with a lip last. Usually either idler pulley or tensioner pulley last.

I've also had a problem with the belt getting caught on the engine block behind the crank pulley without realizing

[604BMWX5]

Yes i had all those issues too, finally got it on by finishing it with slipping it on to the smooth pulley last
Thanks for the tips

[604BMWX5]

My tensioner is moving quite a bit after i installed the new belt, could this be the reason my belt came off, should i change the tensioner too or is this normal

[andrewwynn]

I lost a few belts before i replaced the tensioner. I suspect pulsed (pwm) load on the alternator is causing tugs that wobble the tensioner.

A knock off tensioner still shook a lot and oem was much better.

[604BMWX5]

Now it has thrown a check engine light, not sure if its connected to the belt issue
P112F
P0300
P0301
P0302
P0304

Any ideas

[ard]

If you wanna get freaked out, google "BMW N55 serpentine Belt Ingestion"

[604BMWX5]

I was afraid of this because as soon as my belt got shredded i got the P0112F straight away
Looks like I'll have to call my indy tech to check it out, youtube is showing a special tool is needed to take out the front main seal, does anyone know if this is correct or is it a DIY