[Breach]

Hey guys. Really strange issue. Replacedbelt tensioner and belt with OEM parts. Bolts torqued to spec (38 Nm), belt properly routed, and all seems to work fine except that... On one of the pulleys the belt wanders too much to the inside, there may even be 1 mm overhang. Redid the job, same issue. Strange thing is that with the old tensioner and belt it seems to be pretty much centred. Does this seem normal, any thoughts? See photos.

[Conserve]

Without your VIN number it is difficult to see what RealOEM is showing for your car and options available. I say that Because like my car you have 2 options for each components.
(see picture 1).
Other possibility if Mechanical belt tensioner is not seated properly (see pic 2 with the notch circled).

[Breach]

Thanks, in my case there is only one option for a tensioner, and that's identical to what was in the car prior.

I really don't see how it could be installed improperly as there is just a whole in the crankcase and two bolts to tighten but I'll check again.

[Conserve]

Okay. Measure height/ thickness of the new pulley vs. the old one with a ruler or caliper tool to see if the new one is taller.

[eislamoglu]

I have F11-520d (2014) with N47D engine at 190.000km. Do you have any experience regarding the lifetime of the v-belt. When should it be changed and what other parts must be changed while changing related to the v-belt. I guess mine hasn't been changed up to now!

[Breach]

Originally Posted by eislamoglu

I have F11-520d (2014) with N47D engine at 190.000km. Do you have any experience regarding the lifetime of the v-belt. When should it be changed and what other parts must be changed while changing related to the v-belt. I guess mine hasn't been changed up to now!

If original at 190k km - you're really lucky. Change both belt and tensioner, also check vibration dampener for cracking.

If you don't want to pay for OEM - tensioner is INA, Belt is Continental.

[BashShah]

opps, wrong message

[eislamoglu]

Originally Posted by Breach

If original at 190k km - you're really lucky. Change both belt and tensioner, also check vibration dampener for cracking.

If you don't want to pay for OEM - tensioner is INA, Belt is Continental.

Thank you for your suggestion.

[BashShah]

OK, I wrote opps wrong message before, and I erased it, and I am sorry if this is bad advise in advance..... cause I am not 100% sure myself. BUT I have compared your Drive belt route to other N55 Engines and it just looks wrongly routed.
16:49 minutes at this video:


https://quickenginesolution.co.uk/bl...e-reliability/
and

and

https://www.tiktok.com/@vroomtuber/v...70334628384046