X5 diesel engine noise - With VID.

[ard]

Originally Posted by Proflyer

Sure hope you didn't pay for someone to put it back together broken! If he couldn't get the stud out, why didn't he stop and find someone who could?
.

Sounds like the shop tried to say 'stop', OP insisted 'just get it done' and the shop finally relented and said 'yeah, it should be OK'.

Bit of a cluster IMO. People complain about dealers throwing parts at the issue....

[Price]

Originally Posted by Dr. Anthony

...
TLDR: Replaced turbos, it wasn't the turbos.

A bit of a long shot, but defective vibration damper (=crankshaft pulley) can cause similar squeaking. To check its state, you have to use a flat screwdriver as visually you can't really spot it splitting until it falls apart completely.

[fsd350]

Originally Posted by Price

A bit of a long shot, but defective vibration damper (=crankshaft pulley) can cause similar squeaking. To check its state, you have to use a flat screwdriver as visually you can't really spot it splitting until it falls apart completely.

Yep, that is becoming more common with mileage or mods.

[Dr. Anthony]

Originally Posted by Price

A bit of a long shot, but defective vibration damper (=crankshaft pulley) can cause similar squeaking. To check its state, you have to use a flat screwdriver as visually you can't really spot it splitting until it falls apart completely.

I never knew that was an issue. I'll take a look and see next week.
Thanks for the info

[boredincl]

Originally Posted by boredincl

Whats the latest with your X?
I have the same issue/noise so I pulled the inlet air tubes on low pressure turbo (lower big turbo) and the high pressure Turbo (top turbo) to check for shaft play. lower turbo is fine, but the top turbo has play in the shaft which is causing the compressor wheel to rub under full boost. I am in the process of finding a replacement CHRA (center section of turbo) or a rebuilt turbo and have been told buy 2 rebuilders who spoke to Borg Warner that it is a dealer only item.
I am not convinced that that is the case as B/W is having them rebuilt so they must be available unless they are rebuilding it themselves.
Has anyone had luck finding a replacement unit other then through BMW? My turbo part number is 5439 971 0088 (BorgWarner KP39-1873ECD310.12ACCXX) BMW part #11657811405.

I took a video of the high pressure turbo for our viewing pleasure.
https://youtu.be/2oQgK-6g3O0

[Dr. Anthony]

Alright, so I thought I would give an update to my issue. Long story short, its not solved yet. But here's what we did do.


Did a smoke test. Everything was good, except... where the wastegate is on the lower turbo. That's where you can see some soot escaping.. So the wastegate bushings/seals are gone.. and Looks like i'll need to pull the turbo off to get it rebuilt or swapped out.

I feel a bit of play. if I hold it closed, the noise goes away. Obviously I don't want to do this long term. I just wanted to see if I could replicate the noise while holding pressure on the wastegate so it doesn't move. Noise could NOT be replicated.

I also scanned for codes with a different machine and was able to get a few more out of it. I'll update the 1st post to show these for others searching.

they are:


4BB3: Nox sensor before denox cat- plausibility nox
4b6a: Nox sensor before denox cat - Plausibility
46B4: NOX Sensor before denox cat plausability nox.
4C04 - I think this could be EGT temp is too high (non-plausible)
4D16 - SCR system, efficiency: Efficiency too low
46A4 - NOx sensor after DeNOx cat., plausibility NOx: NOx signal offset too high at trailing throttle

[bawareca]

I have discussed this matters with some friends in Europe and turbo problems on a BMW diesels are almost unheard of. Even after upping the stock power 60-70%. And if a turbo wheel rubs against the housing it will be gone in a short time.

[Price]

BTW, some soot on/around turbos is OK, I believe there's even an tech.article from BMW about it.

[Dr. Anthony]

I would say thats quite a bit of play. My stock ones had no where near that amount of play

[boredincl]

Ok, thx, I thought that might be the case, I'm surprised it's not making more noise then what it is. Looks like I'm going to have to bite the bullet and get it from BMW since I can't find a quality rebuilt one. Plus if I get it from BMW it has a 2 year warranty I believe?