Power steering or AC noise? What is this noise

[AnotherM]

Ive been trying to figure out what this noise is for a couple weeks. Sometimes its there, some times it isnt. Louder when AC is on. Any ideas? Definitely coming from one of the accessories up front.

[M5Rick]

Can you post a vid with sound.

[AnotherM]

Updated with video

[AnotherM]

Updated with video

[M5Rick]

It's that sewing machine clicking sound that Manzera had,but his was far worse. He said it was a dct g/box mounting seal that needed replacing though he never came back to confirm.

[AnotherM]

Originally Posted by M5Rick

It's that sewing machine clicking sound that Manzera had,but his was far worse. He said it was a dct g/box mounting seal that needed replacing though he never came back to confirm.

Yeah it sounds like a type writer almost. Do you know if Manzera is still active?

[M5Rick]

Originally Posted by AnotherM

Yeah it sounds like a type writer almost. Do you know if Manzera is still active?

You'll have to look for it I'm afraid, it's roughly about 24 months back

[AnotherM]

Just an update if anyone else hears this same noise,

Dealership had the car for a couple weeks and eventually gave up. They basically narrowed the noise to bottom end and said i could pay to have the pans pulled to see if the rod bearings or wrist pins are the cause.

Took it to my local bmw independent shop and they came back after a few days of diagnostic time with same conclusion.

Sent oil out for analysis, left car sitting in the garage for over a month now. Came back with better than average wear readings for all metals.

I decided to have the shop go ahead and repla e rod bearings. Hopefully they dont find anything else and the bearings are replaceble. Will know more by Friday when its all done.

[M5_Raz]

Originally Posted by AnotherM

Just an update if anyone else hears this same noise,

Dealership had the car for a couple weeks and eventually gave up. They basically narrowed the noise to bottom end and said i could pay to have the pans pulled to see if the rod bearings or wrist pins are the cause.

Took it to my local bmw independent shop and they came back after a few days of diagnostic time with same conclusion.

Sent oil out for analysis, left car sitting in the garage for over a month now. Came back with better than average wear readings for all metals.

I decided to have the shop go ahead and repla e rod bearings. Hopefully they dont find anything else and the bearings are replaceble. Will know more by Friday when its all done.

Doesn't really sound like engine knock caused by bearings. Sounds to me like there's something loose, a belt or something small of the sort.

[AnotherM]

Originally Posted by M5_Raz

Doesn't really sound like engine knock caused by bearings. Sounds to me like there's something loose, a belt or something small of the sort.

I agree as did bmw and the shop techs. All said they thought it was too high pitch.

Unfortunately, at this point iwe are certain 100% the noise is someher on bank 2 in the bottom of the motor. They are going to pull the lower pan, look over the oil pump and than proceed up to changing the bearings. If we find nothing, we will replace the bearings as a preventative measure and put it back together. At that point we will be completely lost as to where the noise is coming from. Bmw said possible put a camera in the top to inspect at that point.

[lucid21]

Hmmmm....This sound seems a bit random to me. No clear cycle. How does the sound change with revs (if at all)?

[AnotherM]

It doesnt change with rpms whoxh is even more puzzling. It actually goes away at about 2k

Either way the bottom end has been taken apart at this point. New bearings are being installed this morning so we shall find out if that was the cause.

I went over and looked at the internals while it was on the lift yesterday and everything looked extremely clean. Wrist pins, cyclinder walls, oil pump, bottom of pistons, all looked and brand new.

[AnotherM]

Well its discouraging, picked up the car today and the noise is exactly the same. Good news is the bewrings showed plenty of wear and were definitely in need of replacement. But unfortunately, i still have no resolution as to the noise cause. Shop feels everything looked
rand new inside and moved smoothoy so they have no idea where to go at this point other than drive and get it to blow up for warranty to cover a replacement motor.

Lost at this point.

[Doctor_X]

It sounds like the known DCT seal issue and fw chatter to me.

[AnotherM]

Originally Posted by Doctor_X

It sounds like the known DCT seal issue and fw chatter to me.

I mentioned that to the shop and to BMW, but they both said they put stethoscopes on the transmission and didnt hear anything.

If that is the case, what is the solution?

[lucid21]

Originally Posted by AnotherM

It doesnt change with rpms whoxh is even more puzzling. It actually goes away at about 2k

Either way the bottom end has been taken apart at this point. New bearings are being installed this morning so we shall find out if that was the cause.

I went over and looked at the internals while it was on the lift yesterday and everything looked extremely clean. Wrist pins, cyclinder walls, oil pump, bottom of pistons, all looked and brand new.

If it doesn't correlate with rpms, I think the internals thesis was weak to begin with. Also, I don't know that your warranty would be covered if the engine blows up now that you had an independent shop replace the bearings (if I understood that correctly). If something happens to your engine, BMW will probably point at the bearing work as the culprit unless there is something obviously orthogonal.

[AnotherM]

Originally Posted by lucid21

If it doesn't correlate with rpms, I think the internals thesis was weak to begin with. Also, I don't know that your warranty would be covered if the engine blows up now that you had an independent shop replace the bearings (if I understood that correctly). If something happens to your engine, BMW will probably point at the bearing work as the culprit unless there is something obviously orthogonal.

I was in correct, it dies increase speed of the ticking with rpm.

My warranty is a third party warranty. Wont make any difference who changed to bearings. Its already documented by bmw that the bearings were possibly the cause.

[M5_Raz]

I was hoping for a different resolution for you. You need to find a different shop, I would've done that way before changing the bearings.

I went through 3 "performance" shops that mainly focused on BMWs before finding one that actually solved the problem I was having last year.

Don't give up!

[M5Rick]

If the rod bearings were worn then it's good that they were replaced, saving the engine. Inspecting the oil filter folds gives a precursor to r/b failure if there are metal filings or debris there.
As far as the sewing machine noise goes then it's continue with the search.

[lucid21]

Originally Posted by AnotherM

I was in correct, it dies increase speed of the ticking with rpm.

My warranty is a third party warranty. Wont make any difference who changed to bearings. Its already documented by bmw that the bearings were possibly the cause.

What I am saying is that if this was BMW warranty, BMW would not have accepted someone else's repair and would have claimed fault in that (doesn't matter that BMW documented bearings as potential cause). Given it is not, then you are at the mercy of the aftermarket warranty policy issuer if something really goes wrong. They can make a similar claim but a 3rd party would have to tip them off that the bearings were most likely recently replaced based on what their "expert" eyes see in a post-mortem (which is unlikely). So, you are probably good in that respect.

I do not trust aftermarket warranty to take care of any major issues in a performance car like this. Their fine print tends to have so many clauses that they always have a way out of not paying for a blown engine, so I have always skipped them. A bearing on a stock E92 M3 I bought new spun at 15k miles and it took BMW 3 freaking months to agree to replace it (with the scored crankshaft). The repair bill was ~$12k (don't ask me why; BMW covered it). So, if that is how BMW acts, I expect less from an aftermarket warranty issuer but again one may get lucky.

Anyway, I hope you get to the bottom of the issue. I am at a loss as to why nobody can localize it...

[PB-32]

Originally Posted by M5_Raz

I was hoping for a different resolution for you. You need to find a different shop, I would've done that way before changing the bearings.

I went through 3 "performance" shops that mainly focused on BMWs before finding one that actually solved the problem I was having last year.

Don't give up!

Which shop did you choose?

[M5_Raz]

Originally Posted by PB-32

Which shop did you choose?

Carbahn Autoworks over in south San Jose. Solved it in two days vs. weeks for others.