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      12-01-2013, 01:20 PM   #1
Elvace
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Fuel to the fire. Engine knocking

Hey guys,

So my fears and worries became a reality yesterday while I was driving on the highway. A car was driving slowly in front of me so I changed lanes to get around. I was in 3rd gear if I remember correctly and the tachometer was showing ~5k rpms when I heard loud knocking and grinding sounds. I immediately clutch in and coast to the shoulder of the highway. Its worth noting that my engine oil temp was reading about 95 Celsius. I am always sure to let my engine oil warm up before I do any spirited driving. Until then, I keep the rpms well under 3k

My car is an 08 with 105,000 kms on it. I have no warranty on the car. It is bone stock. I am the second owner. I purchased it with 65,000kms on the odometer. Since it has been in my possession, I've had regular oil changes at every 10,000km. I had the spark plugs changed at 95,000km and at about 102,000km I replaced the throttle actuator on bank 2 and had the transmission oil changed because shifting felt a little notchier than usual.

I had the car towed and now I am just waiting for the shop to open tomorrow to decide the fate of my car.

Here is a short video I took. I apologise for the bad quality as I took it with my phone. If you listen closely I think you can hear the knocking.



Also, along with the knocking, I noticed it is much more difficult to put the car into gear. 1st and 2nd were difficult and reverse was very difficult as well. I did not try the other gears.

12/3/2013 Update:
Stopped by Bimmersport after work today for an update.
They had the car up on the hoist and the oil pan was dropped.

I didn't have much time but I was able to take a few quick pictures with my phone. Once I get pictures of all the bearings, Ill update this post with them and their corresponding locations.

1/3/2014 Update:
My shop finished installing the WPC treated bearings today and started the car. They said they heard something coming from the transmission so I gave them the green light to investigate.

I took a short video of the transmission while it was on the floor. They were pretty concerned about the play in the input shaft(?). Is that amount of play normal?

Sorry about the language. Its been an emotional day

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Last edited by Elvace; 01-03-2014 at 06:23 PM.
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      12-01-2013, 02:49 PM   #2
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Grinding sound? There is some slight ticking or pinging in that video, but not a grinding noise.
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      12-01-2013, 07:38 PM   #3
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Quote:
Originally Posted by dparm View Post
Grinding sound? There is some slight ticking or pinging in that video, but not a grinding noise.
"I was in 3rd gear if I remember correctly and the tachometer was showing ~5k rpms when I heard loud knocking and grinding sounds. "

The grinding sound was heard when he was driving.
The video just shows the ticking sound when its idling I believe.

Goodluck :/
Let us know how you get on with ti.
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      12-01-2013, 08:06 PM   #4
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Let us know how it turns out
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      12-01-2013, 11:36 PM   #5
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Weird that your tranny is having issues.... I am hoping that it's a clutch/tranny issue and NOT an engine bearing issue.
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      12-02-2013, 03:21 AM   #6
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Did the noise go away when you put the clutch in?
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      12-02-2013, 07:42 AM   #7
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If I remember correctly, the sound was present when the clutch was out and in.
But I'll confirm later today after I see the guys at Bimmersport.
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      12-03-2013, 11:09 PM   #8
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Added some quick pics
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      12-03-2013, 11:21 PM   #9
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so what was the noise? those bearings wouldn't have made a loud noise unless you spun one and then I would expect much more carnage.

Is the shop tearing this down? or were those bearings the thought of the car stopping working
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      12-03-2013, 11:31 PM   #10
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Quote:
Originally Posted by rev9k View Post
so what was the noise? those bearings wouldn't have made a loud noise unless you spun one and then I would expect much more carnage.

Is the shop tearing this down? or were those bearings the thought of the car stopping working
They haven't confirmed what was making the noise. They only pulled 3 bearings while I was there. The condition of the other bearings is unknown so I'll have to wait until they finish inspecting the other ones.
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      12-03-2013, 11:44 PM   #11
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Please photograph all bearings. Then remove the old bearings from the caps, and photograph the upper and lower caps as well. I know it will be hard to get pics of the upper caps, but it will be important to know if detonation was occurring as well. So try to get the photos of all bearings, front and back, along with the bearing caps.
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      12-04-2013, 12:01 AM   #12
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problem is in your transmission, not your motor. wtf is that shop doing taking apart your motor.
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      12-04-2013, 12:04 AM   #13
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      12-04-2013, 12:30 AM   #14
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I hate hearing story's like this
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      12-04-2013, 02:54 PM   #15
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Any updates?
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      12-04-2013, 03:27 PM   #16
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The rest of the bearings look identical to the first three I've posted. I haven't had a chance to take proper photos yet.

Just ordered WPC treated bearings and rod bolts from Autotalent.
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      12-04-2013, 03:31 PM   #17
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I can't watch the video currently, however, I do have a question. If you are having trouble shifting into gear, wouldn't this suggest a transmission problem as well?
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      12-04-2013, 03:53 PM   #18
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I suspect you will find a broken clutch strap - This happened to my E90.



It makes a really awful noise because it's doing this:

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      12-04-2013, 04:03 PM   #19
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Quote:
Originally Posted by happos2 View Post
I can't watch the video currently, however, I do have a question. If you are having trouble shifting into gear, wouldn't this suggest a transmission problem as well?
For now we're just focusing on the rod bearings. That ticking sound in the video was present with the clutch in and out. Also, while the car was on the hoist, they said that they heard the sound mostly coming from the oil pan.
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      12-04-2013, 10:12 PM   #20
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That definitely sounds like the M3's with spun bearings that I've heard in the past. It starts out sounding like that, and then within a day it becomes louder and louder. I'm interested in seeing how the crankshaft looks.

Please keep us updated, I hope that it's something else. The strange thing is that you were having transmission issues which shouldn't have any correlation to failed bearings. Fingers crossed and thanks for sharing the pictures! Please keep updated with the progress, you're in good hands with John. I texted him about it when I saw this thread go up a couple days ago.
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      12-04-2013, 10:29 PM   #21
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It's just a flesh wound.
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      12-04-2013, 10:52 PM   #22
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Quote:
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That definitely sounds like the M3's with spun bearings that I've heard in the past. It starts out sounding like that, and then within a day it becomes louder and louder. I'm interested in seeing how the crankshaft looks.

Please keep us updated, I hope that it's something else. The strange thing is that you were having transmission issues which shouldn't have any correlation to failed bearings. Fingers crossed and thanks for sharing the pictures! Please keep updated with the progress, you're in good hands with John. I texted him about it when I saw this thread go up a couple days ago.
Welcome back Maestro
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