Very Loud Rattle from Engine *With Video*

[TheGodfather]

There is a very loud rattle coming from my engine.

It exists while idleing and gets louder the higher the RPM's.

This began after a brake bed-in procedure ( 60-10 mph) stops.
While finishing the bed in procedure, at one point the car shut off and all indicators came on. I restarted the car and it was find for 10 minutes until I came to a light.

The noise can be significantly loud when the engine is revved.

There are no indicators on the dash, other than yellow oil light that comes on after a little while of driving.

Any ideas?

Video of rattle: http://www.youtube.com/watch?v=hLlKesS283g

[Hit Redline]

You check the oil level? I hope.

Is this your 4.8 or 3.0?

[sfcl]

Originally Posted by TheGodfather

There is a very loud rattle coming from my engine.

It exists while idleing and gets louder the higher the RPM's.

This began after a brake bed-in procedure ( 60-10 mph) stops.
While finishing the bed in procedure, at one point the car shut off and all indicators came on. I restarted the car and it was find for 10 minutes until I came to a light.

The noise can be significantly loud when the engine is revved.

There are no indicators on the dash, other than yellow oil light that comes on after a little while of driving.

Any ideas?

Did you check the oil level? By braking hard a lack of oil can occur if the level is too low, hence the noise if the hydraulic valve clearance tuning system misses oil to work properly.

[sfcl]

Sorry Hit Redline, I didn't see your post!

[TheGodfather]

This is for he 3.0. The dipstick showed very very low oil, I just added some more. After adding the oil, the sound was barely noticable upon start up and idle, the noise returned after a very short drive low rpm drive. I'm waiting for he oil to " set" before I check the level again.

[sfcl]

With a bit of luck, this is only the hydraulic valve tappets which are empty of oil, assuming that the lost of oil pressure (during the had braking) forced the oil in the top of the engine to drop down to the pan...

There is a procedure recommended by BMW as this is something which can occur on vehicles doing very frequent short rides, (start the engine and while keeping the transmission in neutral, accelerating the engine to 2500 to 3000 rpm during 3 minutes, then letting it idling again for 5 minutes. In some cases they recommend to do that several times with a maximum of 5.), however before doing that you have to check first where the noise is located exactly.

[TheGodfather]

I am not sure I have the courage to attempt the procedure you have outlined sfcl.

I am afraid that starting the engine at all maybe causing further damage etc.

[sfcl]

Originally Posted by TheGodfather

I am not sure I have the courage to attempt the procedure you have outlined sfcl.

I am afraid that starting the engine at all maybe causing further damage etc.

You right, this is precisely why you need tolocate the noise first. On the other hand, I'd be surprised if you got heavy damages by only having a very short lack of oil pressure, unless you had extremely low oil. When an engine is restarted after an oil change and that the filter bowl is empty, it runs about 1 to 2 seconds without any oil pressure, oil light on, too. Crossed fingers for you.

[1stE53]

Originally Posted by sfcl

You right, this is precisely why you need tolocate the noise first. On the other hand, I'd be surprised if you got heavy damages by only having a very short lack of oil pressure, unless you had extremely low oil. When an engine is restarted after an oil change and that the filter bowl is empty, it runs about 1 to 2 seconds without any oil pressure, oil light on, too. Crossed fingers for you.

A little off topic: When changing my oil, I pour a quart of oil directly over the new filter before sealing it off. I believe this prevents the 'dry start'

[TheGodfather]

The sound seems to be coming from the left hand side if the engine, top side.
The x will be sitting about a week before anything is done.