[ChrizLoud]

Hello!

My 335D has a strange sound coming from the vacumpump area.
The sound is pretty high up in frequency and clear.

I was thinking of timing chain noise but it sounds so clear. Not like its hitting something.

Maybe it can be the chain tensioner that connects the two camshafts?

Sorry about the rust and corrosion in the engine bay.
New project car and everything will be sorted later.

[ChrizLoud]

I just realized that the sound is only present when the engine is fully warmed up.
Here is a video showing the same thing but with cold engine. Noise is not present?

[Pierre Louis]

Definitely sounds abnormal. Could be from anything in the front of the engine.

[ChrizLoud]

Thank you for your reply.

Can it be the vacum pump that makes the sound?

[Mik325tds]

Vacuum pump would be my first guess, too. Never heard it make such a sound and can't think of a reason why it should when it is warm only.
Do you have a stethoscope or long screwdriver? That might help you to locate the source of the sound better.

[Pierre Louis]

Originally Posted by ChrizLoud

Thank you for your reply.

Can it be the vacum pump that makes the sound?

I would be very careful and diagnose the problem as soon as you can before it gets worse or causes more damage.

PL

[Pierre Louis]

Here, the article implies that the valve train can be a likely candidate: http://www.popularmechanics.com/cars...gine-16705321/

Here, the solution was that there wasn't enough oil/the oil level sensor stopped working:

Not sure what a defective vacuum pump would sound like.

PL

[toy_soldier]

Try removing the drive belt and see if the noise goes away. Then you can rule out all the accessory pulley and crank pulley.

[Hoooper]

exactly the same tapping frequency that usually comes from the vacuum pump, but seems to be higher pitch.

[christophe32]

Hello, did you resolve your problem please ? I have the same problem.

Thanks