Strange crankcase noise

[ar80]

Hi, I hear a hum from the crankcase. Noise is heard while the engine is cold. I was told it might be from a nozzle, but I'm not sure. I'm uploading a link from a video you're making, the sound is coming from the crankcase and it's like buzzing. Please help if anyone knows what it could be.

[alexvalcic]

A neighbor from Bulgaria. what I would recommend to you is: take off the PK belt and then start the car. if there is no noise, the problem is in the PK distribution, if it is still there, then you can suspect an oil pump.

[ar80]

Thanks, i will try

[white exec]

The buzzing noise is going at many times the rate of the engine revs.
Might be alternator, or its external cooling fan fouling on something.
Bits of twig/brushwood can sometimes end up in the engine compartment.

[mickthemaverick]

Two other 'outside the box' thoughts occurred to me, either the oil dipstick bent or in the wrong way round and vibrating against the crankcase or maybe the oil pickup somehow vibrating inside the sump.

[alexvalcic]

I realized that the noise disappears when the car heats up. means a foreign body in the alternator or part of the meter rod, waste as a cause.

[ar80]

Some time ago a piece of the measuring rod broke and remained in the crankcase, but so far I have not had any problems.