Grinding noise just off idle (video inside)

[cobra]

Following up in case anyone else has this issue.

I compared another E46 M3 to mine and it also makes this noise. Slightly less noticeable, but definitely there and can be both heard and felt.

I can only assume this is some internal noises caused by the radial piston pump or vanos drive hub. It is kind of annoying now that I can hear it, but I am guessing it was there for the past 50,000 miles and I just never noticed it.

[cobra]

I listen to the video again. Can you keep that grinding nose continuously by holding the rpm at certain value? In the video then rpm continued going up then down, and repeated and I think maybe you could keep the noise there by holding the rpm at that point. Or increase the rpm slowly to see if the noise behaves differently.

The rough noise sounds almost like the chain rubbing again the valve cover or something like that. It is not like hub driving tabs hitting pump disk hoses, nor vanos rattling (bad roller bearing). I think it is related to the chain moving and rubbing something the wrong way.

I can only make it do the noise as I transition from idle to just-off-idle. If I rev to 1200 and hold it - no noise. At idle - no noise. Any other RPM - no noise. Because of that it's noticeable when starting from a stop and gentle raising the throttle like in city traffic. While driving there is no noise (other than the normal clackety S54).

It's a tricky one for sure! I am also thinking chain related.

[sapote]

I listen to the video again. Can you keep that grinding nose continuously by holding the rpm at certain value? In the video then rpm continued going up then down, and repeated and I think maybe you could keep the noise there by holding the rpm at that point. Or increase the rpm slowly to see if the noise behaves differently.

The rough noise sounds almost like the chain rubbing again the valve cover or something like that. It is not like hub driving tabs hitting pump disk hoses, nor vanos rattling (bad roller bearing). I think it is related to the chain moving and rubbing something the wrong way.

[cobra]

Do you have the stock larger disk holes or the new mod smaller pump disk holes for the driving hub tabs?

I have the stock disc with drilled holes

[sapote]

Do you have the stock larger disk holes or the new mod smaller pump disk holes for the driving hub tabs?

[cobra]

Bump in case anyone else would like to chime in with other ideas.

I now have 2000 miles since making this thread and the noise is still there exactly the same. Nothing has blown up or changed. Irks me a bit but... I guess it's fine?

[sapote]

sapote like I said I am not sure if it made this noise before or not. I probably never paid attention.

I got it now. Normal engine should not have that weird noise.

[jet_dogg]

Exactly the same sound, you can hear it before and after on his car.

sapote like I said I am not sure if it made this noise before or not. I probably never paid attention.


Would anyone here with a 100k+ mile car mind taking a video like above and sharing it? Engine should be warmed up.

Everyone's engine will be in various states of condition and would render any video pointless unless the maintenance was performed exactly as yours.

[lastMleft]

Here is another video of a before and after Beisan overhaul:

My guess is it is the VANOS oil pump building pressure. When you spin the oil pump by hand during the rebuild, it makes a similar pumping sound.

Sound similar to me just a very little bit quieter after.

[cobra]

Here is another video of a before and after Beisan overhaul:

My guess is it is the VANOS oil pump building pressure. When you spin the oil pump by hand during the rebuild, it makes a similar pumping sound.

Exactly the same sound, you can hear it before and after on his car.

sapote like I said I am not sure if it made this noise before or not. I probably never paid attention.


Would anyone here with a 100k+ mile car mind taking a video like above and sharing it? Engine should be warmed up.

[Slideways]

It could be the noise of the disk larger holes vs no noise smaller holes.
What included in the overhaul? Anti rattle kit, new small holes pump disk? The pump itself (4 pistons on eccentric shaft) should cause no noise.

That is not my video, but it has the full Beisan kit. The VANOS oil pump does make a pumping noise when spun with no oil pressure.

[jet_dogg]

I love how vid says repair kits making it sound gradiose when its just orings and a disc.

You can just use oem but have to replace them occasionally due to oring type.

[sapote]

Here is another video of a before and after Beisan overhaul:

My guess is it is the VANOS oil pump building pressure. When you spin the oil pump by hand during the rebuild, it makes a similar pumping sound.

It could be the noise of the disk larger holes vs no noise smaller holes.
What included in the overhaul? Anti rattle kit, new small holes pump disk? The pump itself (4 pistons on eccentric shaft) should cause no noise.

[Slideways]

Here is another video of a before and after Beisan overhaul:

My guess is it is the VANOS oil pump building pressure. When you spin the oil pump by hand during the rebuild, it makes a similar pumping sound.

[sapote]

This just happened after the work done on last weekend?