[Conntron]

Originally Posted by Pladi

good stuff. its good when you find a shop that you can trust.

Has this noise ever been resolved or deamed an issue ?

[Conntron]

Anyone have updates on this noise at all ?

[Pray for Mojo]

I've always attributed this noise to the vacuum pump. I've replaced my tensioner, idler, and belt already it made no difference. It happens almost year round for me if the garage is cool or cold in the morning. I figure the engine is sealed tight and pressure inside changes as it cools from operating temperature to ambient.

[ferocity02]

The tapping/knocking sounds in the op video is completely normal, unfortunately. It's the valve train in the engine. Open the oil cap and you'll hear it loud and clear.

[Mr.Beam]

Originally Posted by Pladi

Man i can tell you with 100 % certainty that both noises you are hearing are normal And my car has those both. The second one that comes from the alternator always comes ON then OFF later i think its part of the alternator charging circuit. I did not hear any screeching sounds like how you described. The first sound is you vanos. If you open the oil fill cap it sounds so much worse. Apparently completely normal.. Even on new N55.. i dont hear anything that sounds like an issue.. only saw the vid to 1:03

This is true on my 07 N55 i just about went crazy and wound up taking the valve cover off, but I found that it's the lifters and once warmed up it operates normally.

[Conntron]

Updates anyone ?

[Conntron]

Ttt

[Falko123]

Well I didn't read all but I had a similar issue.
To diagnose I did cold start without the belt to verify no sound. I had no sound. But I could see the harmonic balancer not running straight.
Than I inspected every bearing for excessive play. Turned out my AC compressor bearing had play. Changed that and the harmonic balancer. Than put the belt back checked cold start.
No sounds anymore.
Put on new belt and tensioner for better sleep and that's good for about 50k km so far.

Hope that helps.

[Conntron]

Originally Posted by Falko123

Well I didn't read all but I had a similar issue.
To diagnose I did cold start without the belt to verify no sound. I had no sound. But I could see the harmonic balancer not running straight.
Than I inspected every bearing for excessive play. Turned out my AC compressor bearing had play. Changed that and the harmonic balancer. Than put the belt back checked cold start.
No sounds anymore.
Put on new belt and tensioner for better sleep and that's good for about 50k km so far.

Hope that helps.

Which sound are you referring too ? The metallic ticking sound ?

[Falko123]

There were several sounds. One was a metallic ticking which became a loud knocking sound like a spun rod bearing. This turned out to be the AC compressor. The other one was a tiny periodic belt sound. The belt was scraping on the side of the harmonic balancer.