A bad harmonic balancer can cause a knocking noise. The harmonic balancer doesn't actually produce the noise, but it can cause the noise in the engine.
A bad harmonic balancer often produces a rattling or clunking noise, especially during engine idle or acceleration. You might also hear a rhythmic thumping sound as the engine runs, which can indicate that the balancer is failing to effectively dampen vibrations. Additionally, if the balancer is severely damaged, you may notice a scraping or grinding noise if the rubber isolator has deteriorated. These sounds can signal that the harmonic balancer needs to be inspected or replaced.
It shouldn't make noise. If it does, replace it!
Replace the Harmonic balancer
Hard to say. However, if the "rubber gasket" you're talking about is the center bushing on your harmonic balancer, that could throw your Harmonic balancer out of balance. This could easily make it shake to beat the band which in turn could be the knocking noise you're hearing. I suggest you get it looked at immediatly. If that is what happened, your engine won't survive long.
== == I do believe if you hear a knocking noise that your crank shaft could be failing. Which means you will need a new engine. Have it checked out. Replace the harmonic balancer they will make a bad knocking noise. When you start it and the oil light goes out and it knocks, this is what is wrong with it.
it'll sound like a hollow tapping sound while rotating.
Most likely the noise is made by the power supply or a failing hard drive.
The balancer is made of 2 pieces That have a rubber piece in the center of them that hold the balancer together. If the balancer comes apart YES it will knock / make noise and the engine would vibrate/shake. You would be able to move 1 piece of the balancer with your hand if that was the case. Check it.
Whining noise near belts had pulleys adjusted any idea what is causing this
The high-pitched whining noise in a 2009 Jetta can be attributed to several potential issues, such as a failing alternator, worn-out serpentine belt, or issues with the power steering pump. The alternator may produce a whining sound if its bearings are worn, while a loose or damaged serpentine belt can create a high-pitched noise when it slips. Additionally, if the power steering fluid is low or the pump is malfunctioning, it can also generate a whining sound. It’s advisable to have a mechanic inspect the vehicle to pinpoint and address the exact cause.
A whining noise in the transmission is usually an indication the transmission fluid is low. Check the transmission fluid and fill it to the recommended level.