Hi all,

I've been having an issue with a loud squealing/chirping noise coming from the bell housing.

Car is 2015 1.2 TSI 110 cjzd (belt driven) 107k miles

Symptoms:

It's never present when cold, only after driving for 10ish mins.

It appears to be coming from the bell housing.

Only present when idle or cruising at around 30mph. If I blip the throttle it will go away untill revs drop back down.

Pressing in clutch makes no difference.

When I turn the engine off you can hear a continuous squeal that's slows to nothing with the engine stopping.

I'm going to try get a video today.

Any suggestions?

I'm looking to book it in for a clutch change, it's still on the original one.

Appreciate it

Are you not sure that the continual squeal AFTER you have switched the engine off, is not the turbo actuator trying and failing to recalibrate itself?

36 minutes ago, rum4mo said:

Are you not sure that the continual squeal AFTER you have switched the engine off, is not the turbo actuator trying and failing to recalibrate itself?

Can't say with certainty, but it started the same time as the other squeal so assuming it's the same. Lasts for about a second, also coming from the bell housing area. Sounds louder under the engine rather than on top.

Also no lights on the dashboard if that helps.

Thanks

Ok so I've run the car from cold and just let it idle untill the noise appeared. At around 25mins it lightly appeared. Then 20mins after it was at full squeal.

The strange part? The clutch pedal is affecting it now?? When half pressed it changes the squeal slightly, then fully pressed it goes away? Tried a few times with same results.

So now I'm thinking input bearing?

https://youtube.com/shorts/BZBu2Krn44M?si=92dvbLsgEfHXVi4W

Edited 15 May15 May by Moztune

In the video I go from:

Clutch not pressed

Clutch half pressed

Clutch fully pressed

Repeat.

You can hear the noise changing at each stage.

May be a worn release bearing. When the clutch is pressed it will put pressure on bearing which may make sound disappear. Reckon clutch at 107k the bearing will have been well used and clutch fairly worn. As far as I know the only way to check is Gbox out. If your doing a new clutch replace slave cylinder at the same time.

Alasdair

4 hours ago, Alasdair1 said:

May be a worn release bearing. When the clutch is pressed it will put pressure on bearing which may make sound disappear. Reckon clutch at 107k the bearing will have been well used and clutch fairly worn. As far as I know the only way to check is Gbox out. If your doing a new clutch replace slave cylinder at the same time.

Alasdair

I'm hoping it's a release bearing as it's far easier to get to than the input shaft, which is a gubbins out jobby.

I'm going to get a clutch kit and have a look whilst the box is off. Do you know if these are DMF?

Cheers

Not entirely sure but think if its a manual petrol it has solid but if it has dsg Gbox or diesel then DMF. Someone on here will know for sure.

Alasdair

So clutch/pressure plate and release bearing changed and still making the noise...

However, the bloke at the garage noticed the noise stops when you take the oil cap off the engine! Looking into this further if you block the pcv pipe were it goes into the air filter box the noise gets louder so he's on to something here.

I switched the PCV valve with the one from the wife's 1.0 seat (advantages of having 2 vag cars) and no difference. The oil separator is only a few months old but I cheaped out and bought a pattern part. It's only a baffle maze with no diaphragm which I compared with the previous so I'm reluctant to think that's it. Will have to check the rest of the breathing system tomorrow.

Hoping it's not the RMS as the gearbox was just off..

Edited 22 May22 May by Moztune

May be the aftermarket oil seperator as it hasnt a diaphram it may be allowing engine to create to much vaccuum causing the squeal. Reckon your on the right track with PCV system.

Alasdair

5 hours ago, Alasdair1 said:

May be the aftermarket oil seperator as it hasnt a diaphram it may be allowing engine to create to much vaccuum causing the squeal. Reckon your on the right track with PCV system.

Alasdair

We're thinking along the same lines here.

I've examined the system as far as I can without removing major items. All pipes are clear and the NRV or check valves work as intended.

I'm going to order a genuine oil separator and inspect the rest of the system whilst I'm switching that over on my next weekend 04E103464AM I think is the one I need.

So I've changed out the oil separator with a genuine one and found the gasket was leaking, as evidenced by the oil leaking around it.

Comparing them again I can see the orifice for the genuine one is much smaller, so it's plausible this was causing an issue.

Test drive has resulted in no more squealing! However, I'm not convinced I've resolved the cause of the high vacuum, as the cap is still being held on tight, simply resolved the symptom.

Anyone know what vacuum I should be reading on this engine? I have a vacuum gauge I can hook up to check it.

5 days later and still no noise. Appears the gasket was the issue.

Anyone know what the vacuum should be?