I've got a squealer! Anyone, heard this noise before?

[cmc140]

Was wondering if anyone could guide me in the right direction on this noise.
It only seems to do it at idle, and when fully up to temperature.





Thanks in advance,
Chris

[dap930]

Possibly the fan is touching the fan housing? Or alternator bearings saying bye bye?

[cmc140]

Originally Posted by dap930

Possibly the fan is touching the fan housing? Or alternator bearings saying bye bye?

I didn't notice any spots where the fan has touched the housing. I guess I'll start by removing the belt and see if the problem is more evident without tension. Thanks for the reply I wasn't really sure where to start investigating.

[speednme1]

Fan belt to tight. Make sure you have the proper shims. I had the same issue a few years ago. I purchased new shims from Pelican and installed them in their correct positions. Noise went away. This may help.
Porsche 911 Fan Belt and Pulley Replacement | 911 (1965-89) - 930 Turbo (1975-89) | Pelican Parts DIY Maintenance Article

[quattrorunner]

vaccum leak

[T77911S]

remove the fan belt and start it to eliminate that.

[JFairman]

Sounds kinda like the AC belt is wadded up under the crank pulley and complaining.
Under the alternator nut and curved washer there may be extra shims. Move one of them to in between the pulley halves. That will move them apart a little and loosen the belt. Might make the noise go away and help the alternator bearings last longer.

[cmc140]

Thanks fellas I appreciate the guidance. The fan belt is pretty tight so I'll start there.
Will report back with my findings.

Thanks again,
Chris

[kevin930t]

Originally Posted by dap930

Possibly the fan is touching the fan housing? Or alternator bearings saying bye bye?

Sounds like a bad bearing to me

Sent from my SM-N910T using Tapatalk

[Rawknees'Turbo]

I was wondering if Kevin, Brandon and Deez were in the engine bay at the time (think Deliverance)!

[Tyfaim]

Hi Kevin

your PM box is full

This a busy time for you, hopefully you see this.

I want to send you a message my friend.

Rod

[Pat RUFBTR]

For me it is a noise of rotation or belt, to see both conjugated, a flight(leak) of space would make a constant noise.

[T77911S]

alt bearing

[cmc140]

Pulled the fan belt and there is some shaft play. So, I ordered a new alternator.

Appreciate the help,
Chris

[Pat RUFBTR]

Why to change the alternator while it is just enough to replace ball bearings?

[cmc140]

I don't really have the time or desire to mess around doing the bearings right now. The autozone alternator was cheap, plus 20% off, plus 3% ebates discount, lifetime warranty, and most importantly shipped to my doorstep.

[Pat RUFBTR]

Originally Posted by cmc140

I don't really have the time or desire to mess around doing the bearings right now. The autozone alternator was cheap, plus 20% off, plus 3% ebates discount, lifetime warranty, and most importantly shipped to my doorstep.

In this case I can understand him(it)!

[T77911S]

if you had to send yours back as a core you came out on the short end of the deal.

you could have just had yours rebuilt.

[JFairman]

This 160 Amp alternator is by far the best alternator you can get for a 911. Nothing else even comes close.
No core charge, no shipping your used up one to them or any of that. Just a killer alternator at a good price that shows 13.5 volts charging at idle speed with the headlights and AC on.

https://www.ebay.com/itm/Porsche-911-Alternator-1984-1989-High-Amp-160-Amp-High-Output-Generator-HD-/253268943027?_trksid=p2385738.m4383.l4275.c10

It only puts out the 160 amps if the electrical system has a use or need for it.

xbmwguy Frank gets credit for finding these on ebay.

[gsxrken]

Originally Posted by Pat RUFBTR

Why to change the alternator while it is just enough to replace ball bearings?

I couldn't source quality rebuild parts for my original one. I even tried my local starter/alternator rebuilders and they said the same thing... they wouldn't redo it with chinese parts and have a warranty issue weeks later. Ended up with the old one in my spare parts pile and a new one on my car.