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chriscoates81
Suzuka


Joined: 17 May 2013
Posts: 1112



PostPosted: Mon Apr 16, 2018 6:37 am    Post subject: Urgent help/advice needed Reply with quote

Hi guys, this morning i was moving the turbo around and a kind of whirring noise started happening. It was raining last night but this noise has been coming in and out for about a week (albeit not as loud). I had a listen outside the car and it doesnt seem any louder than normal, my first guess is a idler pulley, any other ideas? Ive put it as urgent as hopefully somebody is coming to buy the car on saturday (bloody typical) and i could do with some help and/or advice.

Cheers
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Leon1davies
Hockenheim


Joined: 04 Oct 2015
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Location: Bournemouth


PostPosted: Mon Apr 16, 2018 8:30 am    Post subject: Reply with quote

Does it sound like an electrical whirring or more mechanical?

Not got a turbo but on occasion I get a whirring which sounds more electrical on start up, lasts about 30 sec and then slowly disappears
 
  
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chriscoates81
Suzuka


Joined: 17 May 2013
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PostPosted: Mon Apr 16, 2018 8:51 am    Post subject: Reply with quote

TBH initially I thought it sounded quite electrical (think moon buggy kind of sound). Not 100% now tho. Would electrical mean alternator whine, I'm hopeful it's not serious.
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Martin996RSR
Spa-Francorchamps


Joined: 08 Dec 2016
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PostPosted: Mon Apr 16, 2018 9:39 am    Post subject: Reply with quote

There are lots of things it could be. Ideally you should get someone else to sit in it while you have a listen and get them to rev it to where the sound is the most prominent.

I have a very faint electrical noise that rises and falls with revs, and I'm sure it's electrical (RF) noise coming from the alternator being picked up and broadcast by the speakers.

If it's high pitched and coming from the rear of the engine then one of your pulley bearings could be dry.
 
  
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chriscoates81
Suzuka


Joined: 17 May 2013
Posts: 1112



PostPosted: Mon Apr 16, 2018 10:06 am    Post subject: Reply with quote

Unfortunately I've not got the car til Wednesday so I'll check it again then. I realised when I initially posted it could be lots of things based on my vague discription. I'm hoping the body shop guy might have a better idea as he has it for a few days.
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Marky911
Kyalami


Joined: 04 Jun 2009
Posts: 1785



PostPosted: Mon Apr 16, 2018 11:18 am    Post subject: Reply with quote

Typical eh Chris.

A quick check you can do to eliminate ancillaries is remove the auxiliary belt by using the tensioner, then start the car. The alternator, water pump, idler pulleys, etc won't be driven by the belt. If the noise is gone it's one of them. You can then spin them by hand with the engine off and see which one it is.

If noise doesn't go it's nothing driven by the belt.

DO NOT run engine for too long with belt off as you have no water pump for cooling.

PS Not sure how involved removing the belt is on a Turbo. On a Carrera it's simply a case of removing the airbox then using a spanner on the tensioner, and slipping the belt off. My GT3 was equally simple so as long as none of the extra Turbo gear is in the way, it should be easy.

A fellow turbo owner may have some other ideas. Good luck.
 
  
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chriscoates81
Suzuka


Joined: 17 May 2013
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PostPosted: Mon Apr 16, 2018 11:35 am    Post subject: Reply with quote

Cheers, I'm toying with booking off an afternoon to get it looked at. I'm going to ring body shop tonight and go from there.
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6543
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Mon Apr 16, 2018 12:37 pm    Post subject: Reply with quote

chriscoates81 wrote:
TBH initially I thought it sounded quite electrical (think moon buggy kind of sound). Not 100% now tho. Would electrical mean alternator whine, I'm hopeful it's not serious.


Does it carry on all the time, or more like a whine from something which cuts in and out every now and then (but always on when the car starts up from cold), up to the same speed each time?

Like this?
https://www.youtube.com/watch?v=ofZW5Kz7ems

If so I'd say its the SAI pump- can get noisy, and its an easy fix.
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chriscoates81
Suzuka


Joined: 17 May 2013
Posts: 1112



PostPosted: Mon Apr 16, 2018 1:14 pm    Post subject: Reply with quote

I'll check the video later but last week was as you describe, this morning the car can't of been driven mire than a mile to the body shop but it sounded louder today. Doesn't sound like that video in the cabin, however I didn't think the turbos had that part?
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chriscoates81
Suzuka


Joined: 17 May 2013
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PostPosted: Mon Apr 16, 2018 2:55 pm    Post subject: Reply with quote

It didn't sound quite so high pitched as that, more electric car kind of whirr/whine. Memory's a bit fickle though since this morning as I was in a bit of a rush. Hopefully I can investigate further tonight when I get in.
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MMT
Monza


Joined: 18 May 2011
Posts: 157



PostPosted: Mon Apr 16, 2018 3:13 pm    Post subject: Reply with quote

Just in case you’re not aware of this, if you do check the idler pulleys. If they spin freely and run on for a while that’s not good. A good one will stop after about one turn.
 
  
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Robertb
Long Beach


Joined: 01 Sep 2003
Posts: 6543
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Mon Apr 16, 2018 3:14 pm    Post subject: Reply with quote

The SAI always comes on at a constant speed when the car is started from cold, and go off after 20 or 30 secs. Then it comes on again from time to time, usually when you come to a halt after a drive.

Does the pitch rise and fall with the engine?
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chriscoates81
Suzuka


Joined: 17 May 2013
Posts: 1112



PostPosted: Mon Apr 16, 2018 3:22 pm    Post subject: Reply with quote

Robertb wrote:
The SAI always comes on at a constant speed when the car is started from cold, and go off after 20 or 30 secs. Then it comes on again from time to time, usually when you come to a halt after a drive.

Does the pitch rise and fall with the engine?


Hmm I thought it did but disappeared after 2000 revs or so. If it's knackered would it stay on longer?
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Robertb
Long Beach


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2002 Porsche 996 Carrera 4S

PostPosted: Mon Apr 16, 2018 3:32 pm    Post subject: Reply with quote

It stays on for a set period of time, regardless of engine revs, though you might not be able to hear it in the cabin at 2000rpm

Its not that the SAI gets knackered as such, but the bearings get grotty; remove it, disassemble some of it and spray light grease into the bearing. There is a great how-to which Alex Yates posted a while back, if it turns out to be the SAI.
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chriscoates81
Suzuka


Joined: 17 May 2013
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PostPosted: Mon Apr 16, 2018 5:23 pm    Post subject: Reply with quote

I visited body shop and he said he didn't hear anything unusual. My local garage suggested it could be a low power steering fluid level. Is it true the clutch and the power steering share the same fluid.
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cheshire911
Estoril


Joined: 10 Jun 2012
Posts: 3740



PostPosted: Mon Apr 16, 2018 6:48 pm    Post subject: Reply with quote

The hydraulic system is a closed system. If the level has fallen, you have a leak somewhere. Can you get it up on a ramp and check it out for leaks? Trying to diagnose without a lift and equipment can be challenging on these cars.

If it is the power steering low on fluid, don't drive it as you could damage the PS mechanism - and I suspect that will be expensive if it gets damaged.
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ragpicker
Estoril


Joined: 14 Apr 2013
Posts: 3631
Location: North East England


PostPosted: Mon Apr 16, 2018 6:57 pm    Post subject: Reply with quote

Marky911 wrote:

PS Not sure how involved removing the belt is on a Turbo. On a Carrera it's simply a case of removing the airbox then using a spanner on the tensioner, and slipping the belt off. My GT3 was equally simple so as long as none of the extra Turbo gear is in the way, it should be easy.

A fellow turbo owner may have some other ideas. Good luck.


Just the same as on yours Mark - 15mm spanner on the tensioner after youve removed the airbox.

There are literally loads of possibilities for whats causing a whirring noise dude, so I'm going to wait for a bit more info before having a guess. Good luck though Thumb
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deMort
Zolder


Joined: 21 Mar 2015
Posts: 5146
Location: Brighton


PostPosted: Mon Apr 16, 2018 7:46 pm    Post subject: Reply with quote

chriscoates81 wrote:
I visited body shop and he said he didn't hear anything unusual. My local garage suggested it could be a low power steering fluid level. Is it true the clutch and the power steering share the same fluid.


Yup .

If you want to remove the belt to check the idlers on a Turbo then remove the PAS pully .. it will make life a lot easier .. well .. as much as possible anyways .

water on a Turbo drive belt will cause noises , as will a weak tensioner .
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chriscoates81
Suzuka


Joined: 17 May 2013
Posts: 1112



PostPosted: Tue Apr 17, 2018 5:17 am    Post subject: Reply with quote

cheshire911 wrote:
The hydraulic system is a closed system. If the level has fallen, you have a leak somewhere. Can you get it up on a ramp and check it out for leaks? Trying to diagnose without a lift and equipment can be challenging on these cars.

If it is the power steering low on fluid, don't drive it as you could damage the PS mechanism - and I suspect that will be expensive if it gets damaged.


I know the clutch acclamator has a weep under the bonnet and that's why I wondered if it was that.
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cheshire911
Estoril


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PostPosted: Tue Apr 17, 2018 5:34 am    Post subject: Reply with quote

That leak needs to be sorted. Also check all the hydraulic pipework to clutch and steering rack. The steering rack has a common corrosion point on the pipework that can create leaks.

Timing is tight if a buyer is coming in days. But its best to have it seen and sorted before a buyer comes. Unless of course the buyer is Stevie Wonders twin with shared genes from the President of the Royal Society for the Deaf.
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