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cvega
Spa-Francorchamps


Joined: 25 Feb 2013
Posts: 297
Location: Cambridge


PostPosted: Sat Jan 04, 2020 9:28 pm    Post subject: Noisy differential / gearbox Reply with quote

Today during my healthcheck at centre gravity, when doing some routine bearing checks Chris discovered a noise when free spinning the rear wheel by hand. Not grinding or laboured kind, but more like a gear ticking. Just another item to add to a long list.. what could it be?

That obviously made me think - time for a LSD Very Happy

Who's the go to guy to fix / rebuild transmission / diff and/or add LSD?
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2003 996 C2 (Ohlins R&T suspension, Toyosport/Spyder exhaust)
 
  
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TurboRob
Silverstone


Joined: 18 Feb 2019
Posts: 120



PostPosted: Sat Jan 04, 2020 10:05 pm    Post subject: Reply with quote

Wheel bearing?
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cvega
Spa-Francorchamps


Joined: 25 Feb 2013
Posts: 297
Location: Cambridge


PostPosted: Sat Jan 04, 2020 10:14 pm    Post subject: Reply with quote

I'd expect it to be a grinding noise, rather than ticking..
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2003 996 C2 (Ohlins R&T suspension, Toyosport/Spyder exhaust)
 
  
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DarthFaker
Trainee


Joined: 13 Jun 2019
Posts: 57



PostPosted: Sun Jan 05, 2020 1:41 pm    Post subject: Reply with quote

In my experience wheel bearings make all sorts of weird and wonderful noises, whopping, ticking, grinding, Frank Sinatra crooning..

Dont discount it being the bearing.
 
  
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cheshire911
Estoril


Joined: 10 Jun 2012
Posts: 3862



PostPosted: Sun Jan 05, 2020 2:57 pm    Post subject: Re: Noisy differential / gearbox Reply with quote

cvega wrote:
Today during my healthcheck at centre gravity, when doing some routine bearing checks Chris discovered a noise when free spinning the rear wheel by hand. Not grinding or laboured kind, but more like a gear ticking. Just another item to add to a long list.. what could it be?

That obviously made me think - time for a LSD Very Happy

Who's the go to guy to fix / rebuild transmission / diff and/or add LSD?


The answer to your last question is Mike at Sports & Classic.
Does a lot of gearbox and transmission strip and rebuilds for all sorts of problems on these cars.
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996 2002 X50 Turbo Manual
"Once bitten; forever smitten"
 
  
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cvega
Spa-Francorchamps


Joined: 25 Feb 2013
Posts: 297
Location: Cambridge


PostPosted: Sun Jan 05, 2020 3:57 pm    Post subject: Reply with quote

Thanks, I'll give him a bell.

Perhaps it is the bearing, I guess without someone in the know listening to it I won't know. It sounds like gears grinding very softly against each other.
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7389
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Sun Jan 05, 2020 5:44 pm    Post subject: Reply with quote

If possible, I'd get the back end up in the air and use a plastic tube with one end stuck against my ear to try to hear where the source of the noise is.

MC
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17203
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Sun Jan 05, 2020 6:45 pm    Post subject: Reply with quote

Yeah as MC says. Could be a CV joint.
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