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Ericf
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Joined: 18 Jun 2018
Posts: 11



PostPosted: Fri Apr 26, 2019 11:22 pm    Post subject: C4 with IMS upgrade Reply with quote

With all the comments about IMS failure etc, how safe, relatively speaking, is a low mile C4 (44,000) which has recently had a new clutch and IMS bearing upgrade?

Cheers
 
  
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infrasilver
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Fast & Furious


Joined: 04 Oct 2010
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Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Fri Apr 26, 2019 11:53 pm    Post subject: Reply with quote

It depends to some extent to what IMSB it was changed for and what model of 996.

Any new bearing will add more life to an engine but its how long it will last that is the question? The original bearing may have been perfectly fine for more miles than the replacement.
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wasz
Sepang


Joined: 28 Dec 2012
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1999 Porsche 996 Carrera 2

PostPosted: Sat Apr 27, 2019 7:29 am    Post subject: Reply with quote

It also depends how it was replaced.

Did they tear down the engine and remove the IMS shaft to replace the bearing on a press as part of a rebuild?

Did they bosh it in in-situ with a hammer?

Or something in between?

Bearings are fairly easily damaged / not got in straight / damage caused to other components.

If considering a car with a new IMS bearing ask why it was replaced -was there play in it? Paranoia? and ask who did it and what procedure was followed.
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7154
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Sat Apr 27, 2019 7:31 am    Post subject: Reply with quote

I would want to know what is meant by an 'upgrade'. Some upgrades I would avoid.

MC
 
  
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Griffter
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Joined: 22 May 2016
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PostPosted: Sat Apr 27, 2019 8:12 am    Post subject: Re: C4 with IMS upgrade Reply with quote

Ericf wrote:
With all the comments about IMS failure etc, how safe, relatively speaking, is a low mile C4 (44,000) which has recently had a new clutch and IMS bearing upgrade?

Cheers


Relative to other models/mileages, or relative to how it was before?

Have a read of the sticky IMSB thread to follow lines of reasoning, but in summary, it seems likely that premature failure of the bearing is down to a dodgy batch of bearings, blocks or installation. The bearing is too tight in the block, and wears prematurely. Some fail early (before 40-60k), some never fail.

Depending on the age of your car it may or may not have the “dual row” bearing (used on earlier cars). Lots of people claim the dual row is the better bet, but there’s no way to tell what’s fitted without taking things apart. Of course there’s a counter theory that dual row are more prone to being over stressed if they’re not fitted square (because each row then takes a different load at different points instead of an even load all the way round) and the ball bearings and bearing surfaces are smaller.

When it comes to “upgrade”, what does that mean? Was a roller bearing fitted? Better in some applications but not necessarily this one; was an oil fed bearing fitted? Where does the oil feed come from and does that affect the oil feed to anything else?; Was a ceramic bearing fitted (eg LN) and is it lifed? Some of these have a stated service life of 4 years. Is that an upgrade?

As you can see, the only answer to your question is “it depends”!
The short answer is probably that if your original bearing was in need of replacement, then an “upgrade” is safer. There is a risk to doing it in situ (ie during a clutch change with the engine in the car) because unlike, say a wheel bearing, IMS bearings are not designed to be replaced without stripping the engine down. Despite this, techniques have been developed and people seem to get away with it.
On the other hand if your original bearing was ok, my view and many others is that it’s safer to leave well alone. If it ain’t broke...
 
  
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Ericf
Newbie


Joined: 18 Jun 2018
Posts: 11



PostPosted: Sat Apr 27, 2019 12:52 pm    Post subject: Reply with quote

Thanks for the responses. These are questions that I should ask. My query arose in respect of a car that I've seen advertised on autotrader at Northway Porsche.
 
  
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Ericf
Newbie


Joined: 18 Jun 2018
Posts: 11



PostPosted: Tue Apr 30, 2019 12:30 pm    Post subject: Reply with quote

This is the car in question.

https://www.northway.co.uk/used/porsche/996/carrera-4/reading/berkshire/18843844/

Anyone know it?
 
  
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Robertb
Dijon


Joined: 01 Sep 2003
Posts: 7120
Location: South Oxfordshire

2002 Porsche 996 Carrera 4S

PostPosted: Tue Apr 30, 2019 2:04 pm    Post subject: Reply with quote

Don't know the car, but I've dealt with Northways... a very knowledgable bunch.

They will tell you exactly what was used and how it was fitted.
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Ericf
Newbie


Joined: 18 Jun 2018
Posts: 11



PostPosted: Wed May 01, 2019 8:11 am    Post subject: Reply with quote

Car has now sold but i was informed that the IMSB was replaced with Northways own kit at the request of the owner. Cheers.
 
  
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