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GT4
Nordschleife
Nordschleife


Joined: 08 Nov 2008
Posts: 30194
Location: Hertfordshire and Hampshire


PostPosted: Tue Jan 31, 2017 2:14 pm    Post subject: Reply with quote

On the basis I would to prefer an old and presumably worn (possibly critically) IMSB to be replaced with a new IMSB, I would strip both seals prior to fitting (it makes no sense not to).

In terms of the space behind the IMSB, every extra bit of "headroom" would improve the prospects of genuine turbulent IMSB wash.

For general reference, here is photo of single-row ex seals:



And although my previous description may have sounded off the cuff, I do agree the mod is NOT for the DIYer to attempt (not least the cost of the proper tools required for insertion and correct refit outweigh the labour savings)

If time was of the essence, then yes, only pulling the outer seal is better than pulling no seals!
 
  
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2548


1999 Porsche 996 Carrera 2

PostPosted: Fri Jan 12, 2018 4:44 pm    Post subject: Reply with quote

If the non-specialist press can get it right, why can't the Porsche press get it right?

https://www.pistonheads.com/features/ph-buying-guides/porsche-boxster-986--ph-used-buying-guide/37360
 
  
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adeymars
Montreal


Joined: 20 Dec 2008
Posts: 500
Location: Yorkshire


PostPosted: Fri Feb 02, 2018 2:23 pm    Post subject: Reply with quote

What a thread!
I've been away from Porsche for a while but the car still waits patiently for use and attention. That time has now arrived. My IMS bearing was inspected when my clutch was done @ 15 - 20k miles ago (cars on 85k now) when the IMS cover was changed. The local and trusted Indie said it was fine. After reading this thread end to end - and I did, sort of puts things into perspective mostly the input from Baz.
My view is if it reaches 100K then anything after that is a bonus and a rebuild is due anyway due to natural wear and tear. No guesses for where I would have the unit rebuilt.
Baz's statement should go down in Porsche history.
It's been a few years since I drove the car, now where's the rear window washer switch?
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Paul911c4
Newbie


Joined: 08 Sep 2017
Posts: 24



PostPosted: Mon Sep 03, 2018 10:10 pm    Post subject: Reply with quote

So i got a 99 3.4 which will have double row its at 72000 miles ...
So its going to blow up or not ? How much to get a independent to pull off front dust cover ?
 
  
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13800
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Mon Sep 03, 2018 10:35 pm    Post subject: Reply with quote

If its a manual wait till you have a clutch change. Should only be an hour or so on top.
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7725
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Sep 04, 2018 12:19 am    Post subject: Reply with quote

While this thread has been resurrected I thought it a good place to mention something I saw over the weekend on the Porsche stand at the Festival of Porsche.

Among all the Drivers Selection clothing and usual tat, they had a short engine M96 on show, I was obviously curious as this is my kind of thing. When looking at the IMSB I noticed that this genuine supplied short block had some kind of uprated IMS.

The bearing post is the same thicker type as the Hartech one that is in mine and the nut, that was fairly basic before is now a lot larger and is a flange nut spreading over most of the bearing cover face. I wonder if this is the larger bearing too?


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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13800
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Sep 04, 2018 6:03 am    Post subject: Reply with quote

Did you not strip it down and have a look?
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Phil 997
Brands Hatch
Brands Hatch


Joined: 05 Dec 2015
Posts: 13989
Location: Bournemouth,Dorset

2009 Porsche 997 Carrera 4S

PostPosted: Tue Sep 04, 2018 8:03 am    Post subject: Reply with quote

Dam , Infra how do we find out , I now want to know if Porsche have fixed a problem they wouldnt admit they had and if the uprated part is available to buy seperatly Dont know and if so how does the price compare with the known aftermarket fixes Question
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coullstar
Suzuka


Joined: 15 Sep 2015
Posts: 1141
Location: Aberdeen/Torphins


PostPosted: Tue Sep 04, 2018 8:13 am    Post subject: Reply with quote

My car has a 2010 manufactured 3.4 engine, this has the non serviceable style last design IMS so they have incorporate changes into replacement engines.
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wasz
Magny-Cours


Joined: 28 Dec 2012
Posts: 2548


1999 Porsche 996 Carrera 2

PostPosted: Tue Sep 04, 2018 10:24 am    Post subject: Reply with quote

For a visual comparison to Infrasilver's post, here is my original MY99 3.4 IMS bearing cover:



The nut and centre is much larger. The case halves casting is different. But the hole the bearing fits in looks the same size.

Looks to me like they decided the centre pin is the thing that needed beefing up. A bearing with a larger centre with the same size outer means the balls are smaller.
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13800
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Sep 04, 2018 10:29 am    Post subject: Reply with quote

The bearing doesn't fit through the hole on the final design. Hence why the engine has to be split to fit one.
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alex yates
Brands Hatch
Brands Hatch


Joined: 06 Mar 2014
Posts: 13800
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Tue Sep 04, 2018 10:31 am    Post subject: Reply with quote

Think someone posted a while back that all 'new' 996 engines (including the short blocks) had the revised design in.
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 7725
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Tue Sep 04, 2018 10:47 am    Post subject: Reply with quote

wasz wrote:
Looks to me like they decided the centre pin is the thing that needed beefing up. A bearing with a larger centre with the same size outer means the balls are smaller.


The thicker centre pin is something I have had in mine for around 5 years, fitted by Hartech and the IMS cover hole is the same diameter for both but the thinner bearing post is only thinner where it has the waisted section for the O ring and the threads, this is also the weak point of the original design. The centre of the bearing stays the same diameter ie you can use both posts, thinner original and thicker upgrade with the original bearing. With the thicker post you don't have room for an O ring though.

If you hear what sounds like metal in a washing machine (think roulette wheel), the end of the post has snapped off with the nut, shut off immediately.
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