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rogelio_serrano
Newbie


Joined: 07 Nov 2019
Posts: 5



PostPosted: Thu Nov 07, 2019 10:56 am    Post subject: stock double row ims bearing specs Reply with quote

Hi guys!

I am about to collect a used 1999 996 cabriolet. I was wondering if somebody has the specs for the original double row bearing? id, od, length or part number? I'm not getting the IMS Retrofit on the market. I'm sourcing my own hybrid bearing with the same size as stock. the ones on the market are way overpriced in my opinion.

Last edited by rogelio_serrano on Thu Nov 07, 2019 11:01 am; edited 1 time in total
 
  
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7331
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Nov 07, 2019 11:00 am    Post subject: Reply with quote

Hi, welcome to the forum. Is there a problem with the bearing in the car you are picking up? Generally the dual row bearings are much better and less likely to give issues than the later ones.

MC
 
  
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rogelio_serrano
Newbie


Joined: 07 Nov 2019
Posts: 5



PostPosted: Thu Nov 07, 2019 11:11 am    Post subject: Reply with quote

hi

Thank you!

I have no idea what's on the car but it seems to have gone the whole 136k with the original bearing. The previous owner did not mention the ims bearing being upgraded. I am installing an oil condition monitor and I just want the bearing ready when it shows signs of impending failure. a hybrid bearing with same size as the all steel original is going to be more than 10 times stronger and requires much much less lubrication than the original. I think the original bearings does not have much margin in in terms of strength and loading.

I know a hybrid bearing for the wheel hubs goes at almost 200 gbp each. a smaller bearing would be cheaper than the 800 to 1000+ the current imsb upgrades on the market.
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 07, 2019 11:25 am    Post subject: Reply with quote

20 47 14. Stock bearing is not available anymore. You're better off just flipping the outer dust sheild and leaving be, unless you plan on stripping the engine. In that case fit a bigger bearing.

Messing with it in situ can do more harm than good.
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2000 Manual 996 C4 Arctic Silver Convertible


 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 07, 2019 11:26 am    Post subject: Reply with quote

The ims upgrades aren't 800 quid.......the labour is to fit them.
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rogelio_serrano
Newbie


Joined: 07 Nov 2019
Posts: 5



PostPosted: Thu Nov 07, 2019 11:49 am    Post subject: Reply with quote

I found it here:

http://burnerscars.blogspot.com/2016/08/sourcing-your-own-porsche-ims-bearing.html

Thank you for the replies

I have sent queries for hybrid bearings, high temp seals with metal cages.
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 07, 2019 11:53 am    Post subject: Reply with quote

Why do you want one with seals on it? Its in an oil environment.
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rogelio_serrano
Newbie


Joined: 07 Nov 2019
Posts: 5



PostPosted: Thu Nov 07, 2019 12:03 pm    Post subject: Reply with quote

Foreign object damage is more likely in an open bearing.

it can get over lubricated in an oil bath. hybrid bearings need a very specific type of lubrication and only very little of it. engine oil has a different lubricating characteristics, optimised for plain bearings.

The original sealed bearings had lower temperature ratings. high temps degraded the seals and allows the grease to be washed out.

hybrid ceramic bearings run at lower temps anyway. and there is enough heat sinking and oil splash for cooling.
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Thu Nov 07, 2019 12:12 pm    Post subject: Reply with quote

Foreign object damage will muller the engine before it gets in the bearing. Its not in an oil bath when the engines running and the oil vapour when it is is perfectly adequate for ball bearing lubrication.

Good luck with you mission thumbsup
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HSC911
Long Beach


Joined: 23 Jul 2014
Posts: 6755
Location: Bedford


PostPosted: Thu Nov 07, 2019 1:41 pm    Post subject: Reply with quote

Welcome
 
  
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fot0
Newbie


Joined: 03 Apr 2018
Posts: 35
Location: Thames Valley


PostPosted: Thu Nov 07, 2019 4:59 pm    Post subject: Reply with quote

At 130k on original bearing then leave it alone. You're better off changing oil, checking filter for debri or dropping sump. Purchase a magnetic sump plug, regular oil changes and check levels.
 
  
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rogelio_serrano
Newbie


Joined: 07 Nov 2019
Posts: 5



PostPosted: Thu Nov 07, 2019 6:40 pm    Post subject: Reply with quote

fot0 wrote:
At 130k on original bearing then leave it alone. You're better off changing oil, checking filter for debri or dropping sump. Purchase a magnetic sump plug, regular oil changes and check levels.

I am installing a full blown engine debris sensor. It detects ferrous and non ferrous particles In oil oil lubricity and water and coolant in oil in real-time.
 
  
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Griffter
Spa-Francorchamps


Joined: 22 May 2016
Posts: 368



PostPosted: Fri Nov 08, 2019 7:43 am    Post subject: Reply with quote

Do you know for sure it’s got a dual row bearing?
 
  
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Marky911
Magny-Cours


Joined: 04 Jun 2009
Posts: 2663



PostPosted: Fri Nov 08, 2019 8:28 am    Post subject: Reply with quote

rogelio_serrano wrote:

I am installing a full blown engine debris sensor. It detects ferrous and non ferrous particles In oil oil lubricity and water and coolant in oil in real-time.


Rogelio seen earlier -




Only joking Rogelio. Welcome to the forum. Thumb
 
  
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Alex
Le Mans
Le Mans


Joined: 06 Mar 2014
Posts: 17144
Location: The Ribble Valley, Lancashire

2000 Porsche 996 Carrera 4

PostPosted: Fri Nov 08, 2019 8:35 am    Post subject: Reply with quote

Good idea with the sensor but it only detects wear. Any failure of a part will only be detected after the damage is done.

Just a note on ceramic bearings - the ln ones have been known to explode.
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g911omr
Spa-Francorchamps


Joined: 29 Sep 2009
Posts: 307



PostPosted: Fri Nov 08, 2019 8:37 am    Post subject: Reply with quote

Marky911 wrote:
rogelio_serrano wrote:

I am installing a full blown engine debris sensor. It detects ferrous and non ferrous particles In oil oil lubricity and water and coolant in oil in real-time.


Rogelio seen earlier -




Only joking Rogelio. Welcome to the forum. Thumb



Laughing
 
  
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mattomg
Trainee


Joined: 10 Apr 2019
Posts: 51
Location: Portsouth


PostPosted: Fri Nov 08, 2019 4:08 pm    Post subject: Reply with quote

Marky911

Yep Very Happy
 
  
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wasz
Sepang


Joined: 28 Dec 2012
Posts: 2998


1999 Porsche 996 Carrera 2

PostPosted: Mon Nov 11, 2019 11:15 am    Post subject: Reply with quote

LOL @ newbie fear of IMS bearing collapse.

You bought the right car, an early 3.4 with dual row bearing and ferrous coated pistons is the toughest 911 fitted M96 engine (so long as you didn't buy a changeover car).

Biggest risk now at 136k is probably worn out main bearings.

Either a) Do nothing drive it and enjoy, many go to mega miles without a care.

or b) have Hartech fully rebuild it and stick a new bearing in for you with all their other modifications for you peace of mind.

There's not much point in doing anything else as its an old engine with a pile of miles and anything could go wrong at any time. Not much point trying to fix one failure mode when theres hundreds of others equally likely.

When you next change the clutch its considered best practice to inspect the bearing for play and flip the outer seal off so it does not retain old oil.
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