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DAVIDGT996
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Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Thu Sep 19, 2019 11:58 am    Post subject: Ticking noise to Rebuild time - worst 50 Miles ever. Reply with quote

Well my ticking noise that developed after doing an oil change was diagnosed as a big end bearing failure. Not sure if if the oil change bringing down some sludge and blocking the oil ways had anything to do with this but I only did about 50 miles after the oil change when I noticed the ticking noise on idling on my driveway.

Its rebuild time for me I'm afraid which was originally planned for 2 years time once I had finished paying University fees for my youngest.

The history on this car was a bit sketchy when I bought it so I knew a rebuild was on the cards at some stage with 100K on the clock. The service book said the IMS bearing had been changed at 80K so I was not to worried about that going pop on me.

The engine has been dropped and broken and it has come to light at some stage the engine has been broken before as it has closed deck liners installed. I have also been told that I have bore score on 4 & 5. Photos have been supplied etc.

There is no play in the IMS bearing which is the standard OEM bearing fitted by Porsche Sussex, however, as part of the rebuild I am advised to have this replaced. I have been given various options here with one of the options being replaced FOC with another standard OEM bearing. What would you go for here and would the extra £500 ish for the EPS bearing really be worth the extra money?
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7306
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Sep 19, 2019 1:03 pm    Post subject: Reply with quote

That is seriously bad luck. Sorry. How do the other bearings look? I'd go with a standard IMSB minus seals. What is your thinkung WRT the bore scoring? I don't see how an oil change could affect it.

MC
 
  
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DAVIDGT996
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Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Thu Sep 19, 2019 1:14 pm    Post subject: Bearings Reply with quote

the other bearings looked OK - they will all be replaced but having to go with a secondhand crank as cant be reground within tolerances.

3-6 will be lined - doesn't make sense just to do 4 & 5.
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MisterCorn
Dijon


Joined: 08 Jan 2011
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Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Sep 19, 2019 1:26 pm    Post subject: Reply with quote

Have you sourced a secondhand crank? Is it a 3.4 or a 3.6? Both are like hen's teeth though due to not being regrindable. I keep an eye on the usual sales places and have bought one of each in the last 3 or so years for a sensible price.

MC
 
  
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DAVIDGT996
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Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Thu Sep 19, 2019 1:30 pm    Post subject: s/h crank- 3.4 Reply with quote

yes my man has sourced one - he's into racing on the Porsche Motorsport circuit and found one at one of his specialist contacts.
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Hertsdriver
Nürburgring


Joined: 12 Nov 2018
Posts: 469
Location: Hertfordshire/London

2004 Porsche 997 Carrera 2

PostPosted: Thu Sep 19, 2019 1:53 pm    Post subject: Reply with quote

Closed deck rebuild? Any idea who did the work?
 
  
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DAVIDGT996
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Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Thu Sep 19, 2019 2:09 pm    Post subject: Reply with quote

yes - a well known engine rebuilder which I am not going to mention on here at the moment until I found out more.
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C4Silver
Spa-Francorchamps


Joined: 14 Aug 2019
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PostPosted: Thu Sep 19, 2019 2:14 pm    Post subject: Reply with quote

Can we guess ?? Draw straws ??
 
  
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DAVIDGT996
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Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Thu Sep 19, 2019 2:17 pm    Post subject: Reply with quote

not sure if they were done previously on 1-3 and left 3-6 alone? I will find out more and report back.
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Last edited by DAVIDGT996 on Thu Sep 19, 2019 2:21 pm; edited 1 time in total
 
  
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7306
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Sep 19, 2019 2:21 pm    Post subject: Reply with quote

I think it is largely irrelevant who did the previous work, unless it is thought that the failure was caused by some debris they left in. I'd be interested to see photos of the bearings though. We know that they wear and around 100k can be rebuild territory depending on usage patterns.

MC
 
  
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DAVIDGT996
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PostPosted: Thu Sep 19, 2019 2:27 pm    Post subject: Bearings Reply with quote

failed bearing
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MisterCorn
Dijon


Joined: 08 Jan 2011
Posts: 7306
Location: Nottingham, England

2004 Porsche 996 Turbo

PostPosted: Thu Sep 19, 2019 2:32 pm    Post subject: Reply with quote

It is the others I was more interested in to see how close they were. Are there date codes on the shells to see if they have been changed previously?

MC
 
  
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DAVIDGT996
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Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Thu Sep 19, 2019 3:34 pm    Post subject: Reply with quote

DAVIDGT996 wrote:
not sure if they were done previously on 1-3 and left 3-6 alone? I will find out more and report back.
all 6 were done previously.

Before anyone jumps to conclusions they are not the Aluminum Nikosil liners used by a well know engine re-builders prominent on here. I have spoken to them and shown them the photos.
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Last edited by DAVIDGT996 on Thu Sep 19, 2019 4:19 pm; edited 1 time in total
 
  
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GMG
Nürburgring


Joined: 07 Jan 2018
Posts: 460
Location: Devon


PostPosted: Thu Sep 19, 2019 4:19 pm    Post subject: Reply with quote

...I had Westwood steel liners installed when my engine was rebuilt as hairline cracks were discovered when the block was tested...a very well established (100yrs) engineering company fitted them...all good with me...
 
  
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DAVIDGT996
Trainee


Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Thu Sep 19, 2019 4:34 pm    Post subject: Reply with quote

GMG wrote:
...I had Westwood steel liners installed when my engine was rebuilt as hairline cracks were discovered when the block was tested...a very well established (100yrs) engineering company fitted them...all good with me...
Westwood was mentioned for replacement liners but he is recommending liners made from an engineering firm that makes them for classic F1 cars & Ferraris.
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infrasilver
Fast & Furious
Fast & Furious


Joined: 04 Oct 2010
Posts: 8493
Location: East Midlands

2001 Porsche 996 Targa

PostPosted: Fri Sep 20, 2019 2:06 am    Post subject: Reply with quote

As for the IMS bearing, go for the original again with seals removed, I've done this whenever I've had the engine apart. Or have the block machined to accept the later, larger bearing.
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Marky911
Magny-Cours


Joined: 04 Jun 2009
Posts: 2657



PostPosted: Fri Sep 20, 2019 4:48 am    Post subject: Reply with quote

Nightmare.

Bad luck especially since the engine has already been rebuilt once.

Your guy is probably talking about liners by Capricorn then?
 
  
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DAVIDGT996
Trainee


Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Fri Sep 20, 2019 7:20 am    Post subject: Reply with quote

MisterCorn wrote:
I think it is largely irrelevant who did the previous work, unless it is thought that the failure was caused by some debris they left in. I'd be interested to see photos of the bearings though. We know that they wear and around 100k can be rebuild territory depending on usage patterns.

MC
I was interested to find out which make/version of liners had failed so the same ones didn't go back in. On further research there is now some confusion on whether it was strengthening work on the bores. Not quite sure what strengthen work means in relation too closed deck design?. Anybody care to enlighten me.
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Marky911
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PostPosted: Fri Sep 20, 2019 7:42 am    Post subject: Reply with quote

Probably support rings. If the bores were still within tolerance for roundness then support rings around the top of the bores would have been an option. They aim to stop ovality at a later date.
Not as thorough a solution as re-sleeving. Cheaper though.
 
  
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DAVIDGT996
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Joined: 24 Feb 2019
Posts: 76
Location: Colchester


PostPosted: Fri Sep 20, 2019 7:50 am    Post subject: Reply with quote

thanks- that makes sense as there is slightly different metal colouring at the top of bores 4&5.
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Last edited by DAVIDGT996 on Fri Sep 20, 2019 9:47 am; edited 1 time in total
 
  
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