Notices
928 Forum 1978-1995
Sponsored by:
Sponsored by: 928 Specialists

TB Forensics/Failure Analysis

Thread Tools
 
Search this Thread
 
Old 01-26-2013, 09:42 PM
  #31  
928 at last
Rennlist Member
 
928 at last's Avatar
 
Join Date: Jul 2008
Location: Aurora, Ontario, Canada
Posts: 2,200
Received 2 Likes on 2 Posts
Default

Originally Posted by Rob Edwards
Immediate cause of death: Circulatory failure.

Underlying cause of death: Beltosclerosis.
My port-mortem for the belt itself would likely read along the lines of age-induced Haser’s syndrome, resulting in the above terminal condition.

Last edited by 928 at last; 01-26-2013 at 09:43 PM. Reason: Typos as usual
Old 01-26-2013, 09:52 PM
  #32  
928 at last
Rennlist Member
 
928 at last's Avatar
 
Join Date: Jul 2008
Location: Aurora, Ontario, Canada
Posts: 2,200
Received 2 Likes on 2 Posts
Default And,

And when the owner gets the invoice, I'm predicting the following symtoms will present:

Intense pain (Localized in the wallet area);
Profuse sweating;
Difficulty in breathing;
Pronounced pallor;
Irregular heartbeat with increased heart rate;
Acute hypertension;
And...wait for it.....
**** leakage.
Old 01-26-2013, 10:09 PM
  #33  
Randy V
Addict
Lifetime Rennlist
Member
 
Randy V's Avatar
 
Join Date: Jun 2000
Location: Insane Diego, California
Posts: 40,449
Received 97 Likes on 65 Posts
Default

Originally Posted by Rob Edwards

Original 18 year old belt.
Stupid should hurt.
Old 01-26-2013, 10:27 PM
  #34  
Mike Simard
Three Wheelin'
 
Mike Simard's Avatar
 
Join Date: Aug 2006
Location: Atlanta
Posts: 1,765
Likes: 0
Received 1 Like on 1 Post
Default

Originally Posted by Rob Edwards
Original 18 year old belt. One day the car wouldn't start. Owner kept hitting the key, until it wouldn't turn over anymore.
This means the belt's good for 17 years, 364 days!
Old 01-26-2013, 10:55 PM
  #35  
Don Carter
Rennlist Member
 
Don Carter's Avatar
 
Join Date: May 2001
Location: Cypress (Houston), TX
Posts: 2,632
Received 113 Likes on 67 Posts
Default

How many miles on the car?

I helped change an original belt on a 91S4 a year or so ago. The car had 43k miles and the belt looked fine, but maybe looks can deceive on old timing belts. Could have turned out like this.
Old 01-27-2013, 01:11 AM
  #36  
Lizard928
Nordschleife Master
 
Lizard928's Avatar
 
Join Date: Apr 2003
Location: Abbotsford B.C.
Posts: 9,600
Received 34 Likes on 25 Posts
Default

My first guess was correct.

What do I win
Old 01-27-2013, 05:44 AM
  #37  
FredR
Rennlist Member
 
FredR's Avatar
 
Join Date: Jun 2005
Location: Oman
Posts: 9,830
Received 723 Likes on 579 Posts
Default

Hmm! Assuming 32 pieces of "Bent Silver", everything in the cam drive system up the shoot, wobbly valve guides, pistons OK[carbon dent only?]- any takers for the final bill here?

Start the bidding at $10k for the repair? Whatever it is going to hurt- how the $*&k does a 95 still have the original TB on? Criminal- 5 years hard labour appropriate here?
Old 01-27-2013, 07:00 AM
  #38  
Leon Speed
Addict
Lifetime Rennlist
Member
 
Leon Speed's Avatar
 
Join Date: Jul 2007
Location: Germany
Posts: 4,539
Likes: 0
Received 3 Likes on 3 Posts
Default

So much for looking through the belt cover holes to see if the belt is there.
Old 01-27-2013, 09:03 AM
  #39  
danglerb
Nordschleife Master
 
danglerb's Avatar
 
Join Date: Oct 2006
Location: Orange, Cal
Posts: 8,575
Received 3 Likes on 3 Posts
Default

I couldn't figure out what would have made it break, so not surprised to hear it was cut off.

Rob how about measuring or comparing it to a new belt?

I am thinking failure may have been stretch, followed by slipping on the crank. When the motor stops seems like the most likely time for a tooth skip as the motor may actually turn backwards a bit.

I've heard plenty worse about first time Porsche owners. People used to US cars that never needed oil added to them. Whatever this costs, when the owner is done they will have a dandy 95 GTS.
Old 01-27-2013, 09:54 AM
  #40  
voskian
Rennlist Member
 
voskian's Avatar
 
Join Date: Oct 2003
Location: Saco, Maine/ Scarborough, Maine
Posts: 1,979
Received 580 Likes on 215 Posts
Default

91GT I bought last August with 24K miles had all original TB, WP and tensioner. Replaced all parts, and they all looked new. Car had not been driven since 2000, but why take a chance..
Old 01-27-2013, 04:12 PM
  #41  
IcemanG17
Race Director
 
IcemanG17's Avatar
 
Join Date: Sep 2004
Location: Stockton, CA
Posts: 16,270
Received 75 Likes on 58 Posts
Default

this is a MINIMUM $10k repair......look at all those bent valves......piston hits too....I'm guessing those should be replaced...... It could EASILY be $20k plus if the owner decides to upgrade along the way....

sad.....
Old 01-27-2013, 11:12 PM
  #42  
Charley B
Rennlist Member
 
Charley B's Avatar
 
Join Date: Apr 2006
Location: Patterson, Ca
Posts: 4,373
Likes: 0
Received 2 Likes on 2 Posts
Default

So would this count as the first Timing Belt failure, due to the belt, that Greg has seen? He commented recently that he had never seen a failure in which the root cause was actually the belt.
Old 01-27-2013, 11:38 PM
  #43  
SeanR
Rennlist Member
 
SeanR's Avatar
 
Join Date: Apr 2006
Posts: 35,700
Received 500 Likes on 267 Posts
Default

Crap deal and one many a new owner has had to deal with.

Just pulled this off a 2nd owner, 62k mile car that has been in storage since 2002.



Car was pulled out of the storage unit last week.
Old 01-28-2013, 12:37 AM
  #44  
RKD in OKC
Rennlist Member
 
RKD in OKC's Avatar
 
Join Date: Oct 2004
Location: In a tizzy
Posts: 4,987
Likes: 0
Received 14 Likes on 11 Posts
Default

Ouch, seeing that makes my pocket book burn. Still too soon.
Old 01-28-2013, 12:38 AM
  #45  
danglerb
Nordschleife Master
 
danglerb's Avatar
 
Join Date: Oct 2006
Location: Orange, Cal
Posts: 8,575
Received 3 Likes on 3 Posts
Default

Sean, I don't have a clue what you are showing me. What am I supposed to notice?


Quick Reply: TB Forensics/Failure Analysis



All times are GMT -3. The time now is 03:50 PM.