TB Forensics/Failure Analysis
01-25-2013, 04:06 PM
#16
Nordschleife Master
New belt is only about $35, just slap one on. 
Things that stand out to me on this belt.
1) More than a foot of scrapped teeth on both sides of the big scrape.
2) Crank gear the only thing I can imagine still spinning and grinding off the big scrape.
3) What broke the belt, assuming it broke after the teeth scrape?
3a) belt stretched enough to wrap on the crank and boom, breaks belt.
Things that stand out to me on this belt.
1) More than a foot of scrapped teeth on both sides of the big scrape.
2) Crank gear the only thing I can imagine still spinning and grinding off the big scrape.
3) What broke the belt, assuming it broke after the teeth scrape?
3a) belt stretched enough to wrap on the crank and boom, breaks belt.
01-25-2013, 10:19 PM
#17
Burning Brakes
01-26-2013, 08:22 AM
#20
Rennlist Member
Tom servo broke the belt.
01-26-2013, 09:40 AM
#22
Not the sharpest tool in the shed
Rennlist Member
Rennlist Member
Original belt
Cam lock of some sort (multiple reasons: lack of oil, sucked valve, etc.)
Poor regular maintenance
danglerb, you forgot the "3000" Loved that show. Have the full dvd set.
Cam lock of some sort (multiple reasons: lack of oil, sucked valve, etc.)
Poor regular maintenance
danglerb, you forgot the "3000" Loved that show. Have the full dvd set.
01-26-2013, 02:15 PM
#25
Instructor
Join Date: Nov 2009
Location: Petaluma, CA
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Perhaps the belt was too tight due to the tensioner not working properly and then some time later the water pump seized allowing the belt to slip shearing the teeth off. The belt does look awfully old and tired. Is that the original belt?
Last edited by springman; 01-26-2013 at 02:15 PM. Reason: http://forums.rennlist.com/rennforums/editpost.php?do=editpost&p=10174331
01-26-2013, 08:45 PM
#27
Archive Gatekeeper
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Thread Starter
Sorry guys, just finished the Saturday chauffeuring gig.
Just to complete the scenario, 95 Automatic, no clutching or declutching involved. Belt didn't break, Greg cut it to remove it.
Waterpump ok, cams not seized, spiders not broken.
I'm not sure why the 'every third missing tooth' pattern is there on the other parts of the belt. Didn't see the cam gear wear, as the engine's already apart.
Original 18 year old belt. One day the car wouldn't start. Owner kept hitting the key, until it wouldn't turn over anymore. Perhaps he shoulda stopped a bit sooner:
Just to complete the scenario, 95 Automatic, no clutching or declutching involved. Belt didn't break, Greg cut it to remove it.
Waterpump ok, cams not seized, spiders not broken.
I'm not sure why the 'every third missing tooth' pattern is there on the other parts of the belt. Didn't see the cam gear wear, as the engine's already apart.
Original 18 year old belt. One day the car wouldn't start. Owner kept hitting the key, until it wouldn't turn over anymore. Perhaps he shoulda stopped a bit sooner:
01-26-2013, 09:26 PM
#30
Archive Gatekeeper
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Thread Starter
Immediate cause of death: Circulatory failure.
Underlying cause of death: Beltosclerosis.
Underlying cause of death: Beltosclerosis.