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Targa, Panamera Turbo
Join Date: Aug 2004
Location: Houston TX
Posts: 22,366
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Failed Diff, Hmmm...I think I know what happened...
Eaton tandem real axle-differential - front differential of the tandem set has failed after 78,000 miles. The pics are of the pinion gear and the ring gear. Both gears have suffered catastrophic failures. Reviewing the pictures shows that both gears appear to have suffered stress fractures leading to failure.
What do you guys think caused it?  
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Michael D. Holloway https://simple.m.wikipedia.org/wiki/Michael_D._Holloway https://5thorderindustry.com/ https://www.amazon.com/s?k=michael+d+holloway&crid=3AWD8RUVY3E2F&sprefix= michael+d+holloway%2Caps%2C136&ref=nb_sb_noss_1 |
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11-12-2010, 02:06 PM
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Targa, Panamera Turbo
Join Date: Aug 2004
Location: Houston TX
Posts: 22,366
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sorry for the lack of quality of the pics - customer sent them in. I was hoping for the actual parts. I hope to get them in over the next week or so.
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Michael D. Holloway https://simple.m.wikipedia.org/wiki/Michael_D._Holloway https://5thorderindustry.com/ https://www.amazon.com/s?k=michael+d+holloway&crid=3AWD8RUVY3E2F&sprefix= michael+d+holloway%2Caps%2C136&ref=nb_sb_noss_1 |
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11-12-2010, 02:09 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,760
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We went through a period where we had failures that look exactly like that in our 935 clone with a G50 box. We set the r&p according to Porsche procedure, and broke three sets in a row. Now those were very short track outings..
On the next build we said eff the Porsche set up, and got out the Prussian Blue, and set the r&p by eye, and have not looked back..not a failure in...going on five years.. Looks like a set up failure, was that box rebuilt recently? Or to much power beiing passed through the box... Dont' think its a failure due to lube.. Also doesn't look like heat was a factor.. no bluing etc..
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Don't feed the trolls. Don't quote the trolls  http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others Last edited by TimT; 11-12-2010 at 02:22 PM.. |
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11-12-2010, 02:20 PM
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Alii&Maui
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How much experience does the driver have?
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11-12-2010, 02:21 PM
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Registered
Join Date: Jul 2003
Location: Valencia Pa.
Posts: 8,841
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I would be wondering if some sort of shock load was applied to those gears, maybe driver starting out too hard, and lurching the truck, or maybe stuck and and trying to rock it out. Or set up with too much backlash.
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No left turn un stoned |
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11-12-2010, 02:27 PM
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Hard to tell from the pictures but i'll guess driver abuse.
40k lb or 44k lb rears? Either way it takes a lot of torque to twist the pinion teeth off. I think the damage to the ring gear is from the pinion coming apart.
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Pete 79 911SC RoW "Tornadoes come out of frikkin nowhere. One minute everything is all sunshine and puppies the next thing you know you've got flying cows".- Stomachmonkey |
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11-12-2010, 02:37 PM
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they used snow tires?
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11-12-2010, 02:40 PM
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Registered
Join Date: May 2008
Location: Harford Co, MD
Posts: 1,623
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Overloaded axle + shock.
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-Brad 2002 Carrera2 1986 944 Turbo |
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11-12-2010, 02:44 PM
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I'm guessing bad gear oil...
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Silver '88 RoW Carrera Grey '06 A4 Avant |
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11-12-2010, 02:50 PM
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AutoBahned
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looks like some fast food got caught in there and "broke the metal"
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11-12-2010, 03:09 PM
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abit off center
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What happens over time if you haul your car on a trailer and strap it down through the wheels instead of the body frame..
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______________________ Craig G2Performance Twinplug, head work, case savers, rockers arms, etc. |
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11-12-2010, 03:23 PM
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Registered
Join Date: Jan 2007
Posts: 11,758
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The only time I ever saw anything like that the preload on the pinion bearings had loosened way up, and there was a rodeo clown involved.
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11-12-2010, 03:27 PM
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Cars & Coffee Killer
Join Date: Sep 2004
Location: State of Failure
Posts: 32,246
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Too many bolt-on upgrades without any attention to the drive train?
Can you give us the make and model of vehicle? That would help understand if it was something like I mentioned above or an overloaded bread truck.
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Some Porsches long ago...then a wankle... 5 liters of VVT fury now -Chris "There is freedom in risk, just as there is oppression in security." |
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11-12-2010, 03:29 PM
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Navin Johnson
Join Date: Mar 2002
Location: Wantagh, NY
Posts: 8,760
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Quote:
That is if you strap your car down by the wheels, and leave the transmission in gear... I have heard about these failures, but have never seen one in person.. BTW I strap my car down by the wheels.. lets the suspension work..
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Don't feed the trolls. Don't quote the trolls http://www.southshoreperformanceny.com '69 911 GT-5 '75 914 GT-3 and others |
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11-12-2010, 03:30 PM
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Senior Advisor
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Someone (our driver) did something like this trying to drive with the parking brake set. Ripped the pinion right out of the diff. I thought the drive shaft would have failed first.
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08 Cayenne Turbo |
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11-12-2010, 03:30 PM
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I didn't know you were supposed to put the Cool Collar in there...
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11-12-2010, 03:52 PM
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Registered
Join Date: Apr 2005
Location: outta here
Posts: 52,946
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One too many burnouts....
JR |
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11-12-2010, 04:30 PM
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Back in the saddle again
Join Date: Oct 2001
Location: Central TX west of Houston
Posts: 55,747
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Quote:
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Steve '08 Boxster RS60 Spyder #0099/1960 - never named a car before, but this is Charlotte. '88 targa  SOLD 2004 - gone but not forgotten
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11-12-2010, 05:25 PM
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Registered
Join Date: Dec 2001
Location: Cambridge, MA
Posts: 44,207
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Tru6 Restoration & Design |
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11-12-2010, 06:03 PM
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Registered Abuser
Join Date: Jul 2007
Location: Southwest Montana
Posts: 2,738
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Gear oil with the new tungsten shot additive ?
Multiple red line clutch drops with no tires on? Do tell.
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MT 930 1987 930 - Gone but not forgotten A man with priorities so far out of whack doesn't deserve such a fine automobile. I would rather wake up in the middle of nowhere than in any city on earth - Steve McQueen американский |
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11-12-2010, 06:54 PM
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911SC
1979 Porsche 911SC
1979 Porsche 911SC 3.0
1988 Porsche Carrera 3.2
1969 and 1986 Porsche Targa and Coupe 1720cc and 3
