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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. Last edited by manbridge 74; 08-13-2019 at 06:16 PM.. |
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08-13-2019, 06:14 PM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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The failed sprockets were sent back to Sebro, and they were tested for harness. If they were counterfeit, they definitely would have mentioned it.
The sprocket in my pic is from Porsche. I doubt they were sold counterfeit sprockets either.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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08-14-2019, 10:57 AM
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(man/dude)
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Don't you hate it when you answer a question then it just leads to more questions??? Sorry to ask but there's a lot to know...... Has there been more than one actual failure? Was it an intermediate sprocket or cam sprocket, both, all four, or all 6? Is the date of manufacture of the failed parts known? Is the part # and revision of the part(s) known? Did the returned parts pass or fail Sebro's test? Can we see pics? I'm following the breadcrumbs here, trying to decide what to do with the short block in front of me. I have faith in my cam and idler sprockets, having tested them for hardness, but the intermediate shaft is sealed up in the case. To make it more interesting, the cam sprockets that I tested for hardness were revision 02 parts, yours look like 04 parts, and the ones buried in my motor are 04 parts as well.
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Heavy Metal! Part Deux - The Carbon Copy Project Heavy Metal https://tinyurl.com/57zwayzw (SOLD) 85 Coupe - The Rot Rod! AX beater Quality Carbon Fiber Parts for Classic 911s: instagram.com/jonny_rotten_911 Last edited by Jonny042; 08-14-2019 at 03:27 PM.. |
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08-14-2019, 03:23 PM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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It is a problem on all the sprockets. Cam, tensioner and intermediate shaft.
Parts affected started at 10/2017 Sebro passed the failed parts by their hardness test, and denied warranty. New parts tested higher on the Rockwell scale than the old parts, so that can't be the issue.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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08-16-2019, 11:08 AM
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Functionista
Join Date: Jul 2011
Location: CO
Posts: 7,717
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Quote:
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Jeff 74 911, #3 I do not disbelieve in anything. I start from the premise that everything is true until proved false. Everything is possible. |
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08-16-2019, 12:58 PM
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(man/dude)
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Are we talking about multiple instances or an isolated incident? If it's not the hardness, maybe it's something with the pitch, increasing the point load on individual chain rollers or something like that. Maybe even a problem with the chains "taking out" the sprockets?
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Heavy Metal! Part Deux - The Carbon Copy Project Heavy Metal https://tinyurl.com/57zwayzw (SOLD) 85 Coupe - The Rot Rod! AX beater Quality Carbon Fiber Parts for Classic 911s: instagram.com/jonny_rotten_911 |
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08-19-2019, 06:20 AM
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(man/dude)
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Still wondering, how many failures?
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Heavy Metal! Part Deux - The Carbon Copy Project Heavy Metal https://tinyurl.com/57zwayzw (SOLD) 85 Coupe - The Rot Rod! AX beater Quality Carbon Fiber Parts for Classic 911s: instagram.com/jonny_rotten_911 |
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08-28-2019, 04:20 PM
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Puny Bird
Join Date: Nov 2002
Location: Port Hope (near Toronto) On, Canada
Posts: 4,566
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I bought them around 2012-2013 hopefully they're OK?
From our host, they weren't sebro IIRC.
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'74 Porsche 914, 3.0/6 '72 Porsche 914, 1.7, wife's summer DD '67 Bug, 2600cc T4,'67 Bus, 2.0 T1 Not putting miles on your car is like not having sex with your girlfriend, so she'll be more desirable to her next boyfriend. |
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08-28-2019, 06:05 PM
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PRO Motorsports
Join Date: Nov 2001
Location: Burbank, CA
Posts: 4,580
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Not sure how many, but multiple failures across multiple shops.
Mark, you should be fine. Parts numbers traced to late 2017 batch.
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'69 911E coupe' RSR clone-in-progress (retired 911-Spec racer) '72 911T Targa MFI 2.4E spec(Formerly "Scruffy") 2004 GT3 |
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09-03-2019, 01:03 PM
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Paradise Garage
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I'm the guy doing the rebuild with Forssling. Making a few Youtube-videos of the rebuild. If you are interested in watching us doing our first Porsche rebuild, watch, like, subscribe etc. You know the drill.
 https://www.youtube.com/channel/UCuWGubdchPUxqA_TFEY36Lg |
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12-11-2019, 06:34 PM
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