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Cat - What is this screw for ?
So I had to put the cat back on the car (now required for inspection every year, sigh). The exhaust had gained an annoying whistle, and on inspection, I noticed that there seems to be a bolt missing from this hole in the cat (before the core). The pic is of another cat btw.
So, the questions are; 1. What size/type of bolt can I stick in here to plug it (nothing I have on hand seems to fit) 2. What the heck is this bolt here for? 
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08 Porsche Cayman (base) <- My hands are too big to need to compensate with an S 86 911 Coupe <- WOOT <- sadly gone since late 2014 |
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10-27-2008, 04:23 PM
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Join Date: Oct 2003
Location: Michigan
Posts: 14,093
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For attaching the heat shield, maybe?
Remember those threads are metric. Either take it down to the local hardware store and trial fit until you find one or find one close and rethread it using a socket wrench on the bolt.
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1981 911SC ROW SOLD - JULY 2015 Pacific Blue Wayne |
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10-27-2008, 04:27 PM
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Virginia Rocks!
Join Date: Oct 2003
Location: Just outside the beltway
Posts: 8,497
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That's the test bung, hence why it's in front of the core.
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Rosewood 1983 911 SC Targa | Black 1990 944 S2 | White 1980 BMW R65 | Past: Crystal 1986 944 na Guards Red is for the Unoriginal
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10-27-2008, 04:59 PM
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Registered
Join Date: Nov 2005
Location: CA
Posts: 7,286
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if you take it off, you will see your rpm jump lot quicker
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Fat butt 911, 1987 |
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10-27-2008, 05:10 PM
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Registered
Join Date: Oct 2001
Location: San Carlos, CA US
Posts: 5,541
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You remove it and install a CO reader for testing purpose. It is so rusted now it will just snaps off if you even breath on it.
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Porsche 2005 GT3, 2006 997S with bore-scoring Exotic: Ferrari F360F1 TDF, Ferrari 328 GTS Disposable Car: BMW 530xiT, 2008 Mini Cooper S Two-wheel art: Ducati 907IE, Ducati 851 |
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10-27-2008, 07:23 PM
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Any idea what size it is? a 1/4" bolt slides in easily so I am guessing 7-9mm. Should i worry about what kind of metal I use for the bolt I stick in there? I don't like the idea of exhaust pointing straight at the tire (plus the whistle is annoying)
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08 Porsche Cayman (base) <- My hands are too big to need to compensate with an S 86 911 Coupe <- WOOT <- sadly gone since late 2014 |
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10-28-2008, 03:05 AM
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Slumlord
Join Date: May 2001
Location: Canada
Posts: 4,983
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If a 1/4" bolt goes inside it is likely M8. And it probably needs re-tapping. Then put in a stainless steel bolt with anti-seize.
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84 Cab - sold! 89 Cab - not quite done 90C4 - winter beater |
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10-28-2008, 06:56 AM
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Get off my lawn!
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As I remember from somewhere it is the same thread as a spark plug. I may be thinking of the O2 sensor.
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Glen 49 Year member of the Porsche Club of America 1985 911 Carrera; 2017 Macan 1986 El Camino with Fuel Injected 350 Crate Engine My Motto: I will never be too old to have a happy childhood! |
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10-28-2008, 06:59 AM
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Carrera
