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Join Date: Jul 2002
Location: Solana Beach, CA
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Cat Converter on Carrera
The bracket that holds the cat converter shield on my car is broken. The bracket is mounted by two bolts to the shield and by two bolts to the interface between converter and exhaust. The two bolts to the exhaust system are in pretty bad shape.
What is the best method to break them loose? I'm guess cut the bolt heads with a dremel and then knock out the bolts with a center punch and hammer? Also, when I replace the bolts should I replace the gasket between the cat and exhaust?  
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kb mercedes GLK350 2009 boxster s 86 targa |
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05-31-2008, 10:18 PM
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Join Date: Apr 2002
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Heat is your friend if you have access to it. Mine were in worse condition (couldn't get a wrench on them), so I cut/drilled/cussed them off...a real PITA. Yep on the new gasket.
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06-01-2008, 02:38 AM
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Location: St. Louis region
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You'll find it easier to cut the nuts off, rather than the bolt heads. Bolts are extremely hard, nuts not so much. I used an air chisel.
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Deceased: Black '88 Carrera Coupe, Steve Wong and Russell Berry chips, Dansk premuffler, custom MK GT3-style muffler, Magnecores. Al Reed 7 & 8 X 16 Fuchs. Full Elephant Racing suspension, 21/28 T-bars, Turbo tierods, bump steer kit, Bilstein Sports, BK strut bar. Ruf bumpers, 935 mirrors, Carrera 3.0 tail, DasSport bar. '11 BMW 328iX, '18 Nissan Frontier 4X4, '92 Acura NSX. |
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06-01-2008, 04:21 AM
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THE IRONMAN
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Dremel worked fine for me...
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1984 911 CARRERA RUBY RED TARGA SW CHIPPED-BURSCH CATBYPASS MONTY FREE FLOW EXHAUST <IN GAS WE TRUST> |
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06-01-2008, 04:23 AM
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I drove to Midas where a guy I know used an acetylene torch to melt them away. Charged me $20 and it was almost instant...
Stainless bolts, Permatex?, and gaskets... Last edited by KatoKato; 06-01-2008 at 04:35 AM.. |
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06-01-2008, 04:29 AM
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Diss Member
Join Date: Jul 2002
Location: SC - (Aiken in the 'other' SC)
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Quote:
Most of the antiseize you can find is aluminum based. It is better then nothing but it really isn't that good. Really good antiseize is copper or nickel based. That will insure you can take it apart later.
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- "Speed kills! How fast do you want to go?" - anon. - "If More is better then Too Much is just right!!!" - Mad Mac Durgeloh -- Wayne - 87 Carrera coupe -> The pooch. |
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06-01-2008, 05:38 AM
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I dont have access to heat at home. Once I cut either the bolt head or nut, will the bolt come out or will I need to drill it out?
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kb mercedes GLK350 2009 boxster s 86 targa |
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06-01-2008, 06:25 AM
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Location: Long Beach CA, the sewer by the sea.
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Punch it out and don't worry about that shield. Mine was broken the same way and I tossed it.
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06-01-2008, 08:10 AM
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When I had my muffler and other parts off, that 2 eared bracket had one of the ears broken and the actual guard had one of the mounting ear tabs cracked off towards the front of the guard. I mig welded the bracket ear back on and the mounting tab on the guard was also mig welded. Being these parts are stainless steel, that is what I used in my mig. They came out great, and have been there now close to 4yrs. The muffler to cat does need a new gasket. Your old gasket will probably have bits and pieces that won't want to just pull off, you will need a grinder of some type to get a flat sealing area again. The factory gasket # 911 111 191 01 is what is called for, but a quality 2-1/2" header collector gasket will work. Good luck!! Tony.
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84' Steelslantnose Cab. 1953 Dodge B-4-B-108" 90,127 miles 1953 Dodge B-4-C-116" 58,146 miles 1954 Dodge C-1-B8-108" 241V8 POLY 1973 Roadrunner 440-SIX-PACK* 1986 F-250 Super Cab-460 V8 tow Newest additions- Matching numbers 1973 340 Road Runner!! 1948 Dodge B-1-F-152" 1-1/2 ton Dump body, 39,690 miles others... |
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06-01-2008, 11:24 AM
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When I had my muffler and other parts off, that 2 eared bracket had one of the ears broken and the actual guard had one of the mounting ear tabs cracked off towards the front of the guard. I mig welded the bracket ear back on and the mounting tab on the guard was also mig welded. Being these parts are stainless steel, that is what I used in my mig. They came out great, and have been there now close to 4yrs. The muffler to cat does need a new gasket. Your old gasket will probably have bits and pieces that won't want to just pull off, you will need a grinder of some type to get a flat sealing area again. The factory gasket # 911 111 191 01 is what is called for, but a quality 2-1/2" header collector gasket will work. Good luck!! Tony.
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84' Steelslantnose Cab. 1953 Dodge B-4-B-108" 90,127 miles 1953 Dodge B-4-C-116" 58,146 miles 1954 Dodge C-1-B8-108" 241V8 POLY 1973 Roadrunner 440-SIX-PACK* 1986 F-250 Super Cab-460 V8 tow Newest additions- Matching numbers 1973 340 Road Runner!! 1948 Dodge B-1-F-152" 1-1/2 ton Dump body, 39,690 miles others... |
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06-01-2008, 11:24 AM
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You may find this helpful also:
How do I remove my muffler from the cat?
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'88 Coupe Lagoon Green "D'ouh!" "Marge - it takes two to lie. One to lie, and one to listen" "We must not allow a Mineshaft Gap!" |
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06-01-2008, 12:01 PM
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Thanks for all of the feedback. This really throws a wrench in the process for me. I was thinking about just removing the two bolts so that a new bracket could be mounted. But reading the link that burgermeister posted indicates that I'm going to need heat and the plan to punch out the bolts after I grind the heads probably will not work by itself.
I might just see I some one can weld the broken seam.
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kb mercedes GLK350 2009 boxster s 86 targa |
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06-02-2008, 11:26 AM
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Just cut the thing off. Don't drive in tall grass or piles of dead leaves.
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06-02-2008, 11:32 AM
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Join Date: Apr 2002
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What tcar said! I have a euro premuffler (runs cooler than a cat) so it's unnecessary and I don't have one...it's just a heat shield to protect the ground below from burning.
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06-02-2008, 03:56 PM
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If you drive in inclement weather, the shield also keeps the water / slush off the cat, which probably increases the durability of the steel shell by preventing all that thermal cycling and local quenching caused by every puddle you drive through...
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'88 Coupe Lagoon Green "D'ouh!" "Marge - it takes two to lie. One to lie, and one to listen" "We must not allow a Mineshaft Gap!" |
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06-03-2008, 02:29 AM
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Porsche 914
Porsche 911 Carrera
THE ROADSTER
1988 Porsche 911 3.2
