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Old 07-15-2010, 01:45 PM   #1
monovich
Scooby Specialist
 
Member#: 8124
Join Date: Jul 2001
Location: Denver, Colorado
Vehicle:
1998 Old Grey Mule
Regacy Rype R

Default changing catalytic converter today - any advice?

My front Cat is rattling and throwing codes. Repair shop wanted $400 for the part + labor. I bought the new cat for $135 and am going to do it myself.

The Haynes doesn't say much about cats besides "take it to a muffler shop".

Should I not attempt this? It looks so easy, just a bunch of bolts.

I pre-sprayed the old bolts to loosen them up in case they are a bit stuck, and plan on doing it later this evening.

Should I use a high temp anti-sieze when I reinstall or any other tread compounds?

thx.

-Stephen
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Old 07-15-2010, 02:11 PM   #2
SleekSubyChick
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Member#: 92647
Join Date: Aug 2005
Chapter/Region: MAIC
Location: Baltimore, MD
Vehicle:
14 STi Hatch
Satin White Pearl

Default

Definitely wear eye protection! The last thing you want in your eyes are rust flakes! Trust me!
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Old 07-16-2010, 03:33 AM   #3
Navi271
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Member#: 203099
Join Date: Feb 2009
Chapter/Region: MWSOC
Location: Ankeny/Ames, IA
Vehicle:
1995 Legacy Wagon
Winter Green Metallic

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Even tho you used some pb blaster stuff to loosen the bolts they still like to break... I had to most trouble with the bolts with the springs on the REAR cat. So you shouldn't worry about that, but still. They may break.

It was nice to have a lift for the car so me and my friends could get under the car and get a lot of leverage to unscrew the bolts. idk, Not really sure what happens til you try I guess!
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Old 07-16-2010, 02:07 PM   #4
monovich
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Member#: 8124
Join Date: Jul 2001
Location: Denver, Colorado
Vehicle:
1998 Old Grey Mule
Regacy Rype R

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yup, all the little heat shield bolts are frozen beyond hope. i may sawzall them(?). I cant get to the 4 main bolts and the sensors until the heat shields come off. there sure isn't much room under there for leverage like you said. I Wish I had a lift...
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Old 07-16-2010, 02:08 PM   #5
monovich
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Member#: 8124
Join Date: Jul 2001
Location: Denver, Colorado
Vehicle:
1998 Old Grey Mule
Regacy Rype R

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would an impact wrench help with the big bolts? I have a compressor and buying an impact wrench might be cheaper than paying someone else to do it for me. the big bolts don't appear to be rusted at all but I can't quite loosen them regardless.
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Old 07-16-2010, 02:55 PM   #6
sqc151
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Join Date: Dec 2003
Chapter/Region: Tri-State
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i use an air compressor to and it comes off like butter. yes, wear glasses. rust in the eyes sucks. and besides, ull have the gun for other stuff like taking off ur wheels, changing brakes, blah blah blah. all that good stuff an air gun can do for u.

oh, and dont forget the gaskets.
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Old 07-16-2010, 03:12 PM   #7
Jonathan
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Chapter/Region: NESIC
Location: Natick, MA USA
Vehicle:
1999 Legacy GT Ltd
Quick Silver Metallic

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When I had a "direct fit" catalytic converter installed last month the first thing I did prior to installing it was to spray the exterior with some cleaning solvent and some high-temperature "ceramic" paint.

My old cat literally rusted to pieces, so even though it was still functional, the part that the mid-pipe bolts to was so far gone that it fell off. Hopefully with this special paint it will be a few years before it starts rusting.
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Old 07-16-2010, 04:39 PM   #8
monovich
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Member#: 8124
Join Date: Jul 2001
Location: Denver, Colorado
Vehicle:
1998 Old Grey Mule
Regacy Rype R

Default

I wonder if that rust is an East Coast thing. My car started in Canada then went down to LA for almost a decade and now its in Washington State with me so its never seen road de-icers and all of that. The underside is 98% rust free. The corrosion on the bolts on the cat is definitely rust, but the old cat is not rusted at all.

sqc151 - I'll pick up the impact wrench and try it.. Thanks for the info. I guess it'll help me get more out of my compressor as well because it sits around doing nothing most of the time.
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