Go Back   Jeep Garage - Jeep Forum > Jeep Platform Discussion > Grand Cherokee - WK > Engine Performance/Intake/Exhaust

Join Jeep Garage Today
Reply
 
Thread Tools Display Modes
 
  #1  
Old 03-12-2014, 09:21 AM
Member
My Jeep: 2008 3.7L WK
 
Join Date: Feb 2012
Location: Shelbyville KY
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 946
whhjr73 is on a distinguished road
catalytic converter

I need to replace my catalytic converter. I've looked through the posts and can't find instructions. How hard is it to remove? Any feed back will be greatly appreciated.
__________________

__________________
Reply With Quote
  #2  
Old 03-13-2014, 04:57 AM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,668
Thanks: 104
Thanked 182 Times in 175 Posts
Rep Power: 11293
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Re: catalytic converter

its not hard, but you will need the whole mid section of the exhaust. summit carries it for 500 and 850$. I think ones a high flow and the other is off road or some thing.

anyway, the transmission cross member needs to come out and the 2 bolts on each manifold need to (probably need to replace as they most likely snap). then you will need to unhook all four o2 sensors. I have had my mid section out like 5 times for various reasons. (mostly performance reasons)
__________________

__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #3  
Old 03-13-2014, 10:23 AM
greenwayer's Avatar
Senior Member
My Jeep: 2005 6.4L WK
 
Join Date: Mar 2013
Location: Sunny California
Posts: 2,020
Thanks: 39
Thanked 81 Times in 72 Posts
Rep Power: 8788
greenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond repute
Quote:
Originally Posted by Strongjeff View Post
its not hard, but you will need the whole mid section of the exhaust. summit carries it for 500 and 850$. I think ones a high flow and the other is off road or some thing. anyway, the transmission cross member needs to come out and the 2 bolts on each manifold need to (probably need to replace as they most likely snap). then you will need to unhook all four o2 sensors. I have had my mid section out like 5 times for various reasons. (mostly performance reasons)
Why can he just cut it out and have a new cat welded in?
__________________
2005 Jeep Grand Cherokee 6.4L (The beast) (Fastest lifted WK)
2012 BMW X5 Turbo'ed (The b*tch)
1998 Jeep Grand Cherokee 4.0L (Ol' reliable)
Reply With Quote
  #4  
Old 03-13-2014, 01:55 PM
brentwoodkris's Avatar
The Ever-Dissatisfied Tinkerer
My Jeep: 2005 5.7L WK
 
Join Date: Jan 2010
Location: Columbia, MO
Posts: 936
Thanks: 0
Thanked 14 Times in 14 Posts
Rep Power: 3600
brentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond reputebrentwoodkris has a reputation beyond repute
Garage
Re: catalytic converter

Quote:
Originally Posted by greenwayer View Post
Why can he just cut it out and have a new cat welded in?
That's what I'm wondering too...

Maybe the 3.7L exhaust system is ridic hard to work on/with compared to the 5.7L.
__________________
'05 WK GC 5.7L HEMI, Goodyear Wrangler SilentArmors, Monroe Reflex Front Struts/Monroe Load Adjusting Rear Shocks, EBC Drilled/Slotted Sport Rotors, Wagner Ceramic Brake Pads, Taylor Shorties, SRT8 Stock CAI Conversion, K&N Drop-in, Block Heater, 18.5% Tint All Around, Boston SE Speakers, 12" Alpine Type-R Sub w/ sealed box w/ RF PRIME R1000-1D, ScanGauge II w/ windshield mount, BT Catch Can w/custom bracket, Swagman Fork Mount Bicycle Rack, WeatherTech front floor liners, SRT8 Pedal Covers, eBay full LED lighting kit, Custom MDS Indicator LED Light, Mega Raizin Voltage Stabilizer & Grounding Kit, Challenger IAT Sensor, Escort Passport 9500ix, Python 5706P RS/Security/KE w/ extras, SA 5 switch panel, Fumoto Oil Valve, Overland WG Steering wheel.
Reply With Quote
  #5  
Old 03-13-2014, 03:03 PM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,668
Thanks: 104
Thanked 182 Times in 175 Posts
Rep Power: 11293
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Quote:
Originally Posted by greenwayer View Post

Why can he just cut it out and have a new cat welded in?
Youd still have to drop the section out to seal the pipe. There is no room to get a welder between the cat and transmission
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #6  
Old 03-13-2014, 04:41 PM
greenwayer's Avatar
Senior Member
My Jeep: 2005 6.4L WK
 
Join Date: Mar 2013
Location: Sunny California
Posts: 2,020
Thanks: 39
Thanked 81 Times in 72 Posts
Rep Power: 8788
greenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond reputegreenwayer has a reputation beyond repute
Quote:
Originally Posted by Strongjeff View Post
Youd still have to drop the section out to seal the pipe. There is no room to get a welder between the cat and transmission
True but he doesn't need to get a whole new mid pipe it will be cheaper to just by a new cat not a whole mid pipe. In fact he doesn't even need to buy a new cat. A catalytic converter when it fails just gets clogged (unless of course he crushed it while off-Roading or something or cracked it). He can just take out his catalytic and wash it and soak it in washing machine soap and water. Another old school trick taught to me by my auto shop teacher in high school lol.
__________________
2005 Jeep Grand Cherokee 6.4L (The beast) (Fastest lifted WK)
2012 BMW X5 Turbo'ed (The b*tch)
1998 Jeep Grand Cherokee 4.0L (Ol' reliable)
Reply With Quote
  #7  
Old 03-13-2014, 05:51 PM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,668
Thanks: 104
Thanked 182 Times in 175 Posts
Rep Power: 11293
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Quote:
Originally Posted by greenwayer View Post
True but he doesn't need to get a whole new mid pipe it will be cheaper to just by a new cat not a whole mid pipe. In fact he doesn't even need to buy a new cat. A catalytic converter when it fails just gets clogged (unless of course he crushed it while off-Roading or something or cracked it). He can just take out his catalytic and wash it and soak it in washing machine soap and water. Another old school trick taught to me by my auto shop teacher in high school lol.
Id be careful if washing them out. Our cats have a ceramic construction inside and it could be weakend if washed. Its very thin and easily broken. Its also harder to find cats in the size needed and the closest magnaflow cats are still 3 inches too long
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #8  
Old 03-13-2014, 06:24 PM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,668
Thanks: 104
Thanked 182 Times in 175 Posts
Rep Power: 11293
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Theres another reason I say get the whole pipe. Trust me, you dont wanna hack it apart. The entire mid pipe up to the cats and just past them has 3 layers to it. The outer 2.5 inch layer you see when you crawl under it. Then there is a metal mesh that runs from the front o2 sensors and INTO THE CATS and stops just after the rear o2's. Then there is a inner layer thats about 2.25 inch that also runs the same lenght as the mesh and it too goes into the cats. If you start to hack it apart you will go thru about 4 or 5 saw blades to get thru it and if you lose any of it, it will be a pita to get lined back up properly and then you'd have this rattle from the exhaust. Thats the number 1 reason I made completely new mids on mine. Trust me if you're gonna replace them, get the whole mid, the cats are built into the pipe.
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #9  
Old 03-13-2014, 10:55 PM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,668
Thanks: 104
Thanked 182 Times in 175 Posts
Rep Power: 11293
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Quote:
Originally Posted by brentwoodkris View Post

That's what I'm wondering too...

Maybe the 3.7L exhaust system is ridic hard to work on/with compared to the 5.7L.
No the exhaust systems are very similar with the 5.7's mids being a 1/4th inch larger in diameter when compared to the 3.7/4.7L's 2.5 inch pipe. Its how its constructed that makes it a pita to do yourself. Also the cost to have a shop replace just the cats is gonna cost more then buying the whole assembly and swapping it out yourself. Autozone has magnaflow universal cats but at 90 bucks a pop plus tax you're over 200 not including shop labor. There is a reason its sold as the whole mid and not just the cats, its not designed to be cut apart.
__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #10  
Old 03-14-2014, 05:36 AM
Strongjeff's Avatar
Project Six Shooter
My Jeep: 2008 3.7L WK
 
Join Date: Sep 2012
Location: Songwon, South Korea
Posts: 4,668
Thanks: 104
Thanked 182 Times in 175 Posts
Rep Power: 11293
Strongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond reputeStrongjeff has a reputation beyond repute
Garage
Re: catalytic converter

here is a pic of a section of factory mid pipe, inner and outer layers. the mesh part removed from when I tried to fit new pipe between the layers.

__________________
2008 JGC, Grey Stone Metallic SRT-6
MODS-http://www.jeepgarage.org/f5/project-six-shooter-build-thread-68955.html
Reply With Quote
  #11  
Old 03-15-2014, 06:42 AM
Member
My Jeep: 2008 3.7L WK
 
Join Date: Feb 2012
Location: Shelbyville KY
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 946
whhjr73 is on a distinguished road
Re: catalytic converter

I want to replace the whole unit. I tried just replacing tge exhaust,but the bolts between the exhaust and cats were rust (the bolt heads came off). So in my stupidity....I cut the flange off right behind where you bolt the 2 together and connected it with a piece of exhaust tube and hangers. Now it rattles...not much. I need to replace the whole thing and start over. I found tge whole cat converter on rock auto got $300. The exhaust part I was going to piece together and have it welded (new thrush turbo muffler)
__________________
Reply With Quote
  #12  
Old 03-15-2014, 06:48 AM
Member
My Jeep: 2008 3.7L WK
 
Join Date: Feb 2012
Location: Shelbyville KY
Posts: 11
Thanks: 0
Thanked 0 Times in 0 Posts
Rep Power: 946
whhjr73 is on a distinguished road
Re: catalytic converter

That's what I tried!! Failed miserably! Now I got to replace the whole unit.
__________________

__________________
Reply With Quote
Reply

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off


Similar Threads
Thread Thread Starter Forum Replies Last Post
Removing catalytic converter magradze Engine Performance/Intake/Exhaust 32 06-18-2012 09:37 PM
4.7L Catalytic Converter replaced jjs4348 Engine Performance/Intake/Exhaust 21 10-20-2011 02:36 AM
new catalytic converter? 99PlatinumWJ Engine Performance/Intake/Exhaust 8 09-23-2011 08:09 PM
Catalytic Converter for 3.7? GCL06 Performance Modifications 20 01-29-2010 05:27 PM
Catalytic converter off? snewt22 Grand Cherokee - WK 13 10-11-2009 09:42 PM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -5. The time now is 08:05 AM.


Powered by vBulletin® Version 3.8.8 Beta 4
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Copyright 2012 - JeepGarage.Org
The Jeep Grand Cherokee Owners Community