'79 258 smog pipe threads? - JeepForum.com
Search  
Sign Up   Today's Posts
User: Pass: Remember?
Advertise Here
Jeep Home Jeep Forum Jeep Classifieds Jeep Registry JeepSpace Jeep Reviews Jeep Gallery Jeep Clubs Jeep Groups Jeep Videos Jeep Events Jeep Articles
Go Back JeepForum.com > Models > Jeep CJ Forum > '79 258 smog pipe threads?

Dana 30/ Dana 44 Chromoly shaft Kits- ECGSFS: 2007-2013 Jeep Wrangler "HALO" Angel Eye KitFlowmaster's Force II Axle-back exhaust system for the 201

Reply
Unread 07-09-2011, 11:43 AM   #1
JDeereGn
Registered User
1986 CJ7 
 
Join Date: Mar 2010
Location: piney woods, louisiana
Posts: 234
'79 258 smog pipe threads?

If I remove the smog pipe from the manifold what are the threads needed to plug the holes? I have seen some info saying bolt and some that say pipe (NPT). thanks to all that have answered my questions in the past

__________________
http://s1208.beta.photobucket.com/user/JDeereGn/library/
"All gave some - some gave all"
JDeereGn is offline   Reply With Quote
Unread 07-09-2011, 12:25 PM   #2
mopar408
Registered User
1974 CJ5 
 
Join Date: Jan 2011
Location: new braunfels, tx
Posts: 1,361
they are NOT NPT, they are flare nuts. I'm almost positive they are like a 9/16 SAE thread, really oddball on purpose to keep you from going to FLAPS and easily bypassing emissions hardware. Exactly why you always see 'em welded shut and not plugged,
__________________
If it's good TO you, it's gotta be good FOR you....
mopar408 is offline   Reply With Quote
Unread 07-09-2011, 12:47 PM   #3
1986cj
Registered User
1986 CJ7 
 
Join Date: Dec 2007
Location: Denver Colorado
Posts: 1,873
You talking the Egr pipe, or the air injection manifold pipe? Never mind I dont know why I read you had a 1979. Old age I guess
1986cj is online now   Reply With Quote
Unread 07-09-2011, 12:48 PM   #4
hp_lovecraft
Registered User
1981 CJ5 
 
Join Date: Sep 2009
Location: Maine
Posts: 966
I was never able to find a bolt that matched the threads at the hardware store. Others have said they had luck getting something that worked in the plumbing section.

Instead, I ended up filling them full of muffler epoxy, and covered them with a piece of the old piping.
hp_lovecraft is offline   Reply With Quote
Unread 07-09-2011, 01:00 PM   #5
1986cj
Registered User
1986 CJ7 
 
Join Date: Dec 2007
Location: Denver Colorado
Posts: 1,873
I just looked at one in the garage on my bench, and 9/16" may be about right but not a pipe thread. Looks to be a fine thread. May be able to find one in brass but for sure it is not a NPT, or none I have ever seen.
1986cj is online now   Reply With Quote
Unread 07-09-2011, 01:14 PM   #6
JDeereGn
Registered User
1986 CJ7 
 
Join Date: Mar 2010
Location: piney woods, louisiana
Posts: 234
The pipe isn't hurting anything and the pump was removed by PO. I want to put a manual choke cable on the BBD and it looks like the smog pipe is in the way. Isn't the manifold cast? I can't weld cast and certainly don't want to remove it to weld. Pulling the carb would be much easier to install the choke.
__________________
http://s1208.beta.photobucket.com/user/JDeereGn/library/
"All gave some - some gave all"
JDeereGn is offline   Reply With Quote
Unread 07-09-2011, 01:16 PM   #7
JDeereGn
Registered User
1986 CJ7 
 
Join Date: Mar 2010
Location: piney woods, louisiana
Posts: 234
If it's flare and it looked to be it certainly isn't NPT. Fine thread bolt maybe? I don't want to remove them till I have the proper plugs. Thanks
__________________
http://s1208.beta.photobucket.com/user/JDeereGn/library/
"All gave some - some gave all"
JDeereGn is offline   Reply With Quote
Unread 07-09-2011, 10:03 PM   #8
cdmiller2
Registered User
1981 CJ5 
 
Join Date: Apr 2011
Location: madison, wi
Posts: 256
I was able to put pipe plugs in my 81 258, I cant remeber the size.
cdmiller2 is offline   Reply With Quote
Unread 07-10-2011, 08:34 AM   #9
halpeters
Registered User
1978 CJ7 
 
Join Date: Apr 2008
Location: Central Florida
Posts: 255
Here is a link to a set of bolt plugs for an AMC 360...

http://www.teamgrandwagoneer.com/parts/Emissions/more2.html

OOPS - these won't fit the AMC 258 exhaust manifold...

Hal
__________________
1978 CJ-7
halpeters is offline   Reply With Quote
Reply
Thread Tools


Suggested Threads





Jeep, Wrangler, Cherokee, Grand Cherokee, and other models are copyrighted and trademarked to Jeep/Chrysler Corporation. JeepForum.com is not in any way associated with Jeep or the Chrysler Corp.