Engine - JeepForum.com

LinkBack Thread Tools
post #1 of 5 Old 09-07-2015, 05:32 PM Thread Starter
Registered User
1993 YJ Wrangler 
Join Date: Jul 2015
Posts: 43

How do I know if my 6 cyl is a 4.0? Is there 2 sizes of 6'S? My jeep was a 4 and the prevous owner put in a 6. I need a exhaust manifold.

casper32 is offline  
Sponsored Links
post #2 of 5 Old 09-07-2015, 06:05 PM
Registered User
1993 YJ Wrangler 
Join Date: Dec 2003
Location: Morton IL
Posts: 5,580
Give us a picture of the engine.
Who knows what the PO swapped in.

93 YJ SOA 2" springs front, XJ springs rear w/main leaf added, High pinon 9 inch rear detroit locker front Dana 44 ARB 4.56 Gears, 36 inch Irok tires too much to list. www.mijc.org
TSEJEEPERS is offline  
post #3 of 5 Old 09-07-2015, 06:37 PM
Registered User
1991 YJ Wrangler 
Join Date: Aug 2005
Location: Phoenix
Posts: 3,439
Count the number of valve cover bolts. 15=4.0L Less=4.2L head

And,Is the oil pressure port close to the bell housing(4.2L)? Or coming off the distributor boss(4.0L)?

91 YJ Sahara, 4.0L, AX-15/NP231, D30/D35@3.07
12 Cherokee 4x4,3.7L,42RLE/MP1522, D30M/8.25@3.73
Emission test=YES
"Non Vi Sed, Arte"
Drednot is offline  
post #4 of 5 Old 09-07-2015, 07:13 PM
Mike Romain
Registered User
1986 CJ7 
Join Date: Nov 2007
Location: Off the Grid in Chester Grant
Posts: 18,089
The 4.2 has a gas pump in front of the distributor, the 4.0 has a blank space and a pump in the gas tank.

86/00 CJ7 Laredo, 33x9.5 BFG AT's, 'glass nose to tail in '00, 'New' frame,wires and plumbing in '09. Carter BBD Carbed 4.0 HO in '10.
89 YJ Renegade. BBD Carbed 4.0 HO. Locked front and rear with 33x9.5 BFG AT's
Some Canadian Bush Jeep Runs and Build Photos: http://mikeromainjeeptrips.shutterfly.com (10 new albums added Sept 16/10)
Mike Romain is offline  
post #5 of 5 Old 09-07-2015, 07:22 PM Thread Starter
Registered User
1993 YJ Wrangler 
Join Date: Jul 2015
Posts: 43

Thanks Drednot, I have a 4.0

Thanks Mike, Pumps in the tank

Last edited by casper32; 09-07-2015 at 08:11 PM.
casper32 is offline  

Quick Reply

Register Now

In order to be able to post messages on the JeepForum.com forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Please enter a password for your user account. Note that passwords are case-sensitive.


Confirm Password:
Email Address
Please enter a valid e-mail address for yourself.

Email Address:


Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.

Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page

Posting Rules  
You may post new threads
You may 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 On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome