Jeep Wrangler Forum - Reply to Topic
Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ Tech Forum > Anyone rebuild the 4.2l

Join Wrangler Forum Today


Thread: Anyone rebuild the 4.2l Reply to Thread
Title:
  
Message:
Post Icons
You may choose an icon for your message from the following list:
 

Register Now

In order to be able to post messages on the Jeep Wrangler Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

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.



Additional Options
Miscellaneous Options

Topic Review (Newest First)
05-19-2013 01:44 PM
c5wagner I had to bore it out a little bit to get rid of the scratched wall, and my engine was already at .050". Everything is fitting like it should, and I decided not to go with the 4.0l head because I don't see it being worth it. The only big change I'm going to do is the howel fuel injection kit and get rid of the POS carter. And nobody needs to worry about me screwing up my block, I'm almost done putting it back together.
05-19-2013 10:21 AM
Nubby55 If you are going to bore and buy new pistons, rings, gaskets and use a 4.0 head anyway, think about using a 4.0 block with your 4.2 Crank Shaft and Rod and build a stroker? 4.7cid
05-19-2013 10:14 AM
Nubby55 These old blocks are get harder to come by so pls don't bore it any larger than need be, there's no real HP gain in just boring a block an extra .020" or .030", then it may be able to be re-bored at a later date.
05-19-2013 07:18 AM
wittmore I live in north-eastern South Carolina - the only advice I can give you is BE CAREFUL - DON'T screw up the block!!!!! Finding replacement blocks is almost impossible - at least within 250 miles of here! Other than that it is just a motor.

One more point - my 1988 YJ 4.2 is a "flat tappet" engine and REQUIRES a zinc-based oil!!!
05-18-2013 11:31 PM
c5wagner Good to here that it isn't too bad, after pulling my engine apart though, I found one cylinder with very slight scratched wall, I'm just going to bore out to allow for slightly bigger pistons .050 to .060, I've also decided to go ahead with the 4.0l head swap.
05-18-2013 01:38 AM
Denverdude2012
Quote:
Originally Posted by c5wagner View Post
I am considering a rebuild for my 4.2l i6. Has anyone done this and have any warnings or problems I could face. I have rebuilt plenty of chevy big blocks so I have the basic experience.
Im doing a full rebuild on my 4.2l right now. Ive helped rebuild everything from old flathead 6's to big block fords and this isnt any harder and easier than anymodern engine. I have a oem shop manual and also cj7 manuals come in handy as its almost identical to 82-86 models. When I have more time ill post more info.
05-17-2013 08:49 PM
c5wagner
Anyone rebuild the 4.2l

I am considering a rebuild for my 4.2l i6. Has anyone done this and have any warnings or problems I could face. I have rebuilt plenty of chevy big blocks so I have the basic experience.

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


All times are GMT -5. The time now is 01:41 PM.



Jeep®, Wrangler, Liberty, Wagoneer, Cherokee, and Grand Cherokee are copyrighted and trademarked to Chrysler Motors LLC.
Wranglerforum.com is not in any way associated with the Chrysler Motors LLC