Pretty sure my 4.2L is fudged - Jeep Wrangler Forum

Go Back   Jeep Wrangler Forum > YJ Jeep Wrangler Forum > YJ General Discussion Forum

Join Wrangler Forum Today

Thread Tools

Please support our sponsors and let them know you heard about them on
Old 09-27-2009, 03:07 PM
Thread Starter
Join Date: Aug 2009
Location: Toronto
Posts: 47
Mystake is on a distinguished road
Pretty sure my 4.2L is fudged

I've got good reason to believe my 4.2L is fudged.

at the very least, I'm sure there are quite a few problems with it (the ring on the positive cable that wraps onto the battery terminal is rusted and broke in half for starters), I think my start motor is either crap or the block is seized... just a myriad of problems.

As far as I can tell though, the transmission is good. I can't really ifnd out because the YJ isn't driveable. I saved this one from the junkyard by a few hours and quite frankly it deserved nothing more THAN to be junked..

but I couldn't let it go. I paid 200$ for it and trailered it to its new home at my university house's garage where it sits.

It sat for 5 years... to give a bit of background as to how much anything and everything can be wrong with it.

I'd like to swap in a 360 Magnum V8 into it.

People have done 350 Chevys... well I'm a mopar guy. I can't do a chevy in a Jeep. If a 350 can fit... so can a 360... right?

That and I have a 360 in the Durango so it makes sense for me to stick to an engine I am mildly familiar with.

Has anyone done a magnum v8 swap? I know there are a TON of electronics... so I'd debate finding an LA360 instead.
1989 Jeep YJ. Not driveable: no brakes for one, no floors for two, too much rust for three.

2001 Dodge Durango. 5.9L, All Wheel Drive. Fully Loaded. 15inch Subwoofer, 52mm ThrottleBody(stock is 48mm), 14inch round K&N air filter.
Mystake is offline   Quote
Old 09-27-2009, 03:55 PM   #2
Join Date: Sep 2009
Posts: 30
hiram is on a distinguished road
find a magnum v8 at a junk yard pull the all the harnessess and any wires. try and get the tranny and transfercase too. set the motor in after it is cleaned up and modified the way you want, it drop it in and set the motor as far back as possible, this is where you build your motor mount. this is the beginining.

hiram is offline   Quote
Old 09-27-2009, 08:17 PM   #3
buckshot500's Avatar
Join Date: Mar 2009
Location: Carolina
Posts: 798
buckshot500 is on a distinguished road
I've read elsewhere that if you can find a Dakota V6 with a manual trans, the bell house will mate a small block V8 to an AX/15.

Also I'd try pulling the starter and prying the 4.2L's flywheel teeth with the trans in neutral, the ignition off & the wheels well chocked. If it moves, take the starter to a big box parts store for free testing.

An engine swap is a lot to go through if you didn't need it in the first place. A battery terminal is also easily replaced.
90YJ 98XJ
buckshot500 is offline   Quote

Thread Tools

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
All SYE pretty much the same ?? meyers TJ Tech Forum 8 07-31-2009 04:35 PM
4.2L overhaul whiteelf YJ Tech Forum 2 12-13-2006 03:40 PM
running temp of 4.2l jeepercreeper77 YJ Tech Forum 1 12-13-2006 11:04 AM

Download our Mobile App

» Featured Product

All times are GMT -5. The time now is 08:10 PM.

User Alert System provided by Advanced User Tagging v3.1.0 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.
vBulletin Security provided by vBSecurity v2.2.2 (Pro) - vBulletin Mods & Addons Copyright © 2017 DragonByte Technologies Ltd.

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

Enter your email address:

Delivered by FeedBurner