Motor mount question 4.0 liter conversion -
LinkBack Thread Tools
post #1 of 1 Old 05-11-2004, 12:52 PM Thread Starter
yellar bellied
Registered User
yellar bellied's Avatar
Join Date: Aug 2003
Location: Calgary
Posts: 62
Motor mount question 4.0 liter conversion

I've got a CJ7 that had the 4.2 and I picked up a 4.0 liter from a 2000 TJ. The problem I've run into is on the drivers side. The three bolt holes that will definantly work with my old 258 motor mounts are all on the same plane. The old motor mount has the upper one of the three in towards the engine by about a 1/4''.

The only way I see to make this work is either to space the lower two out accordingly or to cut or grind the bolt hole to allow for the old mount to be used.
I know the third hole is a metric 12mm and I also am aware of the upper hole in the mount itself requiring some drilling to enlarge it.
I'm very leary about cutting the boss on the block but am also convinced it could be done.

Anybody else run into this problem on that year of engine or similar? And what did you end up doing?

Passenger side was a little bit of work for those that are considering this swap but not that big a deal. The mount had to be ground down somewhat as well as a 1/4" of cast on the block, but it was only a fin running along the boss.

red jeep club member #62 Flip'n'Roll Club founder member #1
1984 CJ 7 with OBII 4.0 liter, NV3550, ARB front, Detroit rear, 4:10's
Full cage, dual Optimas.

To view links or images in signatures your post count must be 10 or greater. You currently have 0 posts.
yellar bellied is offline  

Quick Reply

Register Now

In order to be able to post messages on the 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

Similar Threads
Thread Thread Starter Jeep Forums Replies Last Post
Motor mount tower/motor frame mount location pepto Engines & Drivetrain 3 03-24-2009 02:07 PM
Motor mount question 90roughcountryj Engines & Drivetrain 3 08-09-2004 12:37 AM
Motor Mount lift question?? Nymisus Engines & Drivetrain 6 12-03-2003 12:29 PM
2.5 liter upgrade question BigD1634 Engines & Drivetrain 2 09-22-2002 09:17 PM
2.8 liter and 3.4 liter harmonic balancers the same?? stvdman Engines & Drivetrain 0 02-09-2002 12:58 PM

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