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Go Back JeepForum.com > Models > Jeep Grand Cherokee & Commander Forums > ZJ Grand Cherokee Forum > 98 4.0 motor mount replacement

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Unread 09-15-2013, 11:16 AM   #1
coralman
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1998 ZJ 
 
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98 4.0 motor mount replacement

Replaced my mounts in prep of doing the manifold/header work. First thing was to remove the airbox. 3-13mm bolts. They have nuts on the other side so don't let them get away from you. Then remove the steering box cover which is 1-13mm nut.

mounts2-001rs.jpg mounts2-002rs.jpg

You can see the upper mount to frame bolts, and now have a little more room to move around. But first jack the motor up just a bit to support it. I used a 6x6 block underneath the deep part of the pan but clear of the raised portion for the drain plug. The mount rear upper bolt is obstructed by the steering shaft and I used a crow foot to break it loose and a cocked socket to remove it. All mount to frame bolts are 15mm. The lower sill bolts are easy to remove with standard stuff. I put some penetrant on the 18mm mount through bolt and removed it. I played around with the jack until I had the least amount of tension on the bolt and tapped it out with a rubber mallet as far as it would go, then used a long extension against the head of the bolt to drive it the rest of the way out. I used a small pry bar to break the mount loose.

Getting it out of there was kinda a pain and I wound up taking the fuel line support brackett off the manifold for wiggle room to get it up and over enough to bring it out above the vehicle end of the upper control arm.

mounts2-003rs.jpg mounts2-004rs.jpg

mounts2-005rs.jpg mounts2-006rs.jpg

mounts2-010rs.jpg mounts2-011rs.jpg

mounts2-014rs.jpg

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Unread 09-15-2013, 12:08 PM   #2
coralman
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Continuation. Once the old one was out it looked pretty bad, compressed and cracked. The exhaust leak probaly had taken its toll also. I will make a heat shield when the new exhaust goes in. Compared to the new one there was quite a difference. The new mount bottom mounting points looked different but it made no difference. Install all the bolts loosely as they will get torqued down once the weight is on both mounts. I had to raise the motor another 1/2 inch to get the through bolt back in. Install the fuel line brackett.
mounts2-018rs.jpg mounts2-019rs.jpg

mounts2-020rs.jpg

The right side was alot easier. Taking the 18mm through bolt out was easier to do from the bottom. The 4 15mm bolts for the mount were easier too except the bottom bolt closets to the firewall wanted to get trapped. So I used a flex ratchet wrench to get it out. I guess cause I had raised the motor 1/2 inch on the other side the through bolt just pulled right out without coaxing. The mount came out between the rubber discharge and suction lines. This side didn't look as bad as the left side but it needed to go. Install mopar mount#52058502 back in the same way. Install the bolts loosely until the jack is gone. I final tightened the bolts in this sequence, lower mount bolts, upper mount bolts, through bolt. Tighten all mount bolts to 48ft lbs.and the through bolt to 89ft lbs and you are good to go.

mounts3-005rs.jpg mounts3-006rs.jpg

mounts3-008rs.jpg mounts3-009rs.jpg

mounts3-010rs.jpg

After the trans and motor mounts were installed I noticed a good deal of elemination of in cab vibrations. Was definately worth the work.
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Unread 09-15-2013, 04:38 PM   #3
Oldfrog
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1997 ZJ 
 
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Great write up, coralman !
This repair is on my list, so your write up will be especially helpful and save time. Thanks !
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Unread 09-15-2013, 04:56 PM   #4
coralman
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YW Oldfrog! I just do these to rake in the millions for technical writing .
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Unread 09-20-2013, 09:16 PM   #5
Uniblurb
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Real nice write-up coralman and great photos too! I'm sure in just turning over 200K my mounts could use replaced too!
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Unread 09-21-2013, 04:14 AM   #6
Oldfrog
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Millions, I tell ya !
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Unread 05-03-2014, 12:52 PM   #7
tucsonzj
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really need to do this, just dreading it haha. Great write up!
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Unread 05-03-2014, 03:19 PM   #8
AVR2
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On my 93 4.0L, you have to remove the oil filter adapter to get the passenger side through-bolt out. Fortunately, I have an early 93 (actually built in mid-92) which uses a standard 16mm hex head on the filter adapter bolt.
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Unread 05-03-2014, 03:59 PM   #9
coralman
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Thanks for the addition AV!
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