Motor mounts
#1
Newbie
Thread Starter
Join Date: Mar 2016
Location: Missouri
Posts: 28
Likes: 0
Received 0 Likes
on
0 Posts
Year: 2001
Model: Cherokee
Engine: 4.0
Motor mounts
Ok I'm a newb to the jeep scene. I see a lot of people talking of changing their motor mounts. Is this a common problem on an Xj or is their a benefit to changing them?
#3
Senior Member
Join Date: Jun 2014
Location: Eagle River, Alaska
Posts: 925
Likes: 0
Received 6 Likes
on
6 Posts
Year: 1999
Model: Cherokee (XJ)
Motor mounts go bad over time and can have many adverse effects on other parts of the jeep. Cracked manifold is one of the possible side effects of bad engine mounts. It is definitely something that needs to be monitored to ensure everything runs like it should.
Something like this is not holding the engine like its supposed to...
Something like this is not holding the engine like its supposed to...
#4
Senior Member
Join Date: Nov 2012
Location: Harrisburg, Pennsylvania
Posts: 918
Likes: 0
Received 3 Likes
on
3 Posts
Year: 1995
Model: Cherokee
Engine: 4.0L HO
If you really want good/long lasting mounts and don't mind a little extra vibration you can go with Brown-Dogs or other similar "heavy-duty" aftermarket mounts (a metal mount with a round rubber/poly bushing, rather then the OE "rubber blocks") which while a little expensive (about $100/pair) will likely never need to be replaced again.
http://browndogindustries.com/CU2572...ts-Rubber.aspx
http://browndogindustries.com/C2572-...unts-Poly.aspx
#6
CF Veteran
Join Date: Mar 2010
Location: Georgia
Posts: 1,438
Likes: 0
Received 8 Likes
on
8 Posts
Year: 99 94
Model: Cherokee (XJ)
Engine: I6
Forget the brown dogs and get the o.e.m mounts or whatever brand advance/autozone etc. The brown dogs have a ton of extra vibration. Horrible with the ac on.
#7
CF Veteran
Join Date: Jun 2011
Location: Louisville,KY
Posts: 8,014
Likes: 0
Received 16 Likes
on
16 Posts
Model: Cherokee
The 4.0 is big and kinda heavy which is hell on motor mounts and you throw in vibrations mounts won't last that long,And even driving habits can wear them out faster if you drive it hard.
Trending Topics
#8
Senior Member
Join Date: Nov 2014
Location: Lennox/Sioux Falls South Dakota
Posts: 892
Likes: 0
Received 4 Likes
on
4 Posts
Year: 1996
Model: Cherokee (XJ)
Engine: 4.0 liter inline 6
I got bad motor mounts, so does my parts jeep and so did my xj. so yes a common issue change them as soon as ya can.
#10
Newbie
Join Date: Oct 2015
Location: Elkhart,In
Posts: 7
Likes: 0
Received 2 Likes
on
1 Post
Year: 2000
Model: Cherokee
Engine: I-6
The following 2 users liked this post by Jerry in Indiana:
Classic96XJ (06-11-2021),
robertj (02-02-2022)
#11
Moderator CF K9-unit
Join Date: Apr 2012
Location: Alaska
Posts: 5,842
Likes: 0
Received 9 Likes
on
8 Posts
Year: 2000 sport
Model: Cherokee (XJ)
Engine: New 4.0l from s&j engines
I'm running Brown Dog rubber mounts and have zero vibes. Took about 500-600miles for them to break in good.. At first yes there was a slight and I mean slight vibe, but now its great.. The through bolt is not torque specific most ppl over tighten them and get mad vibes. I'm glad I went BD motor mounts.
Here is a vid from my dash cam stuck to windshield with cheap mount(picks up every little pump or vibe).. You can read the lic on the car.. You can see if there was a bad vibe the vid would show it.. Looks smooth on vid and feels good and solid.
Here is a vid from my dash cam stuck to windshield with cheap mount(picks up every little pump or vibe).. You can read the lic on the car.. You can see if there was a bad vibe the vid would show it.. Looks smooth on vid and feels good and solid.
The following users liked this post:
robertj (02-02-2022)
#12
CF Veteran
Join Date: Jul 2013
Location: Monett, MO.
Posts: 7,554
Likes: 0
Received 15 Likes
on
15 Posts
Year: 1999
Model: Cherokee
Engine: 4.0
If left to long this can happen to the block, not good the bolt for the motor is what broke the block. But can be repaired use the Brown Dog motor mount setup that uses 6 holes for mounting instead of 3.
#13
I'm running Brown Dog rubber mounts and have zero vibes. Took about 500-600miles for them to break in good.. At first yes there was a slight and I mean slight vibe, but now its great.. The through bolt is not torque specific most ppl over tighten them and get mad vibes. I'm glad I went BD motor mounts.
Here is a vid from my dash cam stuck to windshield with cheap mount(picks up every little pump or vibe).. You can read the lic on the car.. You can see if there was a bad vibe the vid would show it.. Looks smooth on vid and feels good and solid.
That's a long redlight...lol
Almost Bud - YouTube
Here is a vid from my dash cam stuck to windshield with cheap mount(picks up every little pump or vibe).. You can read the lic on the car.. You can see if there was a bad vibe the vid would show it.. Looks smooth on vid and feels good and solid.
That's a long redlight...lol
Almost Bud - YouTube
#14
CF Veteran
no issues here. torqued properly, and broken in. I can cruise around town, the highway, the mountain with AC on full bore, no vibes.
The following users liked this post:
robertj (02-02-2022)
#15
Banned
Join Date: Feb 2014
Location: Florida
Posts: 2,379
Likes: 0
Received 17 Likes
on
16 Posts
Year: 2000
Model: Cherokee(XJ)
Engine: Golen 4.6L
In addition to their motor mounts, Brown Dog also sells a set of replacement engine brackets that are thicker, so that the bolts torque against the bracket instead of the bottom of the hole. The original brackets only used four holes on one side and three on the other. The BD replacements use additional holes in the block that were tapped at the factory but never used, seven on one side and eight on the other. If you install these brackets with their motor mounts, your engine is definitely going to stay where you put it no matter what kind of abuse you put to your Jeep.
Here's a pic of their "Super Kit" with the brackets and motor mounts:
Regarding the motor mounts themselves, BD offers a polyurethane version and a hard rubber version. The poly version is harder and would naturally transmit more vibration, but the rubber version isn't exactly soft. One good thing about this design is that although it's made to last a very long time, if you ever needed to replace them you would only need to replace the insert bushings. And even if the bushing is worn out, you can bang those suckers all around and never lose the mount completely because the main mounting bolt is trapped in the steel tube.
I have the full BD kit with rubber bushings that I installed with my stroker. At first it vibrated like a massage chair, but it has calmed down considerably after breaking in. I really don't understand the whining about the vibrations. It's a frickin' Jeep, not a Range Rover.
The following users liked this post:
drknots (02-22-2021)