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Unread 03-05-2013, 01:44 PM   #1
jeep93GCL
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1993 ZJ 
 
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motor mounts

Hey has anybody change their motor mounts on their jeeps is hard and how many mounts is it. When I drive the vibrations goes away when I stop at a red light or stop if vibrates but once I drive away it goes away I was thinking it was the motor mounts has anybody had this problem before....

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Unread 03-05-2013, 02:02 PM   #2
xcaliber81
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I do exact same thing however by tuning it up and putting feel cleaner in the tank I am narrowing it down to old dirty injectors and worn mounts.
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Unread 03-05-2013, 02:20 PM   #3
a20ftsloth
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Correct me if I'm wrong but I think it might be two. I'd probably just google it if I were you. Just crawl under there and see if they're dry rotted. But honestly if it goes away at high rpms then it's not the mounts. If I were you I would get in the car, drive down the block, and stop but keep it in drive. Try putting it in neutral and if the vibrations go away then it's your tranny. The best solution is to go home, pull the parking brake, put the car in neutral with the car still on, and check the transmission fluid. If I'm right then you're going to want to add some fluid and that should help it. Basically your tranny is still grabbing the engine a bit at stop and that's what causing the vibrations. So ill say it again; parking brake, turn engine on, put in neutral, and fill tranny till full.
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Unread 03-05-2013, 02:27 PM   #4
Scopez
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What motor? To test worn motor mounts, put the jeep in drive, hold the brake and give it a little gas. Do the same in reverse. If your motor moves any, more than likely bad mounts.

I suggest IronMan4x4fab mounts. I ordered some, but I haven't received them yet. I just heard very good things about them.
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Unread 03-05-2013, 02:30 PM   #5
xcaliber81
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My tranny is full and it does it mine is slowly diminishing over time I'm thinking my issue is old dirty injectors or worn mounts more gearing towards the trans mount.
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Unread 03-05-2013, 02:53 PM   #6
CanaanTSA5
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Quote:
Originally Posted by jeep93GCL View Post
Hey has anybody change their motor mounts on their jeeps is hard and how many mounts is it. When I drive the vibrations goes away when I stop at a red light or stop if vibrates but once I drive away it goes away I was thinking it was the motor mounts has anybody had this problem before....
The I6 4.0 has 2 mounts. The mounts them selves are easy to replace. The only snag is that you need to lift up your motor to do it.

I am currently dealing with the same kind of vibration issue. When I come to a stop, the front end will shake. Sometimes violently, sometimes just lightly. In my case, I narrowed it down to more than one thing wrong. My transmission wouldn't downshift properly (Gears 2 and 1). The converter lockup valve in the transmission valvebody was sticking.

I put in some Automatic Transmission Treatment fluid and that solved the vibration issue about 75%. I'm assuming that it also needs motor and transmission mounts as well. It's 14 years old and gets the hell beat out of it. Not really what the stock mounts were intended for.

Other than that, you could try cleaning your IAC. That's what's next on my list before I spend the money for mounts.
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Unread 03-05-2013, 02:54 PM   #7
biggoofy
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If you want to upgrade while you swap check out ironman4x4fab.com. They have motor and trans mounts for all Zj models.
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Unread 03-05-2013, 06:29 PM   #8
coralman
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I think he was looking for a how to, I wouldn't mind knowing myself.
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Unread 03-05-2013, 07:10 PM   #9
KoreaZJ
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Replace all three, L/R engine and rear tranny.

Not a ZJ, but similar to this...
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Unread 03-05-2013, 09:07 PM   #10
coralman
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I was just wondering about the board under the oil pan thing, if it was the accepted method Thanks Korea.
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Unread 03-05-2013, 11:07 PM   #11
Afdude88
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The board idea should be ok. The idea is to distribute the motor weight across the board versus a the smaller area of a jack's head. I have done this before on other vehicles without problems.

1993 Grand Cherokee Limited 4.0L AW-4
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Unread 03-06-2013, 01:49 AM   #12
AVR2
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I used the block of wood under the oil pan on my 4.0L. No problem. It's the recommended procedure in Haynes, can't remember what the FSM says.

The driver's side mount is the one where access can be an issue. I've seen people change it as-is, but I took a few minutes to pull the airbox, and voila - plenty of room.
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Unread 03-06-2013, 05:25 AM   #13
coralman
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.....and the gear shaft? Some say remove or pry on, nothing in the fsm about that. I was just thinking I would tackle the mounts while doing all the rework on the sus./strg systems.
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Unread 03-06-2013, 05:37 AM   #14
AVR2
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You mean the steering shaft? There's just enough room between it and the frame to get a socket onto the bolts underneath it. That wasn't a problem at all.
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Unread 03-06-2013, 05:44 AM   #15
coralman
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Cool, thanks for the replies !
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