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Old 03-12-2014, 01:28 PM   #1
sw201444
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1996 SL1
Default Help! Motor Mounts replaced aaaaaand...

I replaced my motor mounts(old ones were destroyed) and when I let off the brake and let the car coast the whole thing trembles. I have no idea what is causing this... (replaced top and trans mount) I THINK my trans mount is squeaking a little becuae if it idles in park for 2+ min the drivers side has a squeak..

Though the squeaking isnt a huge concern, i am worried about the trembling..

Attached is a pic of the old trans mount ( I shift much smoother now.. )
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File Type: jpg 1621883_756454531031864_1310763660_n.jpg (82.7 KB, 84 views)

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Old 03-12-2014, 02:12 PM   #2
lamping.ap
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Default Re: Help! Motor Mounts replaced aaaaaand...

In what order did you do everything? Did you relieve the pre-load on the passenger side torque strut mount?

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Old 03-12-2014, 03:14 PM   #3
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Default Re: Help! Motor Mounts replaced aaaaaand...

from the way the old mount is mangled it looks to me like you have other problems.

Did it get mangled taking it out?

(I am not a mechanic - just a dude with a keyboard)

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Old 03-12-2014, 03:53 PM   #4
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Default Re: Help! Motor Mounts replaced aaaaaand...

Matthew Broderick is a gifted, talented actor and the toast of Broadway!

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Old 03-12-2014, 04:23 PM   #5
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by lamping.ap View Post
In what order did you do everything? Did you relieve the pre-load on the passenger side torque strut mount?
Took trans mount out. Replaced. Took top mount off. Replaced. Then I went under the car. Loosened the mount on pass side on frame then retightened hoping it would cause less vibrations but it didn't.

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Old 03-12-2014, 04:25 PM   #6
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by dummo View Post
from the way the old mount is mangled it looks to me like you have other problems.

Did it get mangled taking it out?

(I am not a mechanic - just a dude with a keyboard)
Nope. It was like that! 225k miles of mount wear lol.

My mechanic(used to work at saturn) did it. I watched. But I did the bottom mount (loosened then retightened) myself

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Old 03-12-2014, 06:29 PM   #7
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by sw201444 View Post
Nope. It was like that! 225k miles of mount wear lol.

My mechanic(used to work at saturn) did it. I watched. But I did the bottom mount (loosened then retightened) myself
Wow, when I replaced my tranny mount at 90K miles, the rubber was compressed by 4-6 mm and I thought that was bad. You're looked like jackals were chewing on it. Are you sure nothing else is amiss????

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Old 03-12-2014, 06:56 PM   #8
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Default Re: Help! Motor Mounts replaced aaaaaand...

Maybe the trans mount isn't flush with the trans...Just an idea. Did you tighten the mount to the trans first? Then drop the trans the rest of the way and tighten the frame nut?

See the attachment for what mine looked like @ 137,500 mi. My new mount was OEM with an anchor stamp on it. Not sure what your replacement was.
Attached Images
File Type: jpg mount1a.jpg (141.7 KB, 52 views)

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Old 03-12-2014, 07:26 PM   #9
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by sw201444 View Post
Took trans mount out. Replaced. Took top mount off. Replaced. Then I went under the car. Loosened the mount on pass side on frame then retightened hoping it would cause less vibrations but it didn't.
You need to loosen the _bracket_ that that dogbone strut attaches to. Two nuts on studs pointing downward. Then give the powertrain a little shake from above, to "re-seat" the bracket in its elongated holes, and re-tighten.

But ^^^^^ +1 dummo; what's up with the old mount? Looks like there was something out of place, rubbing against it. Maybe it's rubbing against the new mount now. Can you get a shot of the mount as it's installed now?

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Old 03-13-2014, 01:16 AM   #10
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Default Re: Help! Motor Mounts replaced aaaaaand...

The top engine mount & transmission mount are mainly load bearing with the top engine mount getting the big portion of vibration dampening. If the transmission mount was that bad/old....how old are the dog bones?

When I bought aftermarket dog bones & prothane inserts, people were bad mouthing the crap outta the dog bones but I've had them with the inserts at least 60k miles and other than a tad rusty they're good as new. Don't get the prothane inserts if you want a vibration free engine/idle though....they stiffen things up far too much & pass vibrations on rather then absorb them. Doesn't bother me other than really cold mornings when everything imaginable rattles but once it warms up the rattles settle down

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Old 03-14-2014, 08:20 AM   #11
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by madpogue View Post
You need to loosen the _bracket_ that that dogbone strut attaches to. Two nuts on studs pointing downward. Then give the powertrain a little shake from above, to "re-seat" the bracket in its elongated holes, and re-tighten.

But ^^^^^ +1 dummo; what's up with the old mount? Looks like there was something out of place, rubbing against it. Maybe it's rubbing against the new mount now. Can you get a shot of the mount as it's installed now?
Not without a lift.. I have no jackstands at home.

I dis the passenger side dogbone. should i do the top/drivers DB too?

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Old 03-14-2014, 08:21 AM   #12
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by fetchitfido View Post
The top engine mount & transmission mount are mainly load bearing with the top engine mount getting the big portion of vibration dampening. If the transmission mount was that bad/old....how old are the dog bones?

When I bought aftermarket dog bones & prothane inserts, people were bad mouthing the crap outta the dog bones but I've had them with the inserts at least 60k miles and other than a tad rusty they're good as new. Don't get the prothane inserts if you want a vibration free engine/idle though....they stiffen things up far too much & pass vibrations on rather then absorb them. Doesn't bother me other than really cold mornings when everything imaginable rattles but once it warms up the rattles settle down
Yeah, see these rattles are only bad when car is still warming.. then the squeaking starts to kick in when the vibrating stops...

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Old 03-14-2014, 08:24 AM   #13
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by lamping.ap View Post
Maybe the trans mount isn't flush with the trans...Just an idea. Did you tighten the mount to the trans first? Then drop the trans the rest of the way and tighten the frame nut?

See the attachment for what mine looked like @ 137,500 mi. My new mount was OEM with an anchor stamp on it. Not sure what your replacement was.
My mount was replaced at 225,000 that's why it's so mangled,everyone.

Also, I'm not sure, can I just go under the car(like the pass side dogbone) and loosen it, shake, then tighten?

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Old 03-14-2014, 08:40 AM   #14
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by sw201444 View Post
My mount was replaced at 225,000 that's why it's so mangled,everyone.

Also, I'm not sure, can I just go under the car(like the pass side dogbone) and loosen it, shake, then tighten?
You don't have to go under the car. Take the resonator, the air box and the battery box out and you can get to the dog bone that way.

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Old 03-16-2014, 01:20 PM   #15
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Default Re: Help! Motor Mounts replaced aaaaaand...

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You don't have to go under the car. Take the resonator, the air box and the battery box out and you can get to the dog bone that way.
So I should replace that one?

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Old 03-16-2014, 05:02 PM   #16
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Default Re: Help! Motor Mounts replaced aaaaaand...

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So I should replace that one?
If the rest of the mounts were bad, then I would say yes. Again, only OEM, as the aftermarket ones have a softer rubber and wont last.

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Old 03-18-2014, 08:26 PM   #17
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Default Re: Help! Motor Mounts replaced aaaaaand...

Quote:
Originally Posted by Madness10 View Post
If the rest of the mounts were bad, then I would say yes. Again, only OEM, as the aftermarket ones have a softer rubber and wont last.
UPDATE FOR ALL.
I went and replaced my top mount with my old one.. and what do you know, the newer top mount (with less miles) was causing all the vibrations! Rides like a new car with 225k miles on it... lol

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