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Old 01-06-2011, 03:28 AM   #1
frankv569
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Default vibration after changing engine mounts

I replaced 3 of the 4 engine mounts with Anchor brand mounts from Rockauto.com- the only one I have yet to change is the mount beneath the crank pulley.
My problem is that I am still getting a lot of vibration. It actually feels worse than when my oem (disintegrated) mounts were in place.
Is this expected? Normal?? Has anyone else had this happen?

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Old 01-06-2011, 03:52 AM   #2
madpogue
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1996 SW2
Default Re: vibration after changing engine mounts

With that brand of mount, it's entirely expected (but NOT "normal"). We've determined that "Anchor" actually refers to their best use (well, if they were heavier...).

You need an OEM top mount, for starters. For the bottom left transmission mount, there's a photo laying around here somewhere, showing how a BRAND NEW Anchor mount was actually FLATTER (less "lift") than a sagged-out compressed end-of-its-life OEM mount.

The struts ("dog-bones") aren't as critical to ride quality, but the Anchor brand are known to break. One semi-cheap option is to find a couple of dog-bones from a '98-up (or is it '99-up?) car, with the latest design, and replace the rubber inserts with Prothane urethane inserts, available online and from Summit Racing (and SDA, if memory serves). Makes the ride a little harsh, however.

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Old 01-06-2011, 10:23 AM   #3
OldNuc
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1998 SC2
Default Re: vibration after changing engine mounts

The 3rd design torque axis struts (dog bones) were fitted on late production 97 model year cars. And probably on all of the 98s. the life of the trans and top mount are extended greatly bey using the polly inserts in the dogbones. But if you are expecting the same level of performance/smoothness that is obtained with a 4 cylinder engine that has a dynamic balance shaft you are dreaming.

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Old 01-06-2011, 10:28 AM   #4
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2002 SC2
1998 SL2
Default Re: vibration after changing engine mounts

Quote:
Originally Posted by frankv569 View Post
I replaced 3 of the 4 engine mounts with Anchor brand mounts from Rockauto.com- the only one I have yet to change is the mount beneath the crank pulley.
After you replaced the top mount, did you loosen the two bolts for the one below the crank pulley and retorque them?

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Old 01-06-2011, 01:10 PM   #5
SLCraig
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1996 SL2
2000 SW2
Default Re: vibration after changing engine mounts

Quote:
Originally Posted by OldNuc View Post
The 3rd design torque axis struts (dog bones) were fitted on late production 97 model year cars. And probably on all of the 98s. the life of the trans and top mount are extended greatly bey using the polly inserts in the dogbones. But if you are expecting the same level of performance/smoothness that is obtained with a 4 cylinder engine that has a dynamic balance shaft you are dreaming.
Funny you mention this because it is incredibly obvious when I drive the 96 and then the 00, the difference in engine smoothness. The 2000 runs like a top. The 96 runs smooth looking as well from standing at the front end, but the minute you get in the car and start driving it is just not as smooth as 3rd generation's DOHC engine. If the clutch in the 3rd gen was better it would be an ideal car. I guess I'll have to change that down the road!

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Old 01-06-2011, 01:20 PM   #6
Disophisis
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Default Re: vibration after changing engine mounts

I replaced my top mount on my 93 with an Anchor brand mount something like a year and a half ago, I think. It's been doing pretty well. The motor actually had to be raised a bit with the new mount because the old one was sagging so badly.

Just thought I'd give my experience, which has been ok. the car rumbles a bit but it's a 93 saturn, so I think some is normal at least. It is better than with the previous mount though.

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Old 01-07-2011, 08:36 PM   #7
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Default Re: vibration after changing engine mounts

just changed all my mounts out...the top was OEM, the transmission mount is also OEM..AFTER I tried to cheap out on the transmission mount! The mount from NAPA was just a crappy as the other ones listed above. Lesson learned...ONLY USE OEM MOUNTS...especially the top and transmission.

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Old 01-07-2011, 09:26 PM   #8
LTond56
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Default Re: vibration after changing engine mounts

Just installed a non-frowny upper mount on a friends SL.
She wanted it done right away as the current frowny mount was totally collapsed and her windows and doors were buzzing like crazy.
I stopped in at Pep Boys and was surprised to find they were selling non-frowny versions that are OEM look alikes.

No vibration and very smooth.

Hope it lasts!

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Old 01-08-2011, 02:43 PM   #9
oakraiders24
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Default Re: vibration after changing engine mounts

The one I got from Autozone was also non-frowny, and seemed very solid in its make. After installing, night and day difference.

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