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Old 07-10-2009, 11:56 PM   #1
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Unhappy Motor mounts...WHAT THE.....!?!?

First off, what'* wrong with the pictures below?





Well, when I bought the car a few weeks ago, I didn't realize that wasn't the stock front motor mount. I inspected the car as best I could before I bought it, but not being familiar with the Bonneville'* before buying I just didn't know what to look for besides the usual stuff. I could tell something was amiss because this mount has had black polyurathane sqirted into it for additional support. I though it must have been getting weak or something. I realized after I bought the car that the EBCM was not permanantly mounted and was sitting an inch or so from the mounting holes. That'* when I put 2 & 2 together and realized that mount wasn't stock. At least not on the bonneville. I'm sure it was pulled off another 3.8 somewhere since it matches the holes. I confirmed that it wasn't stock when I got my service manaul.

So today I'm doing further inspections on the car cause I know there are some bugs that need to be straightened out and I want to know what else needs to be added to the list. I pulled the drivers side tire and found that the back motor mount (right trans mount according to the service manual) is not even attached. There is one bolt on the lower of the three holes that has busted out the side of the mounting hole and stripped out all at the same time. The bolt was still there but barely. The other two bolts are completely missing. I figured they were stripped out too but can't really tell, so off to the store I go the get replacement bolts. I get back and guess what, the top outside hole is stripped out and the top inside hole still has the bolt shaft in it (head busted off). I'm not a happy camper at this point.

So, how important is the rear motor mount on this car? I'm thinking the front mount was ugraded at some point to accomidate for the missing rear mount. The car runs smooth with minimal vibration (which sound normal according to many of the post I've read). The only thing that bothers me is what happens if the front mount gives way? And I'm sure there is extra movement in the motor too without the rear mount. I am open to so any suggestions at this point. Replacing the tranny is not an option. I see the tranny was replaced before from the GM sticker on the side of the tanny, which makes me wonder if someone forgot to tighten the bolts good?

I'm a bit pissed, but beyond this, I love the car. I'll keep driving it no matter what for now!
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Old 07-11-2009, 12:50 PM   #2
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First off you need all your motor mounts to keep your drive train aligned. Bad things happen if you engine moves around too much. Broken CV joints, stress on the exhaust ect. IF you don't add a new rear mount the front mount is going to wear away real fast. See you have a superchager too you engine is probably twisted alot on launches. Looking at where the holes are not an easy just drill, extract, and tap situation. I'd ask the former owner what all this is about and what shop got it down cause it'* really done wrong and should be fixed. To but the back mount on the trans will probably have to be removed to repair the holes. But going around especially with a car with kick on only 3 mounts is a bad idea.
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Old 07-11-2009, 07:16 PM   #3
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Hold it.....if you have a 2000+ BONNEVILLE that is NOT the OEMmount that came with the car
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Old 07-11-2009, 10:00 PM   #4
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I know that'* not the OEM mount, now, but I didn't know that when I bought the car. I'm thinking that when the back one give way, it must have broke the front one, hince the new mount. It seems like a good strong mount and so far is holding good, but if it gives way, I'm in trouble and I know this. I'm trying to figure out if I can drill and tap the holes on the back one size larger without any major dismantleing or removal of the transmission.

I wonder if I removed the front mount, gutted it, and put in some cut up tires to stiffen things up and reduce movement if that might help in the mean time? Everything is good now, but I don't need anything to happen before repairs can be made. I'm open to any suggestions on how to drill the new holes.
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Old 07-11-2009, 10:27 PM   #5
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Why not hit a Bone Yard and buy 2 used mounts and just swap them out for the used ones you just bought? That way they would be original right? Well best of luck to you on what ever way you decide on fixing the problem.
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Old 07-11-2009, 11:16 PM   #6
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I wish it were that easy, the holes on the transmission for the mount is stripped out and one bolt is broke off :(
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Old 07-11-2009, 11:22 PM   #7
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Why not use an easyout and remove the bolt that is broken? Then you could try to use quick silver liquid metal and fill in the stripped holes and then drill new holes into the holes filled in quick silver to bolt your new mount to. Just and idea? Well good luck and let us know what happens.
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Old 07-12-2009, 05:45 PM   #8
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So where do I get this "quick silver" from? I googled it and nothing comes up. I'm willing to try anything at this point.
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Old 07-12-2009, 09:48 PM   #9
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At your local Wal Mart in the auto section comes in a black and silver package and cost 5.00 it looks all bright and shinny says quick silver all around the tube it is about an 1 inch round and 5 inches long hanging inside a piece of cardboard, it works real well so check it out and good luck with it. Read directions it sets up fast and hardens over night.
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Old 07-12-2009, 09:52 PM   #10
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not going to lie. That stuff is good when you need to fix something in the house or such. We are talking about something that holds the torque of your engine. Yes I know it may suck, but if you want your car to last it helps to doing them the right and true way.
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