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2000-2005 Discuss your 2000-2005 Bonneville SE, SLE, and SSEi Please use General Chat for non-mechanical issues, and Performance and Brainstorming for improvements.

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Old 02-03-2003, 01:43 AM   #1
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Default MOTOR MOUNTS

Can't find heavy duty or polyurethane mounts for my 2000 SSEI. Do I need to have them custom made? This is our first Pontiac, I noticed the Gran Prix'* have upper mounts and the Bonne'* don't. Would fabricated upper motor mounts harm anything on my Bonne? The motor has a lot of movement forward and aft now.
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Old 02-03-2003, 01:49 AM   #2
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That sounds like a good question for Hector or Ty. I'm not aware of any aftermarket offerings in the engine mounts, but it'* possible there is. All H bodies use the same mount.

I'd be really hesitant to add upper mounts to this beast. I know how much mine torques now. I'd be afraid of folding over the front end of the car!
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Old 02-03-2003, 03:04 AM   #3
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Since were on this subject, how do you know if your motor mounts are bad, will the car shake any, cause my friend who is a mech. says that he can feel it thru the steering wheel. He says it probaly needs to be replaced.
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Old 02-03-2003, 03:12 AM   #4
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If he knows his ****, yes he can feel it. It'* not easy to tell unless you've experienced it yourself before. These mounts don't typically go bad, but I've heard of a couple breaking. Not common.

I'd be curious to hear exactly WHAT about the mounts is going south. I can also get you part numbers for the stock OEM mounts and prices for them if you're interested. I just need the year and model of your car.
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Old 02-03-2003, 04:11 AM   #5
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If the motor mounts are not soild, (starting to get soft) it will shake the steering wheel first. When motor mounts crack and become loose, it will shake the entire car, you will feel it for sure. You can't miss it.

I think I can answer for both Ty and myself. There is no point in having polyurethane motor mounts for our cars. Where they are placed they hold down the torque to the wheels good enough. The best options is just to replace it with newer OEM ones. The Grand Prix one'* are just kind of there basically. They really dont do much. It'* basically if you have everything for your car and want to do something, add some polyurethane motor mounts. Basically it'* not worth out time and Ty and myself are about performance more than useless products.
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Old 02-03-2003, 03:27 PM   #6
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So how would you know when it'* a motor mount from the shakin ? to lets say an off balance tire or something ? Or does it shake when you rev the engine while in park ?? I'm just curious to know as so I know what to look for if mine ever goes.
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Old 02-03-2003, 10:15 PM   #7
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If a motor mount is bad, it shakes your entire car. The purpose of the motor mount is to mount the motor as well as absorb the vibration of the engine at idle.
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Old 02-04-2003, 01:39 AM   #8
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Default MOTOR MOUNTS

One motor mount on the front of engine which is 7 inches from center towards the drivers side. Motor mount is not cracked, or torn, it is dry (no oil, solvent) nothing to weaken it. However, the motor torques so much it actually straightens out the top raditor hose. I have never seen so much movement except on something with broken motor mounts. With this movement I can not have a CAI unless I keep the stock accordion boot which is not good for lineal air flow. It might be time to mill and drill, a piece of bar stock the appropriate height to take the place of the rubber mount i.e. solid motor mount up front. If the motor torques back into the fire wall, it will be expensive to replace all the pluming.
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Old 02-04-2003, 01:50 AM   #9
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That sounds a bit severe. Have you inspected the other mounts? Sounds like another mount is shot, causing that one to rev over. I may have to play around with mine and see how much motion I get. We need to use an identical measuring point. Since we're talking about top engine movement, take off your SC cover and measure from the hood latch to the center of the SC. See how much motion you get, and I'll do the same with mine.
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Old 02-04-2003, 09:15 AM   #10
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Quote:
Originally Posted by willwren
If he knows his ****, yes he can feel it. It'* not easy to tell unless you've experienced it yourself before. These mounts don't typically go bad, but I've heard of a couple breaking. Not common.

I'd be curious to hear exactly WHAT about the mounts is going south. I can also get you part numbers for the stock OEM mounts and prices for them if you're interested. I just need the year and model of your car.
Motor & Trans mounts CAN GO BAD, WILL! Oil leaking onto them will destroy the rubber bushing inside it! Also, if any front damage has been done, then that mount can either break or now wear in a different spot due the frame shift!
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