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I own a 2000 FRC with 221,000 miles, daily driver. I replaced the motor mounts last month. The car was noticeably smoother and quieter just idling. The car is much quieter at all driving speeds. Wish I had done this sooner. I have owned the car 10 years and am guessing the mounts were not replaced by the previous owner. After removing the passenger side mount, a close inspection revealed nothing unusual; there was no sign of leakage or failure. It was difficult to distinguish the new mount from the old mount as they sat side by side. It took a closer inspection to reveal the new mount was approximately 1/4 inch taller than the old mount. Inspecting the driver's side mount showed the same results. Clearance between the oil pan and cross member was something I always marveled at working on the car as there could not have been more than 1/8 inch clearance between the two. The new motor mounts increased this gap noticeably. Driving pleasure is way up now. I was reluctant to do this job as the engine did not rock very much, the mounts looked fine and there was no sign of damage or leakage.
I own a 2000 FRC with 221,000 miles, daily driver. I replaced the motor mounts last month. The car was noticeably smoother and quieter just idling. The car is much quieter at all driving speeds. Wish I had done this sooner. I have owned the car 10 years and am guessing the mounts were not replaced by the previous owner. After removing the passenger side mount, a close inspection revealed nothing unusual; there was no sign of leakage or failure. It was difficult to distinguish the new mount from the old mount as they sat side by side. It took a closer inspection to reveal the new mount was approximately 1/4 inch taller than the old mount. Inspecting the driver's side mount showed the same results. Clearance between the oil pan and cross member was something I always marveled at working on the car as there could not have been more than 1/8 inch clearance between the two. The new motor mounts increased this gap noticeably. Driving pleasure is way up now. I was reluctant to do this job as the engine did not rock very much, the mounts looked fine and there was no sign of damage or leakage.
Thanks for sharing! I have new stock-style mounts on the shelf waiting to go in, and need motivation (such as your success story) to install them. Mine only have 70k (or less) miles. Recently I swapped out the diff mount for a Hinson so a full set of new mounts sounds nice.
So far... I think it's okay. I haven't really done a full "normal" drive yet, where the full interior is back together (to cancel out road noise, so I can isolate noise from diff mount NVH). Also I forgot to plug in my HVAC unit when I put the center console back together so I needed my windows down while commuting today. Once all that is done I'll have a better idea of NVH at highway speeds.
I removed the mounts attached to the brackets. The right side (passenger) is easy. The driver's side mount is a pain. There is simply not enough room to remove the mount from the bracket or remove both together without unbolting a few things. Not difficult but time consuming. My trouble shooting learning curve stopped around 1990. It is probably true of any car made after 1998 but I find almost nothing about the C5 Corvette that allows for intuitive analysis of many, many issues. Aside from that, it seems to take many times longer to replace parts than on earlier cars. Case in point: the clutch. Another example: A/C compressor. What a load of unnecessary labor (feel free to substitute your own noun for the word "labor"). I have many interests but cars and airplanes are at the top of the list. On the plus side, the car outperforms most of the cars I have owned when it comes to acceleration, handling and mpg. With the exception of grounding bolts and some fasteners, nothing rusts. Pretty cool. It is a shame it takes so much time to fix things. Unless I win the lottery, no more Corvettes of any year.
I removed the mounts attached to the brackets. The right side (passenger) is easy. The driver's side mount is a pain. There is simply not enough room to remove the mount from the bracket or remove both together without unbolting a few things. Not difficult but time consuming. My trouble shooting learning curve stopped around 1990. It is probably true of any car made after 1998 but I find almost nothing about the C5 Corvette that allows for intuitive analysis of many, many issues. Aside from that, it seems to take many times longer to replace parts than on earlier cars. Case in point: the clutch. Another example: A/C compressor. What a load of unnecessary labor (feel free to substitute your own noun for the word "labor"). I have many interests but cars and airplanes are at the top of the list. On the plus side, the car outperforms most of the cars I have owned when it comes to acceleration, handling and mpg. With the exception of grounding bolts and some fasteners, nothing rusts. Pretty cool. It is a shame it takes so much time to fix things. Unless I win the lottery, no more Corvettes of any year.
Yeah I've found it can be troublesome also but for me I'd still rather have it cause a few things can still be done by people in their garage compared to the computers on wheels of current vehicles. Heck just look at the engine bay of a new super duty ford. Basically have to disassemble the entire thing to do the smallest job hence having to go to the dealer.
When I had my front cradle off earlier this month, one of the things I did was replace the motor mounts. In the photo below the one on the left is the used factory stock 79K mile driver side mount that failed (notice the crack near the top) that had compressed down to 2.8" high (may have been even shorter under load), middle is a new stock GM replacement mount that came with the car from the PO which is 2.9" high and on the right is my foil wrapped Hinson poly mount that is 3/8" shorter than stock, with four (4) 1/16" thick, 3" OD x 1/2" ID stainless fender washers, that nets out at 2.7" high. New motor mounts, factory stock liquid filled or even aftermarket poly ones make a big different, when replacing failed factory mounts.
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New motor mounts: big improvement
