C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

Engine Mounts

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Old Sep 27, 2022 | 08:41 PM
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Team,

I'd like to replace the engine mounts on my car and the transmission mount soon after.

Is there a write up somewhere on how to do this? What's the difficulty level?

Thanks96 CE
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Old Sep 27, 2022 | 11:01 PM
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I searched for you. I can only find vids for L98s fairly close to guide.
I should have documented my LT/s. Removal/ installs.
The LT motor mounts are much easier vs traditional clam shell style. And. less clearance is needed.
It's fairly tedious.

Last edited by THE 383 admiral; Oct 17, 2022 at 01:47 PM.
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Old Sep 28, 2022 | 06:22 AM
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Thanks. You found exactly what I found.

I can handle the job, I'm sure. It just sucks being on my back under a car supported by Jack stands.
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Old Sep 28, 2022 | 09:12 AM
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There is no transmission mount in the sense of an engine mount. The C-beam is the transmission mount, but it's a metal-to-metal interface with the transmission tailshaft: nothing to replace.
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Old Sep 28, 2022 | 09:13 AM
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No wonder I couldn't find a replacement part.
thanks a lot for the info.
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Old Oct 16, 2022 | 03:45 PM
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Team,

How critical are the protective blankets on the engine mounts? I know they mounts sit close to the manifold, but are the shields absolutely necessary?

Thanks

Last edited by rremesal; Oct 16, 2022 at 07:39 PM.
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Old Oct 17, 2022 | 04:53 AM
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Anyone?
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Old Oct 17, 2022 | 05:17 AM
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Originally Posted by rremesal
Anyone?
Without the blankets it will deteriorate the motor mounts quicker. How much is anyone's guess.
Now if you go to a polyurethane type bushing with no rubber then most manufacturers say that you can eliminate the blankets.
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Old Oct 17, 2022 | 05:25 AM
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Thanks for the feedback.

They sure are a pain to squeeze in with the mount.
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Old Oct 17, 2022 | 07:17 AM
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Originally Posted by grandspt
Without the blankets it will deteriorate the motor mounts quicker. How much is anyone's guess.
Now if you go to a polyurethane type bushing with no rubber then most manufacturers say that you can eliminate the blankets.
i did solid mounts that user Churchkey made for the forum a few yrs back

so no worries about anything deteriorating
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Old Oct 17, 2022 | 08:21 AM
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I don't think I'm ready for that level of hardcore-ness. In fact, in replacing the mounts hoping to eliminate some vibrations as the engine revs up.
the passenger side mount looked in great shape though. Not sure this is it, unless the driver side is totally shot.
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Old Oct 17, 2022 | 08:39 AM
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Originally Posted by rremesal
I don't think I'm ready for that level of hardcore-ness. In fact, in replacing the mounts hoping to eliminate some vibrations as the engine revs up.
the passenger side mount looked in great shape though. Not sure this is it, unless the driver side is totally shot.
If it's a vibration that peaks around 3000rpm, you may need to check your flywheel or flex plate to see if it has the proper balance for your engine.
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Old Oct 17, 2022 | 11:32 AM
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I have a ZF, and that whole clutch assembly needs attention. The clutch chatters like crazy. The vibrations are felt as RPM increases, under load or not.
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Old Oct 17, 2022 | 03:00 PM
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Originally Posted by rremesal
I have a ZF, and that whole clutch assembly needs attention. The clutch chatters like crazy. The vibrations are felt as RPM increases, under load or not.
Clutch chatter, "rollover" gear rattle, and RPM-dependent vibration are three different things. You have the latter of those three things. I'm willing to be you have a flywheel that has the wrong balance. Your engine probably still requires an external balance on the flywheel and someone put a neutral-balanced one on there. It's possible that it could be the other way around, though, if your engine was ever rebuilt and someone spent the time and effort to make it internally balanced.
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Old Oct 17, 2022 | 03:09 PM
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Trust me, I have terrible clutch chatter....especially in reverse going up the driveway into the garage. TERRIBLE!

I don't doubt though what you are saying about the flywheel.
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Old Oct 17, 2022 | 06:17 PM
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Originally Posted by rremesal
Team,

How critical are the protective blankets on the engine mounts? I know they mounts sit close to the manifold, but are the shields absolutely necessary?

Thanks

Reach out to these guys. They made some shields with their insulation.

https://www.koolmat.com
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Old Oct 17, 2022 | 08:42 PM
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All,

I had a hell of a time trying to get the driver side mount in. I struggled for about 2 hours. I finally realized I had the mount facing the wrong way (180*).
Noticed in the picture below how the top of the mount where the bolt goes through, there is a groove that mates with a notch on the engine mount bracket. If you have it backwards, the mount will never slide in to place.

The passenger side took me about a minute yesterday. However, notice how the passenger side sits a bit offset on the base. Is this what you all have seen as well?


Notice the groove where the bolt goes through.

Passenger side

Driver side... It sits more centered than passenger side. 😐
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