DIY polyurethane transmission mount - Hyundai Genesis Forum
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post #1 of 81 Old 12-04-2011, 05:37 PM Thread Starter
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DIY polyurethane transmission mount

I'm sure most of us are aware of the drive-line lash is one of the weakness/annoying issue of our Gencoupe. The tofu soft engine mount, transmission mount, soft driveshaft crush drives, as well as differential mount all need some reinforcement.

Currently, CP-e makes a good polyurethane engine mount set that eliminate lots of necessary engine rocking movment; ThrowDown sells the Torque Solution differential bushing kit as well that fills up the "missing" diff mount on the subframe; I figure, those 2 items mentioned above probably cure the below par Hyundai driveline, but I decided there could be one item left to be improve.

Take a look at this video, this is how our manual transmission mount looks like, a big void in the middle and it's very soft. Good for NVH, but it doesn't seem to support the tail end of the transmission very well.

This is basically what I did, raise up the car, makes sure it's secure. Support the transimission, if you work on the floor, just put a floor jack underneath it and pickup the tranny a little bit, just to unload the tranny cross member.
Total 8 fasteners, four main bolts, two smaller bolts and 2 hex nuts.

Take it out, clean it thoroughly with brake cleaner, and this is what you will need. 3M window urethane, part number 08609, it's about $19 from most autopart store. Working area, ductape, and caulk gun.


According to 3M MSDS, once the urethane cure, it will have durometer of 60shore, pretty stiff, but not quiet hardcore like the 90shore+ race engine mount, so it shouldn't transmit a lot of unwanted vibration.

clean up the mount very well, and tape off one end, so urethane won't flow out.


Take your time and slowly squeeze/pour the urethane into the void of the mount, try not to trap air bubble in there. Once it's full, spread it with some old plastic card and make it look nice.



The instruction said gives around 24 hours to cure in room temperature (60+F), but I guess I packed almost over half a tube into this mount, with limited surface area, it didn't really dry until 72 hours, so plan accordingly.

I didn't take any video after it cued, I was ready to use the car and tired of riding the motorcycle in the cold. But the damn thing stiffen up a lot, and it transit more feedback in between shift once the clutch is engage.

For $19 it's not bad at all, it was kinda fun. Just to remind you the weakest link is still the engine mount, by doing this mod alone will not cure the excessive engine rocking movement. But since no one makes aftermarket tranny mount, it is probably a good idea to make one yourself.

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Last edited by gunluvS14; 12-04-2011 at 05:43 PM.
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post #2 of 81 Old 12-04-2011, 08:50 PM
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That's what's up ....i did the same with the factory diff mount .....

R-Spec 2.0T ..... With Everything CP-E Has To Offer. Cp-e Turbo Back Exhaust . Cp-e Front Mount . Cp-e Motor mounts. Cp-e diff mounts. Haltech Etc................
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post #3 of 81 Old 12-05-2011, 04:46 AM
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subscribing. I like this idea.
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post #4 of 81 Old 12-05-2011, 07:24 AM
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I know on a lot of other boards they use this same method to do their engine mounts. Not sure if its possible with ours, I havent looked at them. But on Hondas, they have a flooting bushing with a bolt holding the motor. So filling the gaps makes it close to a solid motor mount.

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post #5 of 81 Old 12-05-2011, 08:23 AM
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I did this on my last car. Still got a tube around. I wanted to do this to the rear dif bushing.

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post #6 of 81 Old 12-05-2011, 10:02 PM
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Thanks for the write up. If you check mcmaster carr, you can choose your hardness; the higher the durometer, the stiffer it is.

Sent from my Nexus One using AutoGuide App
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post #7 of 81 Old 12-06-2011, 06:01 AM
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Originally Posted by ZakRabbit View Post
Thanks for the write up. If you check mcmaster carr, you can choose your hardness; the higher the durometer, the stiffer it is.

Sent from my Nexus One using AutoGuide App
would u have the link to this i found the site but couldn't find the product.

I am not a list of mods but what i know and share:
http://www.gencoupe.com/2-0t/94778-fuel-system-what-you-need-know.html
http://www.gencoupe.com/2-0t/86146-wastegate-101-a.html
http://www.gencoupe.com/2-0t/91199-compressor-maps-how-read-them.html

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post #8 of 81 Old 12-06-2011, 06:09 AM
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I got my urethane from NAPA. It is used as body panel adhesive.

2010 Red 2.0L track

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Last edited by Red Raspberry; 12-06-2011 at 06:26 AM.
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post #9 of 81 Old 12-06-2011, 06:29 AM
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Quote:
Originally Posted by ZakRabbit View Post
Thanks for the write up. If you check mcmaster carr, you can choose your hardness; the higher the durometer, the stiffer it is.

Sent from my Nexus One using AutoGuide App
i found it and wow.... the HARDEST is 75D.... thats as dense as a hard hat... is there any reason why that could be TOO hard?

I found another company that makes 80D Urethane and 90D(i'm not sure but it isn't urethane)

acutaly if you look they even sell a 83D urethane or a 86 epoxy
the 3M used in OP is 60shore... 65D is about double the hardness 80D is even more.... i'm just wondering if any bad could come of this.

I am not a list of mods but what i know and share:
http://www.gencoupe.com/2-0t/94778-fuel-system-what-you-need-know.html
http://www.gencoupe.com/2-0t/86146-wastegate-101-a.html
http://www.gencoupe.com/2-0t/91199-compressor-maps-how-read-them.html

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Last edited by cris90; 12-06-2011 at 06:48 AM. Reason: MORE
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post #10 of 81 Old 12-06-2011, 06:52 AM
3.5L TT but wrong body
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Good stuff. Was thinking about doing that a while back butnever got around to it. Did the same thing to the motor mounts in my old Integra after they started cracking a bit.

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post #11 of 81 Old 12-06-2011, 07:43 AM
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Does anybody make inserts? Ive done this on my old car, works pretty well.
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post #12 of 81 Old 12-15-2011, 07:55 AM
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Awesome post! I think I'll give this a go on a sunday. I don't really drive my car during the week anymore. Although I'm not a huge fan of making irreversible mods to the car.

Maybe line the piece with wax paper or something to make an insert out of it. I suppose if I hate it I can swap with someone who wont though.
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post #13 of 81 Old 02-08-2012, 04:46 AM
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does anyone know where i can get a used trans. mount? i can't affford the down time so i figure i can buy a used mount do the "dyi" then replace it with mine and sell my trans mount to someone else who wants to do this.

I am not a list of mods but what i know and share:
http://www.gencoupe.com/2-0t/94778-fuel-system-what-you-need-know.html
http://www.gencoupe.com/2-0t/86146-wastegate-101-a.html
http://www.gencoupe.com/2-0t/91199-compressor-maps-how-read-them.html

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post #14 of 81 Old 02-08-2012, 05:32 AM
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Here's a couple of links for used car parts.

Copart USA - The Source for Online Car Auctions - Home Page

Car-Part.com--Used Auto Parts Market

2010 Red 2.0L track

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post #15 of 81 Old 02-08-2012, 05:45 AM
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^ ya i've check a few of those sites but they don't have on the site. I left a message for them describing what i want but i haven't heard back from them.

I am not a list of mods but what i know and share:
http://www.gencoupe.com/2-0t/94778-fuel-system-what-you-need-know.html
http://www.gencoupe.com/2-0t/86146-wastegate-101-a.html
http://www.gencoupe.com/2-0t/91199-compressor-maps-how-read-them.html

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post #16 of 81 Old 02-08-2012, 06:02 AM
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Quote:
Originally Posted by cris90 View Post
does anyone know where i can get a used trans. mount? i can't affford the down time so i figure i can buy a used mount do the "dyi" then replace it with mine and sell my trans mount to someone else who wants to do this.
This can be done in an afternoon, there should be no appreciable downtime. Urethane will set to being usable in about an hour if mixed right.

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post #17 of 81 Old 02-08-2012, 06:13 AM
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OP says because of the extensive usage it took 72hurs to dry... that's friday night and reinstalling Sunday later afternoon at best lol

I am not a list of mods but what i know and share:
http://www.gencoupe.com/2-0t/94778-fuel-system-what-you-need-know.html
http://www.gencoupe.com/2-0t/86146-wastegate-101-a.html
http://www.gencoupe.com/2-0t/91199-compressor-maps-how-read-them.html

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post #18 of 81 Old 02-08-2012, 06:19 AM
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OP says because of the extensive usage it took 72hurs to dry... that's friday night and reinstalling Sunday later afternoon at best lol
Check out the stuff available from mcmaster-Carr. I used to pour suspension bushings, I don't know how different that stuff is, but we used to get full hardness within an hour.

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post #19 of 81 Old 02-22-2012, 02:11 PM
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Awesome... just what i was looking for
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post #20 of 81 Old 02-22-2012, 02:28 PM
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and for the hardcore guys .. you can also do it with epoxy!
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