DIY Polyurethane mounts!!!

God Bless the Black Top* · Posted: Mon Nov 14, 2005 3:49 pm Post subject: DIY Polyurethane mounts!!!

hey guys,

i keep busting my rear engine mount (transmission mount) and thought it was time to polyurethane the beyotch.

hope this will come as some help to noobs like me.
you can get polyurethane at laughlin and de gannes for $52 a tube (3M),
or at matura auto supplies in st. james (got this info from ninja boost).
i would've prefered the mixture, as packing the polyurethane in was hard as ass without a gun.

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<b> step 1 : wash the mount rubber with some soft detergent (i.e. squeezy), to get all the dirt, dust and grime that would cause unsticking.

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step 2 : After i left it to dry, i used a blow dryer to get out any left over wet spots.

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step 3 : I used a rough edged drill bit to make the side walls and rubber bits course so that the polyurethane will adhese better. you can also use heavy sandpaper, so a drill isn't necessary.

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step 4 : After using the drill (or sandpaper whatever you choose) to get out all those loose bits of rubber and roughen the inside, it looked like this.

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step 5 : Cut out round shapes from the cardboard to cover the ends of the mount. i layered it with scotch tape (use parcel tape, much much easier) so that it wouldn't stick to the polyurethane when i pull it off.

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figure 1. it should look something like this when you're done

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figure 2. different angle

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step 6 : i didn't get a shot in after i packed it polyurethane, cos my hands were covered in it, so i have some reference shots here, of the mixture after being poured in the mount as well as how you should use the cardboard.

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step 7 : after packing the mount, seal both sides and leave to dry for a minimum of 24 hours. this is what mine looked like. i would recommend using the duct tape instead, as it holds better and makes easier clean up.

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figure 3.

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don't forget to wear gloves or something for better clean up, this sheit is not coming off anytime soon.

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FINISHED!! now go and drink a beer, you've wasted too much time on your car!

Polydor · Posted: Mon Nov 14, 2005 5:20 pm Post subject:

Great except use card board to make initial pattern

then heat in oven for 25-35 mins.....@ 275-350 F

scrape off original rubber.......

NOW USING TEMPLATE.....apply the 3M to the mount followin procedure above..

let dry and TADA........

Polydor Cool

ninjaboost · Posted: Mon Nov 14, 2005 6:49 pm Post subject:

...boy your hands go be dutty for some days to come... Laughing

...you should have done the other mounts one time jed, gearbox mount is the second weakest...
...yuh cudda also ask me fuh a gun borrow...

...make sure yuh give it enough time to dry also... as the outer parts may seem dry while the inside wet like the drag strip on Sunday... Rolling Eyes

ZORT · Posted: Mon Nov 14, 2005 9:19 pm Post subject:

What was the name of the 3m product? 3m window weld?

God Bless the Black Top* · Posted: Mon Nov 14, 2005 10:55 pm Post subject:

cdx2k1 · Posted: Mon Nov 14, 2005 11:55 pm Post subject:

U can get some cheap disposable gloves for a buck in a pharmacy Mr. Green

What advantages to polyurethane mounts/bushings have over stock ones?

bleedingfreak · Posted: Tue Nov 15, 2005 7:31 am Post subject:

^^^ Think Rotoplastic water tank material as opposed to rubber.

Lasts longer... but more squeaking... right?

BLUE_CP9A · Posted: Tue Nov 15, 2005 8:23 am Post subject:

How bout a sticky for this excellent post

bleedingfreak · Posted: Tue Nov 15, 2005 8:28 am Post subject:

Agreed... a really good post there fella Smile

Good pics, good instructions!

Rudman · Posted: Tue Nov 15, 2005 8:50 am Post subject:

Great post GBTBT, I herd of people doing this but was confused by what they meant when they said that they using the 3M product.

So I guess U will end up with a solid mount with this procedure.

Polydor · Posted: Tue Nov 15, 2005 9:10 am Post subject:

Sorry for the late response....

You are heating the old mount just to make taking off the original rubber a little easier......

As for the cardboard it was for the little space for some flexing .....but it's up to the DIYer ....if you are ok with the vibration.....I say full that sucker totally....but if you're looking for some more comfort then some space for flexing is necessary.....it does not have to be exact but use, say a soda plastic bottle masked to form a small oval shape.....apply the 3M as before ....and TADA.....

My mistake for not fullly explaining...
Polydor. Cool

ninjaboost · Posted: Tue Nov 15, 2005 9:24 am Post subject:

3M makes two polyurethane based products with very similar properties that I have seen people use with the same results....
Auto Glass Windshield Urethane and Window Weld

...my advice is to fill it completely as I have done ....the vibration is not even noticable on my application...

Dave · Posted: Tue Nov 15, 2005 9:32 am Post subject:

i have done this am still would not make a mount back from scratch with this
i would get a fairly good mount and fill the spaces ensuring that all the air bubbles are gotten out cause mount would not firm up
i used the window weld but is kinda scarce down here but the window sealant works equally well just not as rigid
keroscene and gas really helps in getting it off your hands Laughing

Rudman · Posted: Tue Nov 15, 2005 9:36 am Post subject:

Thanks Polydor. O.K, so the million dollar question...... how durable are mounts made this way?

Rudman · Posted: Tue Nov 15, 2005 9:42 am Post subject:

solo · Posted: Tue Nov 15, 2005 9:43 am Post subject:

very good thread fellas...

Dave · Posted: Tue Nov 15, 2005 9:47 am Post subject:

Slayer · Posted: Tue Nov 15, 2005 11:13 am Post subject:

i filled the spaces in all my mounts with the 3M windshield urethane about a year and a half ago for 2 reasons, to decrease engine movement and to extend the life of the mounts.

i'm pleased with the results so far, the increase in vibration felt or heard inside the car is negligible. good cheap mod.

i was advised that i should do all the mounts, packing only one with polyurethane will transfer more stress to the unpacked mounts, don't know if that's true but i did all anyway. one tube did all easily.

TriniGT · Posted: Tue Nov 15, 2005 12:13 pm Post subject:

Good job man, keep it up. Someone sticky this.

bleedingfreak · Posted: Tue Nov 15, 2005 3:53 pm Post subject:

As much as it sounds great, I am seeing Dave's point on this... but i think it's just like any other DIY modification that you put in your car - it's a chance you're taking and trusting yourself to do it right...

To each his own Cool

assassin · Posted: Tue Nov 15, 2005 9:53 pm Post subject:

great info here Cool

solo · Posted: Wed Nov 16, 2005 6:23 am Post subject:

zodiaque · Posted: Wed Nov 16, 2005 11:52 am Post subject:

Nice project there! Is this strong enough for suspension application too? or is it too weak?

Cleriq · Posted: Sat Dec 03, 2005 1:10 am Post subject:

Oh great, my tranny mount buss on me too yes. And I was goin and order the Mount kit $300.00 US plus Shocked

halfbreed · Posted: Sun Apr 30, 2006 6:06 pm Post subject:

bump for a good thread.

i thinkin of using this on my stabiliser link bars.

how effective is this on suspension parts?

Rx · Posted: Sun Apr 30, 2006 6:54 pm Post subject:

great thread !!!!

excellent work with the pics and explanation Smile

TurboDrive · Posted: Sun Apr 30, 2006 7:10 pm Post subject:

Would the vibration be as bad as a solid mount that you get from sasco rethreads ?

MG Man · Posted: Mon May 01, 2006 9:29 am Post subject:

how does the 3M material stand up to heat? as in if the mount will be surrounded by the primaries of a race tuned stainless steel manifold?

pioneer · Posted: Sun Nov 05, 2006 12:50 pm Post subject:

thanks ppl...so you have to dig/pull/cut/drill the original rubber out from the mount ?

can this be done to worn/busted mounts ?

venum · Posted: Sun Nov 05, 2006 1:35 pm Post subject:

Good Info, great post Nick

how bout this

with aftermarket mounts, how about filling some of teh space with the polyurethane and leaving some space to allow flex

this would result in a strenghtened mount that still allows some flex

after all the manufacturer designed the engine to flex onteh mount to reduct vibration for a reason