Filling Worn Mounts with Urethane?

[Scotty]

What are your views on packing your old/worn engine mounts with urethane or any other material good for the job? Is it worth it? Expected lifespan?
What method did you use: baking or leaving it to air dry for days?

[potge]

I had the same questions or more precise seek for experiences, cause seems like a trend lately. I searched a bit and saw multiple versions of the material used from liquid urethane with hardener, to sealing pu based and glass sealing. Sure all of them share some common base but i doubt that all the materials have the correct mechanical properties in stress etc. I dont doubt that there are equivalent or better materials to be used, though i am confused of which is the correct. So provided the correct material is found (ie same or better in stress etc) you can have a very good mount or even better. As for the method its described precisely on the manual of the substance so no alternatives and no worries.

[Jay]

Good topic.

I used VW windscreen bonder for the ones on my trackcar but I think I rushed the application without letting each layer dry out properly. It's flaking now.

What did everyone else use?

[potge]

Good topic.

I used VW windscreen bonder for the ones on my trackcar but I think I rushed the application without letting each layer dry out properly. It's flaking now.

What did everyone else use?

I have come up to this so far:
Forsch urethane (http://www.forschpolymer.com/UrethaneSystems.html), 3M windscreen bonder and another one i dont currently remember (but remember was a bit on the soft-filmsy side)

[ivan]

Mine started to seperate (unbond from the original mount). Then again i did not clean my mount all that well either.

I think i might cover my original mount rubber with superglue first because then the urethane will actually have something to grab onto.

ivan

[jezza323]

i got mine done professionally at a bonders

they burnt out the existing rubber, then poured in fresh 80 durometer poly, cost is $80AU/mount and takes about 1 week from the drop off to pick up

[potge]

i got mine done professionally at a bonders

they burnt out the existing rubber, then poured in fresh 80 durometer poly, cost is $80AU/mount and takes about 1 week from the drop off to pick up

Now that you mentioned the magic word durometer. Does anyone know the durometer of the oem bushes? or maybe jezza they measured yours before filling new?

@ivan most of these polymers have extensive manual where the clarify whether the are suitable for using at several materials. Adding superglue might not improve grip or might not be compatible. I would bet on cleaning it well and leaving the metal a bit rough for some extra grip or using a primer made from tha same company or equivalent.

[ivan]

yeah, was a stab in the dark.

The prob is i had an 80% durometer rear mount and it vibrated the whole car. Its just too noisy for me. I wanted something that was more absorbant.

Jezza, have you done this yet? how does it perform? whats the number so i can send mine off this week?

Thanks

[jezza323]

yes ive done it, havent swapped the rear mount yet, just the front 2

it is very vibratey, and i wouldnt recommend it to most people :) however they do also do it in various hardnesses of rubber (not sure if they can do them non solid though - like stock with the holes to allow some movement) - harry (josh) with the 5e powered EP71 up here had his done in rubber, havent asked him how it is though.

the place is called QLD Rollers & Liners and its just down the road from me in Rocklea, but you will probably be able to find a similar business close to you ivan

[ivan]

im going to do a bit more reasearch and try out a more "home job" solution, one thats more suitable for the average starlet owner.

I will keep you guys informed :)

Ivan

[jezza323]

have a search on TercelOnline, a few of them have poured their own poly mounts, and others have filled std mounts.

[ivan]

link me baby :)

[Scotty]

Thanks for the reply guys. I've decided to attempt to get my gearbox mount packed with 3M urethane as an experiment by my mechanic. I wanted to do the right engine mount (by the timing belt) but apparently the bolt hole isn't accurate because the rubber has deteriorated.
I don't think I'll be doing the rear mount in fear of it being too harsh in the cabin -- I don't think the girls will like that at all...

I should be going to the garage on Saturday. I'll tell you all how it goes and attempt to take some pics as well.
Thanks again everyone.

[Scotty]

Went to the garage yesterday and the guys suggest I wait another week to ensure the urethane has properly cured. We won't be baking it like the US DIYers as I've seen persons do it and within a couple of months the urethane breaks up.

[jezza323]

just let me say, i have only swapped the 2 front mounts with poly so far, and the vibration is pretty crazy....i wouldnt recommend it for most ppl. i can only see it getting worse when i get around to doing the rear mount

[Scotty]

Well, I got the mounts put in today. Just the right (by timing belt) and left (gearbox) mounts which have been urethaned are in. I'm using a new genuine rear mount. So far, I've had no problems/excessive vibration -- maybe I'm accustomed to the vibration from the worn right mount...which was dead as dead can be.
You know the centre piece for the bolt to go through...yeah...I took that out with my hand and watched the rubber around it drop out of the mount casing. Woo.. .. ..