DIY motor mount rubber injection fail

IslandV70 · Post by **IslandV70** » 20 Aug 2019, 12:38

The stock top motor mount was too loose for my taste, so I bought one of the urethane mounts and installed that. The car drove great but vibrated too much

I bought a new stock mount and I was back to square 1, too loose but no vibration. I got the idea to fill the air spaces in the mount with silicone rubber. I bought some 2-part mix from Amazon and filled the mount with it. Now the car drives great but the vibration is about 90% as much as the urethane mount and the stock mount plus the rubber mix cost more than the urethane mount

I am sticking with it for now because I just hate sloppy mounts.

Post by **jimmy57** » 20 Aug 2019, 12:43

What issues did the standard mount cause? I question what the long term effects will be from a harder mount.

Katten · Post by **Katten** » 20 Aug 2019, 13:07

I filled my stock mount with glass sealer which was very soft, 15 shore I think. Still vibrated like crazy! Drilled lots of holes in it and tightend the mojnt with car in D if memory serves. Now it is ok but mojnt is not any stiffer then a new stock mount

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I believe the mount must be very loose/flexible to not get vibrarions in the cabin. I'd stick with stock, only filled mine because the rubber had split some on mine and was too cheap to buy a new one haha.

Post by **MoVolvos** » 20 Aug 2019, 19:27

Katten wrote: ↑20 Aug 2019, 13:07 I filled my stock mount with glass sealer which was very soft, 15 shore I think. Still vibrated like crazy! Drilled lots of holes in it and tightend the mojnt with car in D if memory serves. Now it is ok but mojnt is not any stiffer then a new stock mount .

I believe the mount must be very loose/flexible to not get vibrarions in the cabin. I'd stick with stock, only filled mine because the rubber had split some on mine and was too cheap to buy a new one haha.

I did the same thing except with roofing material. If the mount was new one could try just adding the rubber tubing without the sealer. I do notice a little more noise but not at idle. It was most likely from the strut tower mounts being solid now.
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viewtopic.php?f=1&t=89740&p=509540#p509540

Post by **ndphotonl** » 25 Aug 2019, 09:56

I have the round SuperPro insert and I can tell you it loses some of the harshness over time. Also, I pay less attention to it

Volvo S80 2.4T Removing the Upper Engine Mount OEM bushing by Andy Ramdin, on Flickr

Volvo S80 2.4T Polyurethane Upper Engine Mount vs OEM top view by Andy Ramdin, on Flickr

Volvo S80 2.4T Polyurethane Upper Engine Mount completed by Andy Ramdin, on Flickr

IslandV70 · Post by **IslandV70** » 25 Aug 2019, 12:52

The rubber is getting quieter now. I like how it drives enough to put up with it.

Post by **- Pete -** » 25 Aug 2019, 14:10

$23.15 for a new one that is every bit as good as the updated original.

I’ve been running one for ~20k miles. I’ve run the poly ones before, not to my liking and they eventually crumble into pieces.

https://rover.ebay.com/rover/0/0/0?mpre ... 2546755402