Hey everyone. Recently was replacing the engine shocks on my 300sdl. The strain from the new shocks actually doing there job unlike the old worn ones caused my engine shock mount rubber that was dry rotted to pull out and seperate completely from the mount. Was stunned by the 275 dollar per mount price tag. Finally got a suggestion from a fellow member (thank you diesel911) to use a pourable mouldable urethane resin called flexane or devcon. Looked into it more and decided on the flexane 80. There are different numbers with 94 being the highest and least flex down to something like 64 with a lot of flex. I bought the smallest kit available which was the flexane 80 pourable one pound kit. Cost about 65 dollars and have a ton left over. Here is the process i took. This mount looks like new and works exactly like a new almost 300 dollar mount. For $65 investment and that will fix both sides with tons of the kit left i am very happy.
1. Removed the engine shock mount from vehicle.
2. Cleaned all old rubber from the metal mount with knife, etc and bring down to metal with steel wool
3. Once down to bare metal and no rubber left i cleaned metal with degreaser and brake clean.
4. Used digital scales to measure out the mixture of resin and hardener. Ratio is 77-23 or about 4:1. I used only 1 ounce resin to about .25 ounce Jet for one side or 2 ounce to half ounce for both sides.
5. Mixed for around 3 minutes and pour the urethane into the metal mount.
6. Used a hair dryer on low to blow on the resin for about 10 minutes to bring all air pockets to surface and out of the mould.
7. Let it set for at least 24 hours. Recommends 2 days in box butt seemed well hard enough to drill. Says is at 80 percent cure in 48 hours with max cure coming at 7 days...however if u want to speed the process it says you can cure for one day then cure for another day at 150 degrees (i used a toaster oven) for another 24 hours to achieve a full cure
8. Used a drill press to drill hole for the shock to come thru the mount.
9. Installed back on mercedes.

This was a very simple process and with only 70 total in materials for 2 mounts versus the around $550 for both sides to buy the mounts i am more than pleased. This resin is actually made for this type use and works very well. I did some research and found people making engine mounts for 1000 horsepower cars, making old impossible to find rubber mounts, etc. I hope this helps some people out and maybe save some hard earned cash to put towards other maintenance on these lovely machines.