(Cont.)

I opted for the URO rear window seal. It was made of new rubber as opposed to an older OEM NOW rubber. You can see that the seals are nearly identical. When purchasing a seal, BE SURE TO SPECIFY 1st GEN or 2nd GEN trim for the seal, THEY ARE DIFFERENT.

I opted for a more secure water tight method and put a bead of 3M non-hardening Auto Bedding and Glazing compound, 08509, in the nook where the window and seal interface. The reason I chose this is that the corners actually collect water. It it is going to be sitting there this whole time, it will find a way down inside. This is why I believe there are so many failures. The FSM says to insert a bead after the seal and window are installed. However, this won’t get it deep into the groove, doing it before installing the seal was what I chose.

The URO seal is a good quality seal (see comparison to the older OEM seal that was pulled out). Unfortunately, it is missing some sharp bends near the bottom corners. Fortunately, the seal will still install, you will just need to have some green tape and some clamps to help keep it in place until the trim is fully installed. Use the string method to install the seal and trim. I spoke with URO and they apparently will make updates to add those corners.

With the seal and trim installed, I put a bead of 3M 08509 into the groove in which the frame opening channels will be fit in. The 3M product is what professionals use for other car glass installations. I highly recommend it.

Take the window assembly, place it in the bottom channel. This is where you check to see if it is centered where you want it. Once it is, start the process of pulling the string and easing the back glass in. I did myself, but a helper helps. The glass suction cup tools are very useful if doing it yourself.

Finally, the seal on the outside should be tucked in. If it is, use a plastic crevice tool to fold it out. I used more 3M 08509 to fill in the space under the flap seal. There is no water getting in now!

Reattach heater and clean up the 3M 08509 with Goo gone.

Enjoy your rear window!

*BTW - Impalaman on youtube released a video the same time I was working on mine for this process on his 300SD. I recommend viewing it as well. Good luck!

https://www.youtube.com/watch?v=x2Yt1ifjPPE

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Theseus

Instragram: doss_project
1984 300SD - 930 Blue, OM 617
Murfreesboro, TN

Theseus owned a ship in Greek mythology, and when a part of the ship needed replacing, it was replaced. Eventually, everything was replaced. Is it the same ship? (I own the car of Theseus. )

Hi Theseus, nice install! Yes indeed, we're going to add molded corners to Rear Window Seal 126 678 0120 / 1266780120 on our next production run, which should happen in about six to nine months.

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URO Parts online catalog: https://apaindustries.com/catalog

I have 2 85sd that I need to pull the rear glass and replace the seal. I wanted to know have done what’s stated above?
Thx greazer2b