Originally Posted by 87tdwagen

Anywho To those W124 wagon owners who will likely encounter rear side window rust in the future, this is a follow up to wrap up details from my experience in the hope that they are useful to others.

Maybe this belongs in the Tech Help Section as there are many more gasser wagons than diesels. Moderator please feel free to move as appropriate.

Some picture below will show my progress from welding in the patches, finishing and back to like it never even happened.

To Answer my own question about the non-hardening glaze. It's a MUST. I hate to say this, but MB's design for this window seal is pretty poor, actually very bad, having only 3 objectives as a seal to seal the body from moisture entry, to seal the window from moisture entry and to well, hold the window.

The MB seal does 1 of these really well...hold the window, moisture entry....not so much, even the FSM details the need of glazing in both the body to seal surface and the seal to glass surface, which leads one to ask, what the heck does the pliable rubber seal do??? Oh yeah, hold in the glass.

The seal itself is easy to install and from both the FSM and my experience needs to be fitted to the body before installing the glass. Fitting the glass requires some fidgeting to shift the glass to the lower rear corner in the process of roping the seal from the lower rear corner up to the upper from corner of the glass. Helping hands are a big plus, but doable solo.

The metal seal trim plate is a bear to install. The FSM says to start from the rearmost side and work towards the front. I tried this for 45 min unsuccessfully. It may require two people to do it this way because you need to maintain perfect stability, alignment and simultaneously hammer (mallet) the seal into the channel.

I chose instead to start at the front most edge and work rearwards as the front edge is held by tangs and is aligned and therefore you only need to use a rubber mallet to progressively work the trim into the channel. This way took 10 min. but hey, I'm neither unionized nor paid by the hour, so pick the method that works best for you.

Everything is fairly straight forward in this job, no real special concerns. Hope this helps.