It seems we started this project forever ago. We have been trying to get the new firewall in the truck. Every time we thought we were ready to put it in we found something else that should be done before we put it in. All in all I'm glad we did it right the first time. Every thing fit just as it should. Here are some pics to show how we went about it.
This is the empty hole. The floor and trans tunnel are all finished. We then went around the face of the cowl area in the dark with a light and welded up any pin holes in welds from the rust repair. The new firewall has a mounting flange that covers this area, so I don't want any moisture to get between those panels and into the cab. After all the holes were taken care of, I coated the area with Eastwood's rust encapsulator. This was to help curb any development of rust from factory seams we did not take a part.
Before mounting the piece, we applied a bead of seam sealer to the mating face of the cowl. This is mostly to eliminate any potential vibration between the 2 sheet metal panels. We also sealed the bottom weld seam. This will be done on the inside of the wiper tray before paint as well.
I also coated the back of the firewall mounting flange with self etching weld through primer for an added level of protection.
We then used cleco's to hold the firewall on and braced it to hold everything flat for alignment while tacking.
And FINALLY, here it is all tacked in. The fit to all the mating panels is excellent. Now it's time for me to try to weld it in and finish it with out screwing up all our hard work!
Thanks for looking!