Assembling the Firewall – 3

I needed to make provision for the brake lines by riveting a F-6122-1 bracket to the firewall. This is the bracket that holds the fittings that connect the flexible brake hoses from the master cylinders to the solid brake lines leading to the wheels. I then drilled the Bracket to the firewall as shown on DWG 19, Firewall Bulkhead Rear View.

Then I clecoed in the firewall recess (necessary to provide room for the oil filter and prop governor) F-601K-1 in the square hole centered in the F-601A-2 bulkhead and drilled all the holes to full size.

Then I fit and drilled and riveted the F-601Z Fuel Pump Doubler to the lower firewall. The nutplates were on the forward side of the firewall and the rivets holding them penetrated both the F-601A-2 stainless firewall and the F-601Z doubler.

Next I disassembled the firewall, dimpled F-601A-2 and F-601K-1, then machine countersunk the underlying stiffeners and spacers. I built the firewall using flush head rivets, with the flush heads on the forward side, giving it a smooth surface and making the firewall easy to clean and easy to fit brackets, etc.

Time:  6 hours.