Sunday, October 18, 2015

RV-12 Fuel Tank Completed – Almost

In spite of the cold temperatures, with the help of Mike K. the remaining T-1204A-1 top tank skin was riveted onto the RV-12’s fuel tank. Because of the desire to coat every rivet on the inside of the fuel tank with sealant, a deviation from the plans was made and the mechanical fuel gauge was not installed at this time to allow for easier access to the inside rivets.

After mixing the tank sealant, a small dollop of tank sealant was placed on the threads of the fuel return line being careful not to place any sealant on the tapered portion of the fitting.  The fuel return line was placed in position and the fitting was made finger tight. The top tank skin was temporarily placed in position with a few Clecos to hold it ... then the two T-1216 clips were placed over the fuel return line and secured with Clecos. This was done so the fuel return line fitting could be tightened without moving the aluminum fuel return line out of position ... this was accomplished by reaching through the hole for the sender plate and using a crows foot wrench to tighten the fuel return fitting . After the fitting was tightened, the clips were removed and the top skin removed. Tank sealant was applied to the T-1204A-1 top skin and the associated mating surfaces ... then the parts were Clecoed together for riveting. Once the tank's top was riveted in place, the area around the rivet holes for the T-1216 clips was slathered with fuel tank sealant and the clips were placed over the fuel return line and riveted onto the inside of the tank. Next the tank was placed upside down on blocks of wood and by reaching in through the sender plate hole, a syringe filled with tank sealant was used to coat the shop heads of all of the 82 newly installed rivets with tank sealant ... along with filling the corners and gaps.
Completed fuel tank assembly (minus mechanical fuel gauge, sender plate and sender) placed in the warm  light box so the tank sealant can cure properly during the cold evenings.

During the next work session, plan to install the mechanical fuel gauge and screw the sender plate in position.