Another item I wanted to get prepped for a top coat of paint is the frame for the oil cooler. The FF-1212 oil cooler frame receives dimples on the inside edge where it attached onto the FF-1214 oil cooler faceplate. The FF-1214 receives the most attention because the #40 rivet holes are to be machine countersunk on the forward surface and there the FF-1212 oil cooker frame mates in the inside edge of the faceplate.
Machine countersinking the FF-1214 oil cooler faceplate using a #40 100 degree countersink bit.
After the necessary countersinks and dimples were made, the two pieces were riveted together … the nutplate rivet holes are to be left open at this time.
Riveting the FF-1212 oil cooler frame onto the FF-1214 oil cooler faceplate using AN426AD3-3.5 rivets.
Now the parts are ready to be top coated with POR 15 white engine enamel ... if it stops raining long enough this afternoon to have a quick paint session for the small handful of firewall forward parts remaining to paint.