Jabiru J450 Constructors Manual
Pre-Paint>Fuselage>Firewall forward>Fit firewall
Tuesday, April 6, 2010
46 of 343
Fit the firewall plate
Run a ¼” drill through the engine mount holes in the upper firewall (shown circled in the
photo below left). This will make fitting the top engine mount much easier.
Apply
a generous bead of the Dow Corning silicone sealant about 1” in from the edge of the
plywood firewall all the way around the perimeter and also in a zigzag pattern across the
firewall and then lay one insulating sheet onto the plywood firewall to the midpoint of the
firewall so that it is held by the sealant. Lay the other sheet and butt up to the first sheet in the
middle of the firewall. Pat the sheet into place and then cut to size with a sharp knife.
Apply the Dow Corning silicone sealant to the back of the firewall plate in the same manner:
around the outside and across the rest of the back, then place the plate onto the insulating
sheet and push firmly into place using the lower part of the firewall sheet as a reference.
Secure temporarily with 2 self-tapping screws at the base of the upper bend on both sides and
2 more in the holes just below the upper bend.