09/11/2018
RANS S-21 OUTBOUND
TEXT MANUAL
11-7
ROTAX 912 ULS - FUEL SYSTEM - FUSELAGE
1.
Locate Header Tank Mount per
FIGURE 11B-01/912
. Transfer drill #30 through
each tab. Glue Rubber Edging to top edge of Mount flanges. Rivet Header Tank
Mount to top of tabs.
HEADER TANK ASSEMBLY
2.
Locate and drill fitting holes in Header Tank per
FIGURE 11B-02/912
. Do NOT
drill the sump drain holes until fitting of the tank to the fuselage. For drilling the
holes a 1/2" Unit-Bit
®
and 3/4" Unit-Bit
®
work best. Locate center of each hole
with a #30 drill bit, then drill full size. Deburr all holes. Thoroughly clean tank
several times by rinsing with water. After confirming that all foreign material has
been removed, let dry prior to installing fittings.
NOTE:
If it is anticipated that the plane will be converted between Trike
and Taildragger, then it is recommended to install sump drains in both
locations.
DOUBLE & TRIPLE CHECK HOLE LOCATIONS BEFORE DRILLING.
3.
To install the fuel fittings into the tank, obtain a piece of wire. Safety wire works
well. Insert wire through one of the fitting holes in the tank and up through the
filler neck. Refer to
FIGURE 11B-03/912
. Install an O-Ring onto the tank
withdrawal fitting and slide this assembly over the wire extending from the filler
neck. Bend a loop in the end of the wire to keep the fitting and O-Ring from
falling off. Pull the fitting through the hole. Slide a flat rubber washer, thick steel
washer, and a retaining nut over the wire and onto the fitting. Apply Loctite to
threads and thread the nut on before removing the wire.
CAUTION:
Do
NOT
get Loctite on the rubber washer.
4.
Use an Allen wrench inserted into the tank fitting to hold the fitting while
tightening the retaining nut.
IMPORTANT:
Do not allow the fitting or thick washer to rotate while
tightening or leaks may occur.
HINT:
Prevent the thick washer from turning by holding with needle-nose
Vise-Grips.
5.
Apply thread sealant to fittings and install into the tank fittings. Again, allow no
rotation of the tank fitting. Refer to the parts manual for the correct parts.
6.
Perform a leak test by capping off all fittings and pressurizing the tank to 1 PSI
and let set for a period of time.