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UNI-Mechanics 2000
1.6.5 Fueltank
(bag U2-6)
The shape of the fueltank has been designed specifically to suit the helicopter mechanics; the
bung should be on the right-hand side. Bend the metal tube (or tubes) to the shape shown in the
drawing. The tube ends must be located right at the top and right at the bottom of the tank.
Check that the clunk weight is completely free to move, and that it always falls to the bottom
when you swivel the tank by hand. Push the brass collar over the neck of the tank; it ensures
that the neck cannot burst when the screw is tightened and the rubber bung is compressed.
The fueltank is assembled as shown in the exploded drawing. The rubber bung features a hole
for the retaining screw, plus two through-holes for the brass tubes, and a third „blind" hole (for
other optional purposes). The third hole can easily be continued through the bung if you wish.
Assemble the fueltank, then tighten the central screw firmly to expand the rubber and seal all
the joints.
The tube running to the top of the tank (the vent) should be used as the pressure line, and for
this purpose it is connected to the pressure take-off nipple on the silencer. If you prefer to use
only one tube (the top one) in addition to the clunk feed line, then you must disconnect the fuel
line between the clunk weight and the carburettor for filling and draining the tank. You can avoid
this awkward procedure by installing a two-way filler valve, Order No. 1657, in the appropriate
hole in the switch console, and loop it into the fuel line from the fueltank to the carburettor; if you
don't fit this valve, you will have to pull the feed line off the carburettor every time you refill the
tank.
Make up the fuel line to the motor using fuel tubing and a fuel filter; note that the connection to
the carburettor should be as short as possible.
1.7 Assembling the chassis sub-structure
(bag U2-4)
Assemble the chassis sub-structure from the components shown in the illustration, using the
stated sizes of screws.
Note:
Remove all rough edges from the side frames 4448.34 where they contact the fueltank.
If you are using a clutch bell with a 14 mm pinion, you will need to enlarge the glowplug access
opening in the air duct 4448.35 in such a way that the plug can easily be screwed in and out.
Check this by holding the air duct against the bottom edge of the fan housing (already installed)
before fitting it permanently.
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