PIPER
SENECA
II
SERVICE
MANUAL
3. Observe for bubbles which would indicate leakage.
If
bubbles appear
at
either fuel fitting,
there
is
a leak in the fuel tube.
If
bubbles appear externally on the shroud tube or at either end
of
the
shroud tube juncture, the shroud tube is leaking.
4. In either
of
the above cases, the complete fuel feed and nozzle holder assembly must be
replaced.
e.
Spray test the nozzle (21, Figure 13-18 or 13-19)
as
follows:
1.
Install the nozzle in the fuel feed and nozzle holder assembly and connect the fuel tube
to
the fuel solenoid. Connect the solenoid
to
a 7 psi fuel pressure source.
2.
Connect the solenoid leads to a 12-volt battery. Connect a switch in the line to open and
close the solenoid when desired.
3. With the switch closed (solenoid
valve
energized) and the fuel line connected, observe the
fuel spray pattern. It should
be
conical in shape with even dispersion in all directions.
WARNING
Be
sure
to
keep the atomized spray away from fire.
4. Energize and de-energize the solenoid several times. The spray should shut
off
permanently
each time the solenoid
is
de-energized. There should be no
sign
of
dribbling at the nozzle tip in excess
of
one or two drops.
5.
If
the spray pattern
is
distorted, check for an obstruction and clean the nozzle
as
described
in Paragraph 13-57 or 13-62,
i.
If
this fails
to
provide a normal spray pattern, replace the nozzle.
6.
If
the nozzle continues
to
dribble, the solenoid valve is
not
closing properly and the solenoid
valve must
be
replaced.
13-64.
REP
/\IR
OF
COM
BUSTI
ON
TUBE
ASS
EM
BLY.
No
weld
or
braze
repairs
of
the
combustion
tube
assembly
arc
authori1cd.
Revised:
12/08/83
2K23
HEATING
AND
VENTILATING
SYSTEM
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