Piper PA-24 Comanche Service Manual page 462

PIPER COMA:"IiCHE SERVICE :\1A:\l'AL
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FIGl'RE
7C-8.
Fl'EL AIR BLEED
SOllLE
7('
-~.
Fuel Air Bleed Sozzles.
'T-45.
Removal
or
Fuel Air Bleed Nozzles. The nozzles must be carefully removed as they or the
C\
Iinders
,
. -
may he damaged.
a.
Remove the top engine cowl.
b. Disconnect vent line from shroud by expanding clamp and removing line.
I.:.
Disconnect the fuel line from the nozzle,
d.
Remove the spring retainer. spring and shroud from the nozzle.
e. Carefully remove nozzle. using the correct size deep socket,
I. Clean and inspect the nozzle as given in paragraph 7C-46,
7('
-4n.
Cleanina And Inspection
or
Fuel Air Bleed Sozzle.
a. Clean the nozzle with acetone or Methylethylketone I MEK) and blowout all foreign particles \\ ith
compressed air in the direction opposite that of fuel flow. Do not use wire or other hard objects to clean
,mficcs.
b. Inspect the nozzle and cylinder threads for nicks. stripping or cross-threading and battered or
rounded hexauons.
c. Insrect and replace nozzle O-rings found to be cracked. brittle or distorted. Refer to Lycoming
Sen ice In..trucuon
'0,
1275 for detailed test procedure of air bleed nozzles.
•
POWER
PtA'T
2HI0
ISSt'ED; 8/18/72
"T .~7.
Installation
or
Fuel Air Bleed Nozzles.
a.
It i.. important for the nozzles
to
be correctly positioned with the bleed hole facing upward.
h. Insrall the n077le5 and torque to flO inch-pounds.
c. Ascertain that the O-rings are properly installed on the nozzle stem and install the nozzle shroud.
(Refer
to
Figure "C-li.)
d. C onnect the vent to the nozzle shroud.
e. Install the spring and spring retainer on the nozzle stem.
f. Connect the fuel line to the nozzle and adjust the connecting vent line to align and center the
injector nozzle with the injector nozzle shroud and secure with clamps,
g. In..ta II the top engine cow
l.