Piper COMANCHE PA-24-180 Service Manual page 413

PIPER COMANCHE SERVICE MANUAL
3. Check throttle and mixture control rods and levers for rightnes and lock.
4. Remove and clean rhe injector fuel inlet strainer at the firs 25 hour inspection and each 50
hour inspection thereafter. Danmged strainer "0" rings should be replaced. Torque strainer to 65-70 inch
pounds.
b. Tests prove that gasoline which becomes stale due to prolonged storge absorbs oxygen rapidly.
This stale oxidized gasoline acquires very distinctive odor similar o varnish, causes rapid deterioration of
synthetic rubber parts, and also forms a gummy deposit on the internal metal parts. This condition.
however, does not occur during normal operation of the injector where fresh fuel is being constantly
crculated.
7B-26. Lubrication Of Fuel Injector.
a. There is very little need for lubrication of the injector in the field between regular overhauls.
However, the clevis pins used in connection with the throttle and manual mixture control levers should be
checked for freedom of movement and lubricated. if necessary.
b. Place a drop of engine grade oil on the end of the thro' shaft in such a manner that it can work
into rhe throttle shaft bushings.
7B-27. Removal Of Fuel Injecor.
a.
Remove the bottom cowling (Refer to paragrph 7-4 )
b. Remove air intake hose from filter box.
c. Release the fasteners around the air box and remove from back plate.
d. Remove nuts and bolts from clamp assembly at the injector unit.
e. Remove safety wire and screws from air box back place.
f.
Remove back plate and clamp assembly from injector unit.
g Disconnect throttle and mixture control cables from injecror unit.
h. Disconnect fuel lines from injector unit.
i.
Remove pal locknuts and nuts from iniector unit mountng studs.
J- Remove fuel injector from mounting pad.
7B-28. Preparation Of Fuel Injector For Shipping. Any unit taken our of service, or units being returned
for overhaul, must be flushed with preserving oil (Specfication MIL-O-6081. Grade 1010), using the
following procedures:
a. Remove plugs and drain all fuel from the injector. If available, apply 10 to 15 psi air pressure to
the fuel inlet untl all fuel is discharged from the injector.
b.
Replace plugs and apply flushing oil fitered through a 10-micron filter at 13-15 psi to the injector
fuel inlet until oi is discharged from the outlet.
c. Replace fuel inlet shipping plug.
CAUTION
Do nor exceed tne above air pressure as internal damage to the injector
mav result.
POWER PLANT
ISSUED: 8/18/72
2 F7