Piper PA-24 Comanche Service Manual page 411

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PIPER COMANCHE SERVICE MANUAL
J. Check chronle and mixture control
rods
and levc:n for ti,htnCSl and lock.
~.
Remove and clcsn the injector fuel inlet strainer
It
me
fllSt 25
hour inspection and each 50
hour inspection thernfter. Dunaged strainer "0" rings should be
replaced. Torque strainer to 65-70 inch
pounds.
b. Tests prove that psoline which becomes sale due to proloapd uorqe absorb. oxyget rapidly.
This stale oxidized psoline acquires a very distinctive odor similar to vunish, causes rapid deterioration of
synthetic rubber parts. and aha fonns
I
gummy deposit on the internal metal
partS.
This condition.
however. docs not occur durinl normal operation of the injector where
fresh
fuel is being consundy
c1rculated.
78·26. Lubricalioa Of Fucllnjectot.
a. There: is very linle need for lubrication of the: injector
in
the field bftWecn rcpw overhauls.
Huwc:ver, the clevis pins used in connection with the throttle: and manual mixcure conrrollevcn should be:
checked for frcedom of movement and lubricated, if necessary.
b. Place a drop of enpne grade oil on the end of the throttle shaft in such a manner that it can work
into the throttle shaft bushings.
;'8-27. Removal Of Fuel Injector.
a. Remove the bottom cowlin,. (Refer to plf&lnPh 78-4.)
b.
Remove air intake
hose: from
filter box.
c. Release the fasteners around the air box lAd 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 plate.
f.
Remove back plate and clamp assembly from injector unit.
g.
Disconnect throttle and mixcure control cables from injector unit.
h. Disconnect
fuc:llincs from
injector unit.
I.
Remove pal locknuts and nuts from injector unit mounting scuds.
J. Remove fuel injector from mounting pad.
78·28. Preparation Of Fuel Injector For Shippinl' Any unit taken OUt of service. or units being returned
for overhaul. must be rlusheQ with preserving oil (Specification
MIL~-6081.
Grade 1010), using the
follOWing procedures:
a. Remove plup and dnin all fuel from the injector. If available. apply 10 to 15 psi
air pressure to
the fuel inlet until all fuel is dischatJed from the injector.
b.
Replace plugs and apply flushing oil filtered through
a
lO-micron filter at 13-1S psi to the Injector
fuel inlet until oil is discharged from the
euuee.
c. Replace fuel Inlet shipping plug.
CAUTION
Do not exceed the above air pressure as ineernal damage to the injector
may result,
POWER PLANT
ISSUED: 8/18/72
2
F7