Piper Comanche PA-24 Service Manual page 537

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PIPER COMANCHE SERVICE MANUAL
3.
Check throttle and mixture conaol rods and levers for tip ...... and lock.
4. Remove and clean 'he injector fuel inlet strainer
at
the
fll'S<
25 bour inspection and each '0
hour inspectIon themf,er. Damased
strainer
"0"
rinp should be replaced. Torque
strainer
'0
6'·70 inch
pound5.
b. TestS prove that gasoline which becomes sale due
'0
prolonged 5[o . . e absorbs oxygen rapidly.
This sale OXIdized gasoline acquires a very distinctive odor similar to vamish, auses rapid deterioration of
synthetic rubber parts, and aI50 fonns a gummy deposi' on the internal metal parts. This condition.
however, docs not occur dunn, normal operation of the injector where fresh fud is beill8 collSWldy
circulated.
7B·26. Lubriation Of Fud InjectDr.
L
There is very little nced for lubrication of the injector in the field between regular overbauls.
H"wever. the
clevis
pins used
in
connection
With
the throttle a.ad manual mixture c:oDtrOllcva'S should
be
checked for freedom of movement anci lubricated. ii necessary.
b.
Place. drop of engine grade oil on the end of the wo' ;. shaft in such a manner that i, can work
ln'O
the throttle shaft bushings.
7B·27. Removal Of Fud InjectDr.
a. RernO\'e the bottom cowling (Refer
'0
parqrapb 7B-4 )
b. Remove air intaXe hose from filter box.
c. Release the fastenen around the air box
Uld.
remove from
b.ck
plate.
d. Rcmm"c nua and bolts from clamp l.S5Cmbly
at
the injector unit.
c. Remove safety wire and screws from all' box back plate.
f. Remove back plate and clamp assembly from injector unit.
g
Disconnect throttle and mixture control cables from injector unit.
n.
Disconnect fuei lines from injector unit.
1.
Remove pa.llocknun and nuts from injector unit mO,"lnDng studs.
J- Remove fueilnjeCtOr from mountmg pad.
18-28. Prepanu::ion Of Fuel Injector For Shippinl. Any unit taken oui of service. or
UnitS
being returned
for overhaul, must be flushed WIth preserving oil (Specification MIL.Q-6081. Grade IOI()). uSlIlg the
foUowmg procedures:
a. Remove plugs and drain all fuel from the injector. If available, apply 10
'0
I'
pSI air pressure to
'he fuel inlet until all fuel is discharged from 'he injector.
b. Replace plugs and apply flushlll8 ou fII,ered through a 10-micron filter
at
13-15 psi
'0
the injec,or
fuel inlet unul
ou
is discharged from the outlet.
c. Replace fuel >nler shIpping plug.
CAUTION
Do not exceed the above air pressure as internal damage to the injector
mav
result.
POWER PLANT
ISSUED: 8/18172
2
F7