Piper Comanche PA-24 Service Manual page 588

PIPER COMANCHE SERVICE MANUAL
7C-39. Prep ... tion Of Pud Injector Por SblppiaJ. Any unit taken out of semce. or units being returned
for overhaul, must be flushed with pmervm, oil (Specification
MIL~~8I,
Grade 10(0), usinS the
foUowinJ procedures,
a.
Remove pI .... and drsin aU
fuel from the injector. If anil.able, apply 10 to 15 psi air pressure to
the fuel inlct until
aU
fuel
is
discharged from the injector.
b. Replace pi .... and apply f1ushiDJ oil rdtered throUJh a IG-mieron rdter
at
13-15 psi to the injector
fuel inlet until oil is discharged from the outlet.
c. Replace fuel inlet shippinS pluS.
CAtrrlON
Do not exceed the above air pressure u internal damlJe to the injector
may rcault.
d. After fiUiDJ with pre5Cl"Vati.., oil, the injector should be
protecte~
'rom dust and dirt and given
such protection against moisture as climatic conditions at the point of storage require. In most c&scs,
storing the unit in a
dry
area will
be sufficient.
e. If the unit
is
to be stored near or shipped
0"'"
salt _ter, the foUowing precautions should be
observed,
1. Spray the exterior of the injector with an appro..,d preservative oil.
2. Pack in a dustproof container, wrap the conWner with moisture and vapor-proof material and
seal. Pack the wrapped unit in • suitable shipping case. Pack a one-half pound blJ of silica gel erysta1s in the
dustproof container with injector. The bag must not touch the injector.
CAtrrlON
Extreme caution should
be
exercised when handling or working around
the injector to prevent oil or fucl from entcring the air sections of the
injector. As explained previously, damlJe to the
&ir
diaphrlJRl wiD
result. Fluid can easily enter the
air
section of the injector through the
impact tubes or the annular groove around the vcnruri. For this rcason.
a protective plate should be installed on the scoop mounting flange
when performinl routine maintenance on the engine. Such as washing
down the engine and air scoop, semcing the air filter (surplus oil on the
element>, or when injecting preservative into the engine prior to storing
or shipping.
7C-40. Prep ... tion Of Fuel Injcctor For Service. Fuel injectors that have been prepared for storlJe should
undergo the foUowing procedures before being placed in service.
a. Remove and clean the fuel inlet suaincr assembly and reinstall.
b. Inject clean fuel into the fuel inlet connection with the fuel outlets uncapped until clean fuel flows
from the outlets. Do not exceed 1 S psi inlet pressure.
PDWERPlANT
ISSUED:
'I1.m
2
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