Piper PA-24 Comanche Service Manual page 458

PIPER COMANCHE SERVICE MANUAL
7C-39. Preparation Of Fuel Injector For Shippm,. Any unit taken out of service. or units being retumed
for overhaul. must be nushed with preserving oil (Specification MIL.Q-6081, Grade 1010), using the
fonowing procedures:
a.
Remove pluJS and drain all fuel from the injector. If available, apply 10 to 15 psi air pressure to
the fuel inlet
un~
all fuel is discharged from the injector.
b. Replace pluJS and apply flushing oil fdtcred throuah a 100rnicron fllter at 13-15 psi to the injector
fuel inlet until oil is discharged from the oudet.
c. Replace fuel inlet shipping plq.
CAUTION
Do not exceed the above air ptaSW't as internal
damaJe
to the injector
may result.
d. After filling widl preservative oil, the injector should be protected from dust and dirt and given
such protection against moisture as climatic conditions at the point of storace require. In most cases,
storing the unit in a dry area win be sufficient.
e.
1f
the unit is to be stored
near
or shipped over salt water, the following precautions should be
observed:
1. Spray the exterior of the injector with an approved preservative oil.
2. Pack in a dustproof container, wrap the conumer with moiSture and vapor-proof material and
seal. Pack the wrapped unit in a suiuble shipping cue. Pack a
on~balf
pound baa of silica gel crystals in the
dustproof container with injector. The baa must not touch the injector.
CAUTION
Extreme caution should
be
exercised when handling or workin, around
the injector to prevent oil or fuel
hom
entering the air scctions of the
injector. As explained previously,
dam.
to the air diaphrapn will
result. Fluid can euily enter the air section of the injector through the
impact tubes or the annular groove around the venturi. For this reuon,
a protective plate should be installed on the scoop mounting flanse
when performing routine maintenance on the engine. Such as washing
down the engine and air scoop, servicing the air falter (surplus oil on the
element), or when injecting preservative into the engine prior to storing
or shipping.
7C-40. Preparation Of Fuel Injector For SCIYicc. Fuel injectors that have been prepared for storlie should
undergo the foUowing procedures before being placed in service.
a. Remove and clean the fuel inlet strainer uscmbly and reinsuU.
b. Inject clean fuel into the fuel inlet connection with the fuel ouden uncapped until clean fuel flows
from the outlets. Do not exceed 15 psi inlet pressure.
POWER PLANT
ISSUED: II18n2
2 "6
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