Piper Comanche PA-24 Service Manual page 587

PIPER COMANCHE SERVICE MANUAL
7C· 3S. Fuel Injector.
7C·36 FuelInjector Maintenance.
a. In general, little attcntion is required between injector overhauls. However, it is recommended that
the following items be checked during periodic inspection of the engine.
1. Check tightness and lock of all nuts which,fasten the injector to the engine.
2.
Check all fuel lin .. for tightness and evidence ofleakage.
3. Ched. thronle and mixture control rods and levers for tiBhtncss and lock.
4. Remove and clean the injector fucl inlet strainer at the fint 2S hour inspection a.nd each
SO
hour inspection thereafter. Damaged strainer "0" rings should be replaced. Torque mainer to
65-70
inch
pounds.
b. Tests prove that gasoline which becomes stale duc to prolonged storage absorbs oxygen rapidly.
This stale oxidized gasoline acquires a very distinctive odor similar to varnish, causes rapid deterioration of
synthetic rubber parts, and also fonns a gummy deposit on the internal mew pans. This condition,
however, docs not occur during normal operation of [he i~;. :;tor where fresh fuel is being constantly
circulated
7C·37. 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 Pla.ce a drop of engine grade oil on the end of the throttle shaft in such a manner that it can work
into the throttle shaft bushings
7C'38 Removal Of Fuel Injector.
a. Remove the bottom engine cowl.
b. Disconnect flexible ducts from compressor discharge box.
c. Remove compressor discharge box from injector unit by removing safety wire and cap screws
d. Disconnect throttle and mixture control cables from injector un,it.
e. Disconnect inlet and outlet fuel hnes from injector unit
f. Remove both inboard turbocharger support braces.
g. Remove remaimng nuts attaching injector to engine.
h. The mixture control cable bracket may be removed from the injector unit by removing attaching
safety wire and screws
2 H5
POWER PLANT
ISSUED:
8118172