Piper PA-24 Comanche Service Manual page 457

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PIPER COMANCHE SERVICE MANUAL
7C-35. Fuel Injector.
7C-36. Fuel Injector Maintenance.
a. In general. little attention 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 aU nuts which fasten the injector to the engine.
2. Check all fuel lines for tightness and evidence of leakage.
3. Check throttle and mixture control rods and levers for tightness and lock.
4. Remove and clean the injector fuel inlet strainer at the first 25 hour inspection and each SO
hour inspection thereafter. Damaged strainer "0" rings should be replaced. Torque strainer to 65·70 inch
pounds.
b. Tests prove that gasoline which becomes stale due 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 forms a gummy deposit on the internal metal pans. This condition,
however. docs not occur during normal operation of the injector where fresh fuel
15
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. Place 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 unit.
e. Disconnect inlet and outlet fuel lines from injector unit.
e.
Remove both inboard turbocharger support braces.
g. Remove remainina 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.
POWER PLANT
ISSUED: 8/18/72
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H5