Piper COMANCHE PA-24-180 Service Manual page 462

7C-41. Installaion Of Fuel Injector.
a.
Install mixture control cable bracket on injector unit and secure with crews and safety wire.
b. Insall inector urut with gasket on engine and hold in place with washers and nu on the two
front mounting studs.
c.
Inall the inboard urbocharger uppon braces securin them to each aft injector mounting rsud,
to each turbochager inboard mouning lug and to the engine sump.
d. Safety the fuel injector mounting nut with pal nut and safety wire the cap screws securing the
turbocharger support braces to the engine sump.
e.
Connect the inlet and outlet fuel lines to the injector unit.
f. Connect the throttle and mixture control cables to the injector unit and adjust per paragraph
7C42.
g. Insallation compressor discharge box with gasker on injector unit and scure with cap screws and
safety wire.
h. Connect flexible ducts from compressor outlet to compressor discharge box and secure with
clamps.
i.
Adjust idle speed and mixture. (Refer to paragraph 7C-4.)
j.
Insall engine cowling. (Refer to paragraph 7C-7.)
7C-42. Adjusunenr Of Throttle And Mixture Controls. The throttle and mixture controls are adjusred
when the throttle urn on the injector is rotated forward aginst it full throttle stop and the mixture rnn is
rotated forward against its full rich stop, their respective cockpit control should be .06Z of an inch in from
their full forward
stops.
a.
At the injector, disconnect the throttle and/or mixture control cable end from its control arm.
b.
Loosen the Jam nut securing the cable end.
c. Adjust the inkage by rotanng the cable end to obtain the .062 of in inch spnng back of the
cockpit control lever when the throttle or mixture control arm contacts is stop.
d. Reconnect the cable end to its control arm and secure jam nut.
e. Pull the throttle and mixture controls in the cockpit full aft to ascertain rha the injector idle
screw contucrs ts stop and the mixture control arm contacts its lean position.
7C43. Adjustment Of Idle Speed And Mixture.
a Start the engine and warm up in the usual manner until oil and cylinder head temperatures ire
normal.
b. Check magnetos. If the "mag-drop" is normal, proceed with idle adjustnent.
c. Close the throttle to idle. If the RPM changes appreciably after making the idle mixture
adjustment dunng the succeeding steps, readjust the idle speed to the desired RPM.
NOTE
The idle mixture must be adjusted with the fuel boost pump "ON".
POWER PLANT
ISSUED: 8/18/72
2H8
PIPER COMANCHE SERVICE MANUAL