Fuel Injector View; Fuel Injector Removal - Piper Navajo Chieftain PA-31-350 Service Manual

NAVAJO CHIEFTAIN SERVICE MANUAL
221
1. THROTTLE ARM
Figure 8-10. Fuel Injector
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 parts. This condition,
however, does not occur during normal operation of the injector where fresh fuel is being constantly
circulated.
8-60. LUBRICATION.
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.
8-61. REMOVAL OF FUEL INJECTOR.
a. Remove the lower cowl panel as described in paragraph 8-6.
b. Disconnect the throttle and mixture control cables at the injector.
c. Disconnect the fuel inlet, flow, pressure and discharge lines at the injector.
d. Remove the pal-locknuts and nuts securing the injector to the engine.
e. Loosen the two clamps securing the hose that is between the injector and injector inlet plenum.
f. Disconnect the necessary hoses and lines to the injector inlet plenum, so that the plenum may be
moved aft far enough to allow the injector to be removed.
Reissued: 9/23/80
POWER PLANT
219