Piper Aircraft Corporation Malibu Mirage PA-46-350P, Airplane Maintenance Manual

Page: 1393 / 1956

PAGE 1
Feb 28/07 7E19
73-10-00
PIPER AIRCRAFT, INC.
PA-46-350P, MALIBU MIRAGE
MAINTENANCE MANUAL
DISTRIBUTION
1. Fuel Injection System
A. Description
WARNING: FAILURE TO CONSULT APPLICABLE VENDOR PUBLICATION(S), WHEN
SERVICING OR INSPECTING VENDOR EQUIPMENT INSTALLED IN PIPER
AIRCRAFT, MAY RENDER THE AIRCRAFT UNAIRWORTHY. (SEE INTRODUCTION
- SUPPLEMENTARY PUBLICATIONS.)
The PA-46-350P is powered by a Textron Lycoming (TIO-540-AE2A) engine and is fuel injected to
achieve even fuel distribution to all cylinders for a smooth and efficient running engine.
A vaned, positive displacement, engine driven fuel pump supplies fuel under pressure to the fuel
injector servo metering unit. This metering unit determines the proper amount of fuel to be sent to
the flow divider where the fuel flow is distributed equally among the six injector nozzles.
To atomize the fuel in the injector nozzles prior to entering the cylinder, turbocharged compressed
air pressure (deck pressure) is picked up just prior to the throttle valve injector metering unit and
distributed evenly to each injector nozzle where it atomizes the fuel prior to entering the cylinders.
The nozzles continuously spray and atomize the metered fuel into the intake valve port of the
engine cylinder heads in proportion to induction airflow.
B. Maintenance
(1) Little attention is required between scheduled injector overhauls. Check the following items
during periodic inspection of the engine:
(a) Check tightness and lock of all nuts and screws which fasten the injector to the engine.
(b) Check all fuel lines for tightness and evidence of leakage. A slight fuel stain adjacent to
the air bleed nozzles is not cause for concern.
(c) Check throttle and mixture control rods and levers for tightness and lock.
(d) Remove and clean the injector fuel inlet strainer at the first 25 hour inspection and each
50 hour inspection thereafter. Damaged strainer O-rings should be replaced.
(2) 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 forms a gummy deposit on internal metal
parts. This condition does not occur during normal operation of the injector where fresh fuel is
being constantly circulated.
C. Lubrication
(1) 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. There is no need for
lubrication of the injector in the field between scheduled overhauls.
(2) Place a drop of engine grade oil on the end of the throttle shaft in such a manner that is can
work into the throttle shaft bushings.
2. Fuel Injector
A. Removal
(1) Remove the lower cowl panel.
(2) Disconnect the throttle and mixture control cables at the injector. Disconnect the control rod
that comes from the absolute pressure controller.
(3) Disconnect the fuel inlet, flow, pressure and discharge lines at the injector.