Piper Navajo PA-31 Service Manual page 613

PIPER NAVAJO SERVICE MANUAL
9-31. ADJUSTMENT OF CROSS-FEED VALVE.
a. Remove the access covers located on the underside of fuselage, below the fuel
selector panel just ahead of the main spar and the access panels between the fuselage and the
underside of the wings.
b. Ascertain that the control cable wire is connected to the crossfeed valve handle in
the cockpit. The wire on the valve handle should be free to rotate.
c. Place the cross-feed handle in the cockpit in the OFF position.
d. Assemble the swivel assembly, with the control cable wire, on the arm of the
cross-feed handle. Adjust and secure the swivel fitting to obtain a maximum of
seven-sixteenth of an inch between the center of the pin that goes through valve and valve
body. (Refer to Figure 9-10.)
e. Move the cross-feed handle to the ON position and ascertain that there is a minimum
of one inch between the center of the shaft pin and the valve body.
f. Actuate the selector to ascertain proper operation and maximum and minimum
travel of the valve shaft.
g. Reinstall the access and selector panels.
9-32. ADJUSTMENT OF EMERGENCY SHUT-OFF VALVE.
a. Remove the fuel selector panel cover in the cockpit and the access panel to the
control valve located just ahead of the main spar between the fuselage and the underside of
the wing.
b. Ascertain that the control cable clevis ends are connected to the arm of the shut-off
lever in the cockpit and the arm of the shut-off valve. Allow the jam nuts of the devises to
remain loose.
c. Rotate the control cable from under the wing so that the valve will contact its stops
before the lever in the cockpit contacts its stops.
d. Reinstall the access and selector panels.
9-33. FUEL FILTER.
9-34. REMOVAL OF FUEL FILTER. (Refer to Figure 9-9.) The instructions given are for
the removal of the complete filter from the airplane. For cleaning and servicing purposes
only, steps a and b of this paragraph are necessary; then proceed to paragraph 9-35.
a. Turn the fuel selector valve to the OFF position.
b. Remove the access panel forward of the main spar, between the underside of the
wing and the fuselage.
c. Disconnect the electrical leads to the fuel pump.
d. Disconnect the fuel lines to the filter and fuel pump. Cover the line ends to prevent
contamination.
e. Remove the bolts that secure the filter and pump to their mounting brackets.
f.
Separate the filter from the fuel pump.
Reissued: 10/12/79
FUEL SYSTEM
3B21