Piper Navajo PA-31 Service Manual page 623

9-51. CLEANING, INSPECTION AND REPAIR.
a. Clean all parts
in oil solvent such as mineral
spirits.
b. Inspect all parts for wear and replace
any that are defective.
c. The pump end assembly
should be replaced
as a complete unit.
d. Motors should be replaced
with new ones if found defective.
9-52.
ASSEMBLY OF ELECTRIC FUEL PUMP. (Refer to Figure 9-12a.)
a. Install the new shaft seal (2) into the insert
(3) with a light press fit.
NOTE
Lubricate "O" ring seals
with Parker "O" Lube or
equivalent to facilitate
reassembly.
b. Install the piston assembly
(9) into the pump body (4) in accordance
with
Figure 9-12a. Insert
the valve spring (10) into the end of the piston assembly
(9).
c. Assemble
the "O" ring (11) onto the guide(12) and install the valve adjust-
ing screw (13) and locknut (14) into the guide (12).
d. Install the adjusting guide assembly
(12) into the pump body (4) as shown in
Figure 9-12a for proper reassembly
of component parts.
e. Using a light arbor press,
apply pressure
to the valve adjusting screw (13)
and install
the Tru-Arc retaining
ring (15) with Tru-Arc
pliers.
NOTE
Check for free movement of plunger after reassembly.
f. Install the motor if it was removed,
being careful to align the female
end
of the motor shaft over the male end of the rotor
shaft. Secure the motor
with
the four screws required.
g. Adjust the pump in accordance
with paragraph 9-53.
Reissued: 10/12/79
3C7
FUEL SYSTEM
3C7
PIPER NAVAJO SERVICE MANUAL