Piper Navajo PA-31 Service Manual page 617

PIPER NAVAJO SERVICE MANUAL
9-43.
CLEANING, INSPECTION AND REPAIR.
a. Clean all parts in oil solvent such as mineral spirits.
b. Inspect all parts
for wear,
with special attention
to the insert,
rotor and
blades.
(Check wear limits per Table IX-I.)
c.
Repair is limited to replacing parts that are defective
or worn.
9-44. ASSEMBLY OF ELECTRIC FUEL PUMP. (Refer to Figure 9-12.)
a.
Replace the bearing insert
retainer
(24) and press
flush with body housing
(1).
b. Lubricate
"O" ring seals with Parker "O" Lube or equivalent
to facilitate
reassembly.
c. Replace the valve spring(8)
and piston assembly(7).
Check for free move-
ment of plunger.
d. With the piston assembly
(7), valve spring (8), adjustment
guide (9) and
adjustment
screw (10) in place,
secure with Tru-Arc
retaining
spring (12).
e. Install the rotor (4) into the insert (3) and the rotor blades (17) into the slots
with the notches toward
the outer edge of the insert.
Secure the blades with the
blade retaining spnng
(5). Clearance across the top of the rotor and blades should
measure a nominal
.0005 after reassembly.
f. Replace the two "O" ring seals (22) on the insert
(3).
g. Install the insert
and rotor assembly
into the pump body (1).
h. Install the "0" ring seal (21) on the insert
plug (2) and install
plug into
pump body (1).
Newer pumps with wear plate (25) in plug (2), be sure the wear
plate spring (26) is between the wear plate (25) and the plug (2), before installing
plug into pump body.
i. Replace
the seal cage (14), seal washer (18) and seal spring (19) on the
rotor shaft before installing
the motor to the pump body.
j . Replace the motor on the pump body being sure the female end of the motor
shaft fits over the male end of the rotor shaft. Secure the motor with attachment hardware.
k. Replace
the cover on the end of the motor housing and secure
with two
screws.
1. Adjust pump in accordance
with Paragraph
9-45.
Reissued: 10/12/79
FUEL SYSTEM
3C1