Auxiliary Fuel Pump Disassembly And Assembly; Removal And Installation - Cessna 177 SERIES Service Manual

on. The pump parallels the engine-driven fuel pump
dirt and solvent with air pressure. Check gasket (2)
and is used when fuel pressure drops below 2 psi.
and replace if deteriorated. Clean cover (1).
Fuel bypasses the auxiliary pump when the pump is
d. Remove retainer (5) from tube (11) using thin
not in operation. The auxiliary pump is used as a
nose pliers to spread and remove ends of retainer
boost in starting and in the event of engine-driven
from tube.
pump failure.
e. Remove washer (6), O-ring (7), cup valve (8),
spring (9) and plunger (10) from tube (11).
12-41.
REMOVAL AND INSTALLATION.
f. Wash parts in solvent and blow out with air
a. Remove cowling as necessary to gain access to
pressure. If plunger does not wash clean or if there
pump.
are any rough spots, gently clean surface with crocus
b. Remove safety wire from shut-off valve control
cloth. Slosh pump assembly in solvent, being care-
knob and pull control to "OFF" position.
ful not to submerge electrical lead (14).
Blow out
c. Drain fuel from pump, lines and strainer with
tube with air pressure and swab inside of tube with a
quick-drain control.
cloth wrapped around a stick.
d. Ensure master switch and pump switch are in
g. Insert plunger (10) into tube (11), buffer spring
"OFF" position.
end first. Check fit by slowly raising and lowering
e. Disconnect and cap or plug all fuel lines at pump.
plunger in tube. If a click cannot be heard, inter-
(Observe the precautions in paragraph 12-3.)
rupter assembly is not functioning properly and pump
f. Disconnect electrical lead from pump. should be replaced.
g. Remove attaching bolts and remove pump. h. Install spring (9), cup valve (8), O-ring (7) and
h. Reverse preceding steps for installation. washer (6).
Compress spring (9) and install retain-
i. Push shut-off valve control knob to "ON" posi-
er (5) with ends of retainer in side holes of tube (11).
tion and check for leaks.
i. Place gasket (2) and magnet (3) in cover (1) and
j. Safety wire shut-off valve knob to its mounting
install filter (4) and cover assembly. Twist cover
bracket with . 018 inch diameter mild steel safety
by hand to hold in position on pump body.
Using
wire.
5/8" wrench. securely tighten cover (1).
12-42. DISASSEMBLY AND ASSEMBLY. (See fig-
{CAUTION
ure 12-8. )
a. With 5/8" wrench, release cover (1). Twist
Do not tamper with seal at center of mount-
cover by hand to remove from body (13).
ing bracket (12) as it retains the dry gas,
b. Remove filter (4), magnet (3) and gasket (2). which surrounds the electrical system in the
c.
Wash filter (4) in cleaning solvent and blow out
upper portion of the pump.
SHOP NOTES:
12-16