Cessna 177 SERIES Service Manual

NOTE reading. Bourdon tube type oil pressure gage is installed.
Pressure is transferred to the gage through a pressure line,
Before
replacing a tachoeter cable in bos-
filled with kerosene, connected to the engine
main oil
ing, coat loer-two th rdwh AC-.Tpe-ST-
gallery. Beginning with airplane
serial 17702124, when
640 speedomeer
cable grease
or Lubiplate
not
modified by SK177-37
or SK177-55,
an electrical oil
No. 110- Insrt
cale in housing
as tar as pressure
gage is installed. The
gage is mounted on a
circuit
posible.
then slowly rorut
to sure it
board, which comprises
the back cover
of the dual gage
is seed
in engpm
ung.. Insert
cable-
.
instrument
cluster. The
gage is electrically
connected
to
tachometer,
nmaig sure
t Ls seaed in drive
the circuit board
by the gage mounting
screws. Power is
sharft
then recoen
t housingr and
torque to
supplied to
the circuit board
through the instrument
light
50
pound-inches
(at
Instrment).
circuit
breaker.
A
single
wire
connects
the
gage,
through
the circuit board, to a transducer mounted on the forward
15-35.
OIL PRESSURE
GAGE.
side of the
firewall.
Oil pressure
is transmitted
to the
transducer through
a pressure line connected
to the engine
15-36. DESCRIPTION. Thru airplane serial 17702123 main oil gallery.
and when modified by SK177-37 or SK177-55, a direct
15-37. TROUBLE SHOOTING-OIL
PRESSURE
GAGE
(DIRECT
READING).
TROUBLE
PROBABLE CAUSE
REMEDY
GAGE DOES NOT
REGISTER.
Pressure line clogged.
Check
line for obstructions.
Check line.
Pressure line broken. Check line for leaks and damage.
Replace
damaged
line
Fractured Bourdon tube. Replace instrment.
Gage pointer loose on
staft Replace
nstrument.
Damaged gage movement. Replace instrument.
GAGE POINTER FAILS Foreign matter in line. Check line for obstructions.
TO RETURN
TO ZERO.
Clean
line.
Foreign matter in Bourdon Replace instrument.
tube.
Bourdon tube
stretched.
Replace instrument.
GAGE
DOES NOT REGISTER
Faulty mechanism.
Replace instrument.
PROPERLY.
GAGE HAS ERRATIC
Worn or bent movement.
Replace instrument.
OPERATION.
Foreign
matter in Bourdon
Replace instrument.
tube.
Dirty or corroded movement.
Replace
instrument.
Pointer bent
and rubbing on
Replace instrument.
dial, dial
screw or glass.
Leak in pressure line. Check line for leaks and dam-
age.
RepaLr
or replace
damaged line.
15-15A
Change
8

Cessna 177 SERIES Specifications

General

Manufacturer	Cessna
Engine Type	Piston
Wingspan	35 ft 6 in (10.82 m)
Seating Capacity	4
Number Built	4, 295
Engine	Lycoming O-360
Horsepower	180 hp
Maximum Takeoff Weight	2, 500 lb (1, 134 kg)