Cessna 177 SERIES Service Manual

15-48.
TROUBLE
SHOOTING
(Cont).
TROUBLE
PROBABLE
CAUSE
REMEDY
NO POINTER
MOVEMENT.
Faulty mechana
m.
Replace inrument.
Broken
pressre
line.
Check
lie and
coun
for
breaks. Repair
or replace
damsed line.
15-49.
CYLINDER
HEAD TEMPERATURE
GAGE.
wire runs
directly to the
instrument light
circuit breaker-
Rochester
gages
are electrically
connected
in the
same
15-50.
DESCRIPTION.
The cylinder
head temperature
manner as
the Stewart
Warner
gages, except
they
do not
gage is mounted
in thedual instrument
cluster
on the
have the calibration
pot and cannot
be adjusted.
Refer to
pilots
panel. A sending
unit
is installed
in the lower
side of
Table 2, on page
15-22B,
when trouble
shooting
the
No. 3 cylinder.
Thru 17702123,
on Stewart
Warner gages,
cylinder
head temperature
gage.
a potentiometer
is externally
mounted on the right
gage
mounting
screw (contact), a single
wire connects the
potentiometer
to the sending
unit. A
jumper wire
connects
the other mounting screw (contact)
to the fuel quantity
NOTE
indicator
lead
from
the instrument
light circuit
breaker.
For
Stewart
Warner
gages
a Cylinder
ead
Beginning
with
17702124,
on
Leigh
System
gages,
the
Temeratre
age
Cailratin
back cover
of the
cluster
is a circuit
board.
The
gage is
( 8243)
is
available
an may
be ordered
electrically
connected through
the circuit board
to the
gh the Cessna
Servie Parts
Centere
board
housing
plug.
One wire
from
the housing
cap
goes to
thoh
the
Ces cannot
be
recalibrater.
the
transducer,
located in.No3
eaias
cylinder,
the otherchester
gages
cannot
be recalibrat
15-51.
TROUBLE
SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
GAGE
INOPERATIVE.
No
current
to circuit.
Check circuit
breaker
and elec-
trical circuit
to gage.
Repair
electrical
circuit.
Defective gage, sending unit/ Isolate with ohmmeter check of
transducer or
circuit
circuits.
Repair
defective cir-
cuit.
Replace sending
unit/
transducer and gage.
GAGE
FLUCTUATES
RAPIDLY.
Loose
or
broken
wire
per-
Inspect
circuit
wiring.
Repair
mittlng
alternate
make
and
or
replace
defective
wire.
break
of gage
current.
GAGE
READS
TOO
HIGH
High
voltage.
Gage
off
Check
voltage
supply.
Replace
ON
SCALE.
calibration
gage
and
sending
unit/trasducer.
GAGE
READS
TOO
LOW
Low
voltage.
Gage
off
Check
voltage
supply.
Replace
ON
SCALE.
calibration.
gage
and
sendin
unit/transducer.
GAGE
READS
OFF
SCALE
Break
in
sending
unt/transducer.
Replace
sending
unit/transducer
AT HIGH
END
and
gage.
Break in sending unit/transducer Replace sending unit/transducer
lead.
and gage.
Internal
break
in
gage.
Replace
gage
and
sending
unit/transducer
Replace gage and
OBVIOUSLY INCORRECT Defective
gage mechanism. sending
unit/transducer
READING
.
Replace
gage and
_Incorrect
calibration.
sending
unit/transducer
15-20
Change8

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)