Cessna 177 SERIES Service Manual

15-46.
MANIFOLD PRESSURE
GAGE.
15-47.
DESCRIPTION.
The
manifold
pressure
gage
is a barometric
instrument
which
indicates
absolute
pressure
in the
intake
manifold
in inches
of
mercury.
15-48.
TROUBLE
SHOOTING.
TROUBLE
PROBABLE
CAUSE
REMEDY
EXCESSIVE
ERROR
AT
Pointer
shifted.
Replace
instrument.
EXISTING
BAROMETRIC
PRESSURE.
Leak
in vacuum
bellows.
Replace
instrument.
Loose
pointer.
Replace
instrument.
Leak
in pressure
line.
Test line
and
connections
for
leaks.
Repair
or replace
damaged
line,
tighten
connections.
Condensate
or fuel
in line.
Check
line
for obstructions.
Blow
out line.
JERKY
MOVEMENT
OF
Excessive
internal
friction.
Replace
instrument.
POINTER.
Rocker shaft screws
tight. Replace
instrument.
Link
springs too
tight.
Replace instrument.
Dirty
pivot bearings.
Replace instrument.
Defective
mechanism.
Replace
instrument.
Leak
in pressure
line.
Test
line and
connections
for
leaks. Repair
or replace
damaged
line,
tighten
connec-
tions.
SLUGGISH
OPERATION
Foreign
matter
in line.
Check
line for
obstructions.
OF POINTER.
Blow
out line.
Damping
needle
dirty.
Replace
instrument.
Leak
in pressure
line.
Test line
and
connections
for
leaks.
Repair or
replace
damaged
line,
tighten
connec-
tions.
EXCESSIVE
POINTER
Tight
rocker
pivot
bearings.
Replace
instrument.
VIBRATION.
Excessive
vibration.
Check
mounting
screws.
Tighten
mounting
screws.
IMPROPER
CALIBRATION.
Faulty mechanism.
Replace
instrument.
Change 2 15-19

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)