Cessna T188C - 15-28. Oil Pressure Gage; 15-31. Oil Temperature Gage; 15-33. Fuel Quantity Indicating Systems; Removal and Installation (Metal Tank)

MODEL 188 & T188 SERIES SERVICE MANUAL
15-28.
OIL PRESSURE GAGE.
to the engine should
be filled with
kerosene, especially
dur-
| 15-29. DESCRIPTION. The Stewart Warner Bourdon ing cold weather operation, to obtain immediate oil indica-
tube-type oil pressure gage is a direct-reading instrument, tion Rochester gages are electrically actuated and are not
operated by a pressure
pickup line connected
to the engine
adjustable.
main
oil gallery. The
oil pressure line
from the instrument
115-30.
TROUBLE
SHOOTING STEWART
WARNER
GAGE
TROUBLE
PROBABLE
CAUSE
REMEDY
GAGE DOES NOT REGISTER.
Pressure
line clogged.
Clean line.
Pressure line broken.
Repair or replace
damaged line.
Fractured
Bourdon tube.
Replace
instrument.
Gage pointer loose on staff. Replace instrument.
Damaged gage
movement.
Replace instrument.
GAGE POINTER FAILS
TO Foreign matter
in line.
Clean line.
RETURN TO ZERO.
Foreign
matter in Bourdon
Replace instrument.
tube.
Bourdon
tube stretched.
Replace instrument.
GAGE
DOES NOT
REGISTER
Faulty
mechanism.
Replace
instrument.
PROPERLY.
GAGE HAS ERRATIC OPERA-
Worn or bent movement.
Replace
instrument.
TION.
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.
Repair or replace
damaged
line.
15-31. OIL TEMPERATURE GAGE. 15-33. FUEL QUANTITY INDICATING SYSTEMS.
15-32. DESCRIPTION. On some
airplanes, the oil tempera- 15-34.
DESCRIPTION. The magnetic
type fuel quan-
ture
gage is a Bourdon
tube type pressure
instrument
tity
indicators are
used in conjunction
with a float-
connected by armored
capillary tubing
to a temperature
operated
variable-resistance
transmitter
in each
fuel
bulb
in the engine. The temperature bulb,
capillary tube cell.
The full position of float produced
a minimum
and gage are filled
with fluid and
sealed. Expansion
and resistance
through
the transmitter.
permitting maai-
contraction
of fluid in the
bulb with temperature
changes
mum current
flow through
the fuel quantity
indicator
operates the gage.
Checking capillary
tube for damage
and
and marmum pointer
deflection.
As fuel level
is
fittings for security
is the only
maintenance required.
Since
lowerd reitance
in the transmitter
is increased,
the tubes
inside diameter
is small, small
dents and kinks,
producing
a decreased
current flow through
the fuel
which would
be acceptable
in larger tubing, may
partially
quantity indicator
and a smaller
pointer deflection.
a
or completely
close
off the capillary,
making
the gage
inoperative.
Some
airplanes are equipped
with gages
that 15-35.
REMOVAL
AND INSTALLATION
(METAL
are electrically actuated and are not adjustable. Refer to TANK. )
Table I on page
15-12A/B when trouble shooting
the oil a. Drain
fuel as outlined in Section
12.
temperature gage.
15-10 Temporary Revision 2 - Oct 3/94