Cessna T188C - Page 169

MODEL 188
& T188 SERIES
SERVICE
MANUAL
11-31. TROUBLE SHOOTING (Cont).
TROUBLE
PROBABLE
CAUSE
REMEDY
LOW OIL TEMPERATURE.
Defective oil
temperature gage Check
with another gage. If
or
temperature bulb.
reading is normal,
aircraft
gage
is defective.
If reading
is
similar
temperature
bulb
is defective. Replace defective
part/or parts.
Oil cooler
thermo-bypass
Replace valve.
valve defective or stuck
closed.
HIGH OIL TEMPERATURE. Oil cooler air passages clogged. Clean air passages.
Oil cooler oil passages clogged. Remove cooler and flush
thoroughly.
Vernatherm
control
valve damaged
Remove.
Clean
valve
and seat.
If
or
held open by solid
matter.
still inoperative,
replace.
Low oil supply. Replenish.
Oil viscosity too high. Drain and fill sump with proper
grade
and
quantity.
Prolonged
high speed operation
Hold ground
running above 1500
on the ground. rpm to a minimum.
Defective
oil temperature
gage.
Check with
another
gage.
If
second reading is normal, air-
craft gage
is defective.
Replace
gage.
Defective
oil temperature
bulb. Check
for correct oil pressure,
oil level and cylinder head tem-
perature. If they are correct,
check oil
temperature
gage
for
being defective;
if similar
reading
is observed,
bulb
is defective.
Replace bulb.
Oil
congealed
in cooler.
If
congealing
is suspected,
use
external heater or a heated
hangar to thaw the congealed
oil.
11-13