Cessna 150M - Full-Flow Oil Filter; Filter Element Removal and Installation

11-28. TROUBLE SHOOTING (Cant).
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.
HIGH OIL TEMPERATURE.
Excessive rate of climb.
Avoid low airspeed.
Lean fuel-air mixture.
Avoid excessive lean mixture
operation.
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
Dirty or diluted oil.
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, aircraft gage
is defective. Replace gage.
Defective oil temperature bulb.
Check for correct oil pressure, oil
11-29. FULL-FLOW OIL FILTER. An ex-
ternal oil filter may be installed on the engine. The
filter and filter adapter replaces the internal oil
pressure screen. Provisions are provided in the
oil filter adapter cover for the oil temperature bulb.
The filter adapter incorporates a bypass valve. If
the filter element should become clogged, the bypass
valve will open, allowing pressure oil to flow to the
engine oil passages.
11-30. FILTER ELEMENT REMOVAL AND INSTAL-
LA TION. (See figure 11-4.)
NOTE
New filter element kits are available from
the Cessna Service Parts Center.
a. Remove engine cowling as necessary for access.
b. Remove both safety wires from filter can and
unscrew hollow stud to detach filter assembly from
adapter as a unit. Remove from aircraft discarding
upper gasket. Oil will drain from filter assembly
as assembly is removed from adapter.
c. Press downward on hollow stud to remove from
11-14
level and cylinder head tempera-
ture.
If they are correct, check
oil temperature gage for being de-
fective; if similar reading is ob-
served, bulb is defective. Replace
bulb.
filter element and can. Discard metal gasket.
d. Lift lid from can, and discard lower gasket.
e. Pull filter element from can.
NOTE
Before discarding removed filter element,
remove the outer perforated paper cover;
using a sharp knife, cut through the folds
of the filter element at both ends, close to
the metal caps. Then carefully unfold the
pleated element and examine the material
trapped in the filter element for evidence
of internal engine damage such as chips or
particles from bearings. In new or newly
overhauled engines, some small particles
or metallic shavings might be found, these
are generally of no consequence and should
not be confused with particles produced by
impacting, abraSion, or pressure. Evidence
of internal engine damage found in the oil
filter element justifies further examination
to determine the cause,
f. Wash lid, hollow stud and can in cleaning sol-
vent and dry with compressed air.