•
",
PIPER
COMANCHE
SERVICE
MANUAL
a.
To remove the pressure screen, remove oil temperature electrical lead or the temperature bulb and the
cap screws securing the housing. Note the location
of
the screws as the round mlister head screw,
if
installed,
must be returned to upper right comer
of
the housing.
If
the mlister head screw is not reinstalled in the same
hole from which it was removed, it
is
possible to crack the mounting flange
of
the vacuum pump.
b. With the housing and screen removed, clean and inspect both items, check the mating surface
of
the
housing and accessory case
of
gasket particles.
c. Insert the screw into the housing so that the screw fits flush with the housing base. Using a new
gasket, secure the housing to its mounting pad and torque cap screws to 75 inch pounds.
d. The suction screen
is
removed from the sump by removing the hex head plug at the lower aft part
of
the sump. Clean and inspect the screen and gasket, replace the gasket
if
over compressed
or
damaged. Insert
the screen fully into the sump, install gasket and plug. Safety the plug.
7-56.
Oil Cooler.
a.
When conducting a routine engine inspection, the oil cooler(s), lines and fillings should be checked
for the following:
I.
Oil cooler line attachments should be examined to be certain that all are tight and there
is
no
indication
of
cross-threading. (See c, below. for oil line torque.)
2.
Oil lines must have adequate clearance and be properly aligned.
3.
Oil line supports should be tight, properly positioned and
if
worn should be replaced.
4.
Oil cooler should be checked for leakage or distorted cells.
5. Cooling rms should be clean and undamaged.
b. During each engine overhaul, at indication
of
high oil temperatures or during a 500 hour inspection,
the oil cooler should be removed, cleaned and checked for damaged fins and cells. When replacing the cooler,
properly align and do not over tighten the mounting bolts so that the cooler would be damaged. While the oil
cooler is removed, the oil lines should be disconnected and flushed.
c.
If
it is found that oil
is
leaking around the line compression nuts, check that the nuts are tightened to
125 inch pound wet torque or the nut may be backed off, retightened finger tight, plus a
3/4 tum. Do not over
torque.
d.
Should
oil continue to leak, it may be necessary to
replace
the seal rings.
Also
remove the
compression nuts and inspect the line ends
in
the area
of
the swaged ferrules for collapsed tubing. This
condition may
be
observed by looking into the tubing ends. Should the tubing show indications that it
is
collapsed and new seal rings and proper torque does not stop leakage, the oil lines should be replaced. Also
inspect the surfaces
of
the mating fittings for damage.
Revised:
8115198
2B19
POWER
PLANT
PA-24-180
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