PIPER
COMANCHE
SERVICE
MANUAL
Th.
oil pressure
rut
...
Iem ...... located
on
die
accessory
housin
••
is
provided as a means to
rut
..
any _
solid particles
that
may have
pused
through
die Netion
screen in
the
sump.
Af
...
beina filtered through
..
the
pressure
rut
...
the
oil
is
fed througb a drilled
passqe.o
the
oil
preawe
relief valv •• located in
die
upper
right
side
of
th
.•
c:nnkcue
forward
of
the
aeceaory
housin
•.
This relief valve regulates
the
......
e oil pressure by
aIIo"",,,
excess
oil
to
retIIm
to
the
Rlmp. while die
balanc.
of
the
presNre
oil
is
fed
to
die
main oil
pIlery
in
the
righ.
half
of
the
c:nnkcase. Residual oil
is
retIImed
by
sraviry
to
the
Nmp
where. af
...
passing through
die
Netion
scr
......
i.
is
again circulated
through
the
.".me.
The
turboch
.....
s
are
lubricated
I!Y
!npne
oil which
is
Rlpplied
'0
the
turbo
oil
pIlery
by
lines
connected
to
die
""line
accessory
housi",.
IncOTJlOrated
in
tbe
oil
Npply
line is • pressure regulator
poppet
valve.
The
...
of
a resuicted fitting reduces
.".m.
oil pressure
to
30-35 psi prOSltlre required
ior
th.
rurt>ochargetS. Oil
is
scav
....
ed
from die turbocharg
..
sump
and
returned to
the
...
ine sump by a scavencer
pump installed
on
the
hydraulic
pump
drive pad
of
th."""e
acCOSlOry
housing.
7C·3.
TroublabootiDa.
Troubles peculiar
to
the pow
..
plant
arc
listed in Table
VllC·ll
in die back
of
thi>
section. along with their probable
causes and
suaested
remedies. When
rroubleshou""I
.ngines. ground
the
magn.to
primary circuit before performins any checks on
the
ipUtion system.
7C
.... Engine CowliDg.
7C·l.
Removal
Of
Engine Cowling.
a.
Ascerwn
that
die
master
switch and
"'""'etO
swi.ches
arc
in die
off
position.
b Release the three cowl fasteners on each side of the engine comparancnt.
c.
Remove
atw:hing
screws
from die
tOP
cowl
at
die ruewall. _
d.
Remove attaching
screws
from
the
nose section parting sunaces.
..
c.
Remove tile
tWO
amcning nuts. washers and
screws
5ecuring the top cowl channels to firewall.
f.
Lift the
tOP
cowl from dI
••
ngin.
assembly.
g.
DlSCor.ncct nose gear door
acmati",
rods.
h.
Dj~onncct
cowl flap (onttOi cables.
I.
DISconnect gear
door
frame ch&nncls from firewall Uld a.cuchmcnt
SU:lpS
from
tubular
structure
by
removing screws.
J.
DiSConnect drain lines from
bottom
cowl.
k. Remove
bottom
cowl by removing screws securing
it
to
tbe
firewall.
7C-O.
Cleaninl.
Inlp.ction
And Repair Of Engin. Cowlinl.
1.
Crean cowling
With
a.
suitable cleaning solvent and wipe dry
With
a.
clean
doth.
b.
Inspect cowling for dents. cracks. loose rivets. eiongaccd holes and damaged or missing
futcncn
c.
RepaIr all deiects to prevent
funhcr
damage. Fiberglass repair procedute'S may be a.ccomplished
according to Fibcrgla.ss Repair!. SectIon IV.
2
Gl0
POWER
PLANT
ISSUED:
8/18172
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