PIPER
COMANCHE
SERVICE
MANUAL
7C-65.
OU
ScreeD.
The
suction screeD located
in
the
left side
of
the
..,.me
sump should be cl
....
ed
at
each
oil
c:lwIie
to
remove any Kc:wnulation
of
sludge and
to
OltaDIiDe
for
meW
fi~
or
chips. If metal
particles
arc
found in the
&creal,
the
.,.me
liIould be
OltaDIiDed
for intcmal
datnqe.
Tbe
suCtIOn
screen
is
removed from the sump by removing the bex bead plug
..
the lower left side
of
the sump.
Cl
....
and
iDspeet the screen and
plket
and replKe the
poket
if
owr
compressed
or
daJnaaed.
7C-66. Oil
FU-
ElaDenL
&.
Tbe oil filter element should be rem.>ved after each fifty
boun
of
engine
opention;
this
is
Kcomplisbed
by
removiDs the lockwire from
the
bolt-bead
or
the
end
of
the filter bousiDI, looscniDg the
bolt,
and
remCNiDg
the
film
wembly
from
the
&CIaptet.
b. Before
discarding
the filter
demcl\t,
retIIOft
the
OUter
perforated paper
CDftr,
and using a
iii""
knife, cut thro
...
b the folds of the elemen,
at
both
eDdi, claK
to
the
metal caps. TheD, carefully unfold
'he
pleated elemen,
and
aamiDe
the
_",nal
Inpped
in the filter for evidence
of
in,ernal engine
clamage
such
as
chips or particles from
beariDp.
In new
or
newly ovcrIIaul.d
qiDes,
som.
small particles of m.ta1Iic
sbaviDp IIIiIht be
found; these
arc
gencrally
of
no coDlCqu.n
..
and
lilould
no,
be
contu..
with pameles
produced by
impactiDg, abrasioD
or
prcssnre. Evidence
of
internal engine
damage
fOURa
oJ} the oil fil.er
justifies further .xarniDation
to
determine the caUK.
c. After
the
element
has
been replac.d, tigbten the attaching
bol,
within
15
'0
18
foo, pounds
,orque.
Lockwir. the bol, through the loops
on
the side
of
th.
housiDI
.0
the drilled head of
'he
tbcrtnott&tic valve,
Be
sure the lockwin:
is
replaced
at
both
the
atw:binl
bol, head and the thermoscaoc oil
cooler
by-pus
valve.
7C-67.
Turbo
OU
Flow Check.
(Refer.o
Ficure 7C·17.) Should an indication
of
low turbo oil pressure or
flow
occur. the foUowiDI system
ch.cks
may be accomplished.
&.
To check oil pressure,
UK
the
following procedure,
I.
Insu.ll a pressure
ga
....
wi,h a
'""'Ie
of 0
'0
80 psi pressure in the pressure line to
.he
turbochargm
af,er the reduction check valve.
2.
Start
the engine and
wann
up
In
the usual manner until oil temperature
is
normal.
3.
Idle engine at 1000
RPM
and observe pressure gauge.
1,
should indicate a mmimum of
IS
pSI.
Run
engm.
at
2000
RPM
the pressure gauge should read a minimum
of
30 psi and a maxunum of
55
psi.
b. To
check turbo oil flow, use the
followi",
procedure, .
I.
Ascertain that the engin. oil sump
is
full
as
indicated on the dipstick.
2.
Start
the
enllne
and.
warm.
up m the usual manner until
oU
[cmpen.ture
is
normal.
3.
S,op
engin. and disconnect oil drain line, of the turbocharger
to
be checked.
at
the sump. ing
4.
Plug sump connection where drain line was disconnected.
S.
Install
test
line, approximately four feet long. on disconnected turbo
ou
drain line.
6.
Set
twO
clean
one
lailon capa.city containers below the englDC.
1. Allow the turbo oil drain
test
line
to
hang in one
canwner.
8
S.an
engine and idle
at
1000 RP!\I.
9. When oil flows from the
turbo
oil drain line into the container. qUickly direct the
all
flow
intO
the
empty
container
and
i!1'lmccUarciy
Start
riming
for
onc
mmutc.
10. When
one
minute
has passed, direct
the
oil flow
IntO
the
scavenger contalJlCT
and
nop
engtnc.
11.
Measure the all in the [est (onta.iner. It should be a minimum
or
0.4 quart.
12. Disconnect test line, remove plug irom
dr::un
line tee fitting and connect
~rbo
all
drain hne [0
tee
fitting
13
Test oil flow
of
the other turbocharger unit by
uSing
the same procedure.
2
H21
POWER
PLANT
ISSUED:
8118/72
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