Oil Filter Element; Turbo Oil Flow Check - Piper PA-24 Comanche Service Manual

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PIPER COMANCHE SERVICE MANUAL
7C-65.
Oil
SCNCIl. The suction saftn located in the left side of the
en,iDe
sump should be cleaned at
each
oil chantc to remove any accumulation of sludle and to Qamine for metal
fittinls
or chips. If meu.l
pU'ticles are found i.D me screen. the eJIIiDe should be examiDed
for iDtema1
damap.
The suction
screeD
is
removed from the sump by removiDi the hex had plu,
at
the lower left side of the sump. Clan and
inspect the screen and
psket
and replace the .....ce
if
OWl'
compmled or damlpd.
7C-66.
Oil
Fiker
I_au.
a.
The oil falter element should be removed &her each
fifty
hoWl of enliDe operation; this is
accomplished by removiDJ the lockwiR
from
the bolt-hcad at tile end of the futer bousm,. looscninl the
bolt. and remOYinl the
fUm'
IIIImbly from the adapcer.
b. Before
diJc:ardiaI
the
filter dC1llCftt. rc1IIOve the oueer pcrforami paper cover. and usiDi a
sb&rJl
knife. CUt
throqh
the folds of the element at both ends, close to the metal caps. Then. c:arcfully unfold the
pleated element and eumine the material trapped in the flltu for evide.ace of internal eftIU\e c:1a.m.qe
such
II
chips or particles from bcariDp. In
new
or llcwly overhauled
CDliDa.
some small particles of metallic
wviDp
milht
be
found; these arc pncrally of
DO
coascquencc
&Del should not be confused with
panicles
produced by imp&C'tiDJ, abraion or pressure. Evidence of iDtcnl&1 eapae
damafe
found in the oil filtet
juRifics further elWlWwion
to
determine the cause.
c. After the element
has
been
replaced.
titbttn the atudlin, bolt within 15 to 18 foot pounds
torque. Lockwire the bolt
tbrouJb
the loops on the side of the housint to the drilled head of the
thermostatic valve.
Be sure the lockwire is replaced at both the attaehiq bolt head and the thermostatic oil
cooler by-pus valve.
7C-67. Turbo
Oil
Flow Check. (Refer to Fipre 7C·17.) Should an indication of low turbo oil pressutc or
flow eeeur, the foUowm, system checks may be accomplished.
a. To check oil pressure.
11K
the foUowi. . procedure:
1. InsWl a pressure
.'ute
with a raqe of 0 to 80 psi pressure in the pressure line to the
turbocharJm alter the redue:tiOft check valve.
Z.
Start the enpne and warm up in the \lSU&l manner UfttU oil temperature is
normal.
3.
Idle eftlinc at 1000 RPM and observe pressure PUF. It should indicate a minimum of 15 psi.
Run engine al ZOOO
RP~
the pressure laUJC should rac:l a minimum of 30 psi and a nwumum of 5' psi.
b. To cheek turbo oil flow,
UK
the foUowiDi procedlUe:
1. Asccruin that the enrine oil sump is full as indicated on the dipstick.
2. Start the ensine and warm up in the usual lIWlner until oil temperature is normal.
3. StOP enpte and dixonnea: oil drain UDe. of the eurbochU'let to be checked.
It
the sump. ing.
.... Plug Nmp connection where drain line wu disconnected.
5. Install test line. approximalely four feet IOIll. on discoDnea:ed turbo oil drain line.
6. Set
twO
clean one .&I1oncapacity containm below the eftliDe.
7. Allow the turbo oil drain test line to hane in one coftwner.
8. Start engine and idle
at
1000 RPM.
9. When oil flows from the turbo oil drain line into the container. qUickly direct the oil flow into
the empty container and immediately start timiD, for one minute.
10. When one minute has passed. direct the oil flow into the scavencer container and StOP engine.
11. Measure the oil in the test container. It should be a minimum oi 0.4 quart.
12. Disconnect test line. remove plUJ irom
dram
line tee fitting and connect
~rbo
011
drain line to
tee fitting.
13. Test oil flow of the other turbocharger unit by using the same procedure.
POWER PlANT
ISSUED: 8/1&n2
2
H21