Piper PA-24 Comanche Service Manual page 428

PIPER COMANCHE SERVICE MANUAL
7B-54. OU Screens. The oil SCreclll ue me preslUft screca, loeucd in a dome shaped hOllSiDg, above 1ftd
between the mqnuos and the suction
screen
locaeed in the afe section of the sump. Tbese
screens
should
be clCU'led
ae
eacb oil cbanp to remove any aCCWllulation of sludle and
to
examine for metal fJ.1.inp or
chips. If mew pattides ue fOWld in the oil
ICZftIll.
the eapte should be examined for ineernal
ciamac
c .
a.
To
remove
the prasure
screm,
remove oil
mnpcn.mn
elcct::ricallad or the
tempcn.aue
bulb and
the cap
screws
seCllriDl the housiDl. Note dle
locadon
of the
screws u
che round fillister hca.cl screw.
if
insulled. mu.sc be mumed co upper ri,ht comer of the housiDt. If the flllilur
bad
ICtew
is not rewulled
in the
same
hole from which it
was remowcl, ie
is possible to cnck the
moun=-
flante of
the
vacuum
pump.
b. With the housinl aDd
SCIft1l
remowed. c1eul andinlpCu both irea, chcckthe
matinI
surface of
the housinr and accasory cue for
pee
partida.
c. InKft me
screw inca the bousinllO thae the screw fia flush with the boutin, base.
Usinr
a new
gasket. secure the houlinl to ia mounc:m, pad and torque cap
screws
to 7S inch poullds.
d. The suction screen is mnoved from the sump by removm, the hex had plu,
at
the lower aft part
of the sump. Clean and inspect the screen and psket. rcplac:c tbe ,uku
if
over compressed or damaged.
Insert the scrccn fully ineo the sump. insc&ll
fukft
and piUl' Suny
the piUl'
iB·55.
ou
Cooler.
a. When conducUfti a routine enJine inspection, the oil coolcr(s).lincs and fitciftp should be checked
for the following:
1.
Oil cooler line attaehmcna sbould be txamined to be certain that all
1ft
tithe and thete is no
indicuion "f aouthrcadinl. (Sec C for oil line torque.)
2. Oillina muse have aclequarc c1anncc and be properly
a1itncd.
3.
Oil line supportS should be tithe, properly positioned and if
wom should be replaced.
4. OU cooler should be checked for leakap or distorted cells.
S. Cooling fUll should be clean and undamqed.
b. Durinl each engine overhaul,
at
indications of hiah oil rempCQcuI'CS or during a
sao
hour
inspection, the oil cooler should be
removed, cleaned and checked for damqed fUll and cells, When
replacing the cooler, properly alip and do not over tighten the mounting bolts so thae the cooler would be
dam.lfecl. 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 nua. check that the nuts are tightened
to
12'
inch pound wee torque or the nue may be backed off, migbtened finger right. plus a 3/4 rum, Do
not over torque.
d. Should oil continue to leak, ie may be necessary co replace the seal rings. Also remove the
compression nua &tid inspece the line ends in the uca of the SWilled females for collapsed wbine. This
condition may be observed by lookiftl
intO
the tubing ends. Should the cubilll show indications that it is
collapsed and new seal rinp and proper torque docs nee HOp leak.lle, the oil lines should be replaced. Also
inspece the surfaces of the mating fietings for dam.lle.
18·56. Recommendations For Chanlinl Oil. (Ref. Lye. latest
5.1.
No.
1014 .)
a. If an additive oil is used in a new enline, or a newl)" overilawed engine, high oil consumption
might possibly be experienced, The anti·friction additives of some of these oils will rcurd the break-ill of
the piston ring! and cylinder walls. This condition is cuily corrected by the use of straight mineral oil until
normal oil consumption is obtained. thcn change to the additive type.
POWER PLANT
REVISED: 4/10/81
2F24
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