Piper PA-24 Comanche Service Manual page 387

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PIPER COMANCHE SERVICE MANUAL
7A·87.
Recommendations For Chanlinl Oil.
(Ref. latest
Lye.
5.1,
~o.
1014 ,)
a. If an additive oil is I.IJCd
in ~
new enJinc. or a newly overhauled enp1c. hiJh oil consumption
might poSlibly be cxperieru:cd. The anti-friction additives of some of these oils will rewd the break-in of
the piston
riDes
and cylinciet walls. This condition is euily conee:ted by the \lse of smilht minen! oil until
normai oil consumpaon is obWoed. then chaop
to
the additive
type.
b. In
enama
tbu have been operatinl on stniIht mincn.l oil for more than 100 houn. a change to
deteraCDt oil should be nwle with • dqrcc of caution. the cleanm, action of • detCfJCftt oil will tend to
loolCn sludJe deposlts and
caUIC
pluFd oil pUS&JCS. In
fact.
if an CftIine hu been operatinl on straiIbt
mincra1 oil. and is known to be in exceuivcly dirty condition. the switch to
dcterpnt
oil should be deferred
until after the CftJine is overhauled.
c. When
chI.fttinI
from
saailht
mineral oil to deterFnt oil. the foUowm, precautionary steps should
be taken:
1. Do not
add
detergent oil to sm.ilht mincm oil. Drain the mailht mincn1 oil from the engine
and
fill
with detCfJCDt oil.
2. Do not opcr&te the engine
lancer
than five hours before the fJrSt oil change.
3. Check
aU
oil
~ms for
evidence of sludp
or
pluging, Chaar: oil
every
ten
houn if
sludge
conditions are evident. Resume nonnal oll drain periods after sJudie conditions improve.
CAUTION
The terms "dcceqcnt", "additive" and "compounded" used herein
ate
intended to refer to a cIa.u of avWion enJine lubricating oils to which
certain substances have been added
to
improve them for aircraft use.
These terms do not refer to
such
mueri&ls commonly known as "tOP
cyliJlder lubricant". "dopes", "carbon remover" whlch are sometimes
added to fuel or oil. These products may caUK
dam.
to the engine
and their presence
in
an e"line will YOld
me
owner's warranty. Under no
ctfcumJQllces should automCltive oil be u.scd. The use of automotive
lubricantS in Lycominl engina is
sufficiczn lfOunds for
rejection
of
any
wuranty claims.
POWER PLANT
ISSUED: 8118/72
2
E7