Lubrication System; Oil Pressure Relief Valve; Oil Screens - Piper PA-24 Comanche Service Manual

PIPER COMANCHE SERViCE MANUAL
7-52. Inst11lacion Of Sp.k Plup. Before
iftstallinc spm
plup. ascmaiD that the thrads within tile
cylinder are clean and not dunlfed.
a. Apply anti-seize compound sparinliY on the threads and iDaall psKct and spark plup. Torque 360
to 4020 inch pounds.
CAllTJON
Make certain the
deep
socket is properly
seated
on the spark plUl
hexacon
u
clamaae to
the
plUl could
result if
the wrench is cocked to
one side when pressure is applied.
b. Carefully insert the terminal insulator in the spark plUl and tithten the couplin'IlUt.
7-53.
Lubricacion Systelil.
7-54. Oil
Prcuure
Relief
Valve. Subject mpnes may be
equipped
with either
an
adjusuble or
non-adjustable oil pressure relief valve. A brief description of
both
types foUows:
a. NOll-adjustable Oil Preuun: Relief Va1ve· The valw is not adjlllt&ble: however. the pressure can
be
conaolled by the addition of a maximum of three
STD~25
washen under the cap to increase pressure or
the use of a spacer (Lycominl PIN 73629 or 73630) to deereue pfCSIW'C. Panicles of meaJ or other foreign
matter lodged between the ball &nd scat
will
result in a drop in oil prasure. It
is
advisable. therefore. to
disassemble. inspect. and
dean
the valve if excessive preaure fluCN&tions are
ROted.
The oil preSlUre relief
valve
is
not to be mistaken for the oil cooler by·pus valve. whote function is
to
permit pressure oil to
by-pus the oil cooler in case of an obm'\lction.
b. Adjustable Oil Pressure Relief Valve - The adjustable oil prasure relief valve enables the operator
to maintain en,ine oil prasure within the specifacd limits (refer to the ape manufacturer's &ppropriate
manllll). The valve is loc&ted &bove and to the rear of No.3 cylinder. If the pressure under normal
operatins conditions should consistently exceed 90 psi.• or run less than 60 psi.. adjust the valve as follows:
With the engine thorouply warmed up and runninl lot &maximum of 2200 RPM. observe the reading
on [he oil pressure lauge. If the pressure is above 90 psi. StOP eqine.loosen the adjustin,locknut; &nd back
off the adjustina scrcw one or
twO
fun turns. Tiabten locknut and
retest.
If prcuure is tOO low, tum
&djusting screw funher into the rdief valve plua. thereby iDcreuinl the tension on the relief valve spnng.
When the valve has been satisfactorily adjusted. tilhten the 10c1u:aut and lock wire the crown nut to the
drilled eu projecting from the valve mountlftl
boSi.
7·55. Oil Screens. The oil screens are the pressure screen. located
in
a dome shaped housing. above and
between [he magncros and the suction screen located in the lower Ut section of the sump. These screens
should be cleaned at each oil chanae to remove any accumulation of sludp and to e:tamine for meui filings
or chips.
If
meral particles are found in the oil screens. the eftlPne should be examined for internal da.rnage.
POWER PLANT
ISSUED: 8/18/72
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