Piper Comanche PA-24 Service Manual page 603

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