Toyota 4A-F Repair Manual page 261

A pr1!ssure feeding lubrication .ystem has been
PI'\.
IIiOpled sYpply oil
10
w!ll el l oil 10
"",ine. The lubricelion .ystem consisl5 of an oil
o� pump, oil fillet" and other elilemal parIS
IWppiy Ihe mo..mg parts in lhe engine
block, The oil circuit
"top prfl'lious
01 1M
IUIlPfId
up by the oil pump.
nough the 011 lilter. it is led through the ... .
its
oil holM in the crankshaft and cylinder
oily 10
passing through the cylinder block and performing
lubricating function, the oil is returned by gre­
lhe oil pan. A dip
pump body is pro ... 1ded
OIL PUMP
.... .
"·F
oil pump pumps up oit from the oil pan .nd
T
inlet
�s it under pressure to the ... arious �rts of the
engine. An 011 strain.r
and
to the oil
pump.
,01l11S
trochoid type pump. Inaide of wh>ch is a
a d r i ... en rotor. When
from
tile dri ... en rotor
ween
,ince the .lIs of the dri ... . n rOlor shah is dilfe<1111
lhe c.nte!'" ol lhe drl ... en rolor. the space bel-
the two rOlors is changed 15 they
is drawn in when the splICe is wide and is dis·
charged when Ihe space In
'.·GE
The oil pump pumps. up oil from the oil pan and
WIlds it under pl.SlU'"
engine. An oil Itreiner is mounted in front of th.
e
net to Ihe oil pump. The oil pump ilse11 is an inler·
nal gear pump. which
g ar inside the pump body. When the dri .... gear
rotates, the dri\lflll gear rotates in the same dir�.
tion. When both gears rot8te, the space betwH1l
Ihe two geers changas Oil is drawn In whim this
-Mde . •
spac. is nd is discharglld wh.n IhI space is
nanow.
OIL PRESSURE REQULATOR
to tenon.
AI high IInglne speeds. the IIng,"e all IWPphed
or
by the oil pump uellll d s
•
utiliz. it. for tNI
tor works to
.... eol .
C
nonnal oit suppty,
'orc.
bYP& S $ dosed. but when too much oit is being
the pressure become II(t.el"flll l y high, overpower.
ing Ihe of the spring and Opllning the ... al ...
This allow. Ih. IIXcess oil to flow through thll
... at ... e and r.lurn to the oil pan.
Ihe mo ... ing pan.
10
is the
page.
shown in iUulllllion el
Oil lrom th. oil pan is
Alter It �sses
block.
stick a'
on the side
to check the oil le
is
dri
mounted in front of the
the
Th. orl pump Itsell
dri ... e rotor rotat
In the same direction. end
rotate.
narrow.
the
10 ... iMious parts of the
USIS e
a dri ... ge.r and dri
the .... .. engine
.
capacity
0 1 1
thll oil prllSSUfe regula·
o"'e<supply of oil. Curing
OI
l ,prIng and ... alve keep the
01
OIL FILTER
PIPIt
Ihis
The oil fille< is a lull ftow lyPl! loiter w.th
in
wear, eirborn dirt, c&rbon .nd other Imputilills can
QClt in
eted Wll8l" or .iIIling il allowed
rious
Ihll engine. Thll oit filter, inttgf1lted inlo the o� line.
remo ... es lhese lmputitin
it. The filler is mounted outside the III1gltlll t o
After
simplify reptac.mllnt o f the filter IlllIment. A relief
valve IS also inctudlld ahead
... eI.
,elie ... e the high oil prelliU'1I
the 0,1
mIInt becomes clogged with Imporil,"
...al ... e DOIns
forc. of the
... . 1 ... . bypasses thll oit lill,r .nd flows directly into
the m.1Il oil hole in the lIIl9 i ne
Is
a
... e rotor
.. ,
Oil
... en
11Id,
IIS.
IhI
filler element. Parlicles
ojl during UN and couid csuse ftCclI4er·
IS
whItn
the oil prenur' o ...
spring. Oil pUling through
bultt­
II
mel.l from
01
Ci,culllt. through
10
Ihe oil paSSM Ihrough
01
i n
The relief
Ihll filter .Iement t o
.. .
CIS' the 'ilte< ele­
Ihe
pow.rs Ihe
reliel