1991 LEXUS SC400 Service Repair Manual

tires navigation system deactivate airbag tyre pressure traction control climate settings

Page 2121 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION A fully pressurized, fully filtered lubrication system has been adopted f\ or this engine. OPERATION LU±2± LUBRICATION SYSTEM Description, Operation WhereEverybodyKnowsYourName$

Page 2122 of 4087

$LEXUS SC400 1991 Service Repair Manual DESCRIPTION A fully pressurized, fully filtered lubrication system has been adopted \ for this engine. OPERATION LU±2± LUBRICATION SYSTEM Description, Operation WhereEverybodyKnowsYourName$

Page 2123 of 4087

$LEXUS SC400 1991 Service Repair Manual A pressure feeding lubrication system has been adopted to supply oil to \ the moving parts of this engine. The lubrication system consists of an oil pan, oil pump, oil filter and other external p\ a$

A pressure feeding lubrication system has been adopted to supply oil to \
the moving parts of this engine. The
lubrication system consists of an oil pan, oil pump, oil filter and other external p\
arts which supply oil to the moving
parts in the engine block. The oil circuit is shown in the illustration at th\
e top of the previous page. Oil from the
oil pan is pumped up by the oil pump. After it passes through the oil fi\
lter, it is fed through the various oil holes
in the crankshaft and cylinder block. After passing through the cylinder b\
lock and performing its lubricating func-
tion, the oil is returned by gravity to the oil pan. A dipstick on the center\
left side of the cylinder block is provided
to check the oil level.
OIL PUMP The oil pump pumps up oil from the oil pan and sends it under pressure to t\
he various parts of the engine.
An oil strainer is mounted in front of the inlet to the oil pump. The oil \
pump itself is a trochoid type pump, inside
of which there is a drive rotor and a driven rotor. When the drive rotor rotates, the driven rotor rotates in the same
direction, and since the axis of the driven rotor shaft is different from the center of the driven rotor, the space
between the two rotors is changed as they rotate. Oil is drawn in when the space\
is wide and is discharged when
the space in narrow.
OIL PRESSURE REGULATOR At high engine speeds, the engine oil supplied by the oil pump exceeds the\
capacity of the engine to utilize
it. For that reason, the oil pressure regulator works to prevent an over\
supply of oil. During normal oil supply, a
coil spring and valve keep the bypass closed, but when too much oil is being \
fed, the pressure become extremely
high, overpowering the force of the spring and opening the valves. This allow\
s the excess oil to flow through
the valve and return to the oil pump inlet.
OIL FILTER The oil filter is a full flow type filter with a built±in paper filter e\
lement. Particles of metal from wear, airborne
dirt, carbon and other impurities can get into the oil during use and co\
uld cause accelerated wear or seizing if
allowed to circulate through the engine. The oil filter, integrated into the oil line, removes these impurities as the
oil passes through it. The filter is mounted outside the engine to simplify\
replacement of the filter element. A relief
valve is also included ahead of the filter element to relieve the high oil pr\
essure in case the filter element be-
comes clogged with impurities. The relief valve opens when the oil pressure o\
verpowers the force of the spring.
Oil passing through the relief valve by±passes the oil filter and flo\
ws directly into the main oil hole in the engine.
±
LUBRICATION SYSTEM PrecautionsLU±3
WhereEverybodyKnowsYourName

Page 2124 of 4087

LEXUS SC400 1991 Service Repair Manual
PREPARATION
SST (SPECIAL SERVICE TOOLS)
RECOMMENDED TOOLS
EQUIPMENT
Part NameNote
Oil pressure gauge
Precision straight edgeOil pump
Torque wrench
LUBRICANT
Item
Capacity
ClassificationItemLitersUS q

Page 2125 of 4087

LEXUS SC400 1991 Service Repair Manual
OIL PRESSURE CHECK
1. CHECK ENGINE OIL QUALITYCheck the oil for deterioration, presence of water, discoloring
or thinning.
If the quality is poor, replace the oil.
Oil grade: API grade SG, Energy±C

Page 2126 of 4087

LEXUS SC400 1991 Service Repair Manual
7. REINSTALL A/C COMPRESSOR(a) Install the A/C compressor with the through bolt, fourbolts and nut.
Torque:
Through bolt 26 N Vm (265 kgf Vcm, 19 ft Vlbf)
Bolt and nut 52 N Vm (530 kgf Vcm, 38 ft

Page 2127 of 4087

LEXUS SC400 1991 Service Repair Manual
REPLACEMENT OF ENGINE OIL
AND OIL FILTER
CAUTION:
wProlonged and repeated contact with mineral oil will
result in the removal of natural fats from the skin, leading
to dryness, irritation and dermat

Page 2128 of 4087

LEXUS SC400 1991 Service Repair Manual
(d) Lightly screw the oil filter into place, and tighten it untilthe gasket contacts the seat.
(e) Using SST, tighten it an additional 3/4 turn.
SST 09228±07500
3. FILL WITH ENGINE OIL (a) Clean

Load next 8 pages

Page: < prev 1-10 ... 2089-2096 2097-2104 2105-2112 2113-2120 2121-2128 2129-2136 2137-2144 2145-2152 2153-2160 ... 4088 next >

battery replacement apple carplay fuse battery capacity diagnostic menu check engine