1991 LEXUS SC300 oil pressure

SERVICE SPECIFICATIONS
SERVICE DATA
Oil pressureat idle speed29 kPa (0.3 kgf/cm, 4.3 psi) or more
at 3,000 rpm 294±539 kPa
(3.0±5.5 kgf/cm, 43±78 psi)
Oil pumpTip clearanceSTD0.310±0.490 mm0.0122±0.0193 in.
Limit 0.53 mm0.0209 in.
Body clearanceSTD 0.100±0.175 mm0.0039±0.0069 in.
Limit 0.20 mm0.0079 in.
Rotor clearanceSTD 0.030±0.090 mm0.0012±0.0035 in.
Limit0.12 mm0.0047 in.
TORQUE SPECIFICATIONS
Part tightenedN mkgf cmftVlbf
A/C compressor X Cylinder blockThrough bolt2626519
Bolt and nut 52530 38
Oil pressure switch X Cylinder
block14150 11
Oil drain plug X No.2 oil pan45450 33
Oil pump body cover X Oil pump
body10105 8
Plug X Oil pump body49500 36
Oil pump X Cylinder block21210 15
No.1 oil pan X Cylinder block12 mm head bolt21210 15
14 mm head bolt39400 29
Oil pan baffle plate X No.1 oil pan8.8 90 78 in.
Vlbf
Oil strainer X No.1 oil pan8.8 90 78 in. Vlbf
No.2 oil pan X No.1 oil pan8.8 90 78 in. Vlbf
Oil level sensor X No.1 oil pan5.4 5548 in. Vlbf
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LUBRICATION SYSTEM Service SpecificationsLU±19
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SERVICE SPECIFICATIONS
SERVICE DATA
Oil pressureat idling29 kPa (0.3 kgf/cm2, 4.3 psi) or more
at 3,000 rpm 294±588 kPa
(3.0±6.0 kgf/cm2, 43±85 psi)
Oil pumpTip clearanceSTD0.110±0.240 mm0.0043±0.0094 in.
Limit 0.35 mm0.0138 in.
Side clearanceSTD 0.030±0.090 mm0.0012±0.0035 in.
Limit 0.15 mm0.0059 in.
Body clearanceSTD 0.100±0.175 mm0.0039±0.0069 in.
Limit0.30 mm0.0118 in.
TORQUE SPECIFICATIONS
Part tightenedNVmkgf Vcmft Vlbf
Oil oumo body cover X Oil pump body101058
Oil pump X Cylinder block12 mm head 16160 12
14 mm head 30310 22
Engine speed sensor X Oil pump6.465 56 in. Vlbf
Oil filter bracket X Oil pump18185 13
Oil strainer X Oil pump7.880 69 in. Vlbf
Oil strainer X Cylinder block7.880 69 in. Vlbf
No.2 oil pan X Cylinder block10 mm head 7.880 69 in. Vlbf
12 mm head 18185 13
Oil pan baffle plate X No.1 oil pan7.880 69 in. Vlbf
No.2 oil pan X No.1 oil pan7.880 69 in. Vlbf
No.2 oil pan X Cylinder block7.880 69 in. Vlbf
Oil level sensor X No.1 oil pan5.45548 in. Vlbf
LU±20±
LUBRICATION SYSTEM Service Specifications
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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.
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LUBRICATION SYSTEM PrecautionsLU±3
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PREPARATION
SST (SPECIAL SERVICE TOOLS)
RECOMMENDED TOOLS
EQUIPMENT
Part NameNote
Oil pressure gauge
Precision straight edgeOil pump
Torque wrench
LUBRICANT
Item
Capacity
ClassificationItemLitersUS qtslmp. qtsClassification
Engine oilAPI grade SG, Energy±Conserving II
Dry fill606353multigrade. Recommended viscosity is
Drain and refill6.06.35.3gy
as shown, with SAE 5W±30 being the
w/ Oil filter change 4.85.14.2preferred engine oil.
w/o Oil filter change4.54.85.3
g
SSM (SPECIAL SERVICE MATERIALS)
Part NamePart No.Use etc.
Seal packing or equivalent08826±00080Oil pump, Oil pan
Adhesive 1344,
Three bond 1344,08833±00080Oil pressure switch
Loctite 242 or equivalent
LU±4±
LUBRICATION SYSTEM System Circuit, Operation
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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±Conserving II multigrade.
Recommended viscosity is as shown, with SAE 5W±30 being
the preferred engine oil.
2. CHECK ENGINE OIL LEVELThe oil level should be between the ºLº and ºFº marks on the
dipstick.
If low, check for the leakage and add oil up to ºFº mark.
3. REMOVE ENGINE UNDER COVER
4. REMOVE DRIVE BELT Loosen the drive belt tension by turning the drive belt tension-
er clockwise, and remove the drive belt.
5. DISCONNECT A/C COMPRESSOR WITHOUT DISCONNECTING HOSES
(a) Disconnect the compressor connector.
(b) Remove the four mounting bolts and nut.
(c) R e m o v e t h e t h r ought bolt, and disconnect the
compressor from the engine.
HINT: Put aside the compressor, and suspend it.
6. REMOVE OIL PRESSURE SWITCH, AND INSTALL OIL PRESSURE GAUGE
(a) Disconnect the oil pressure switch connector.
(b) Using SST, remove the oil pressure switch.SST 09816±30010
(c) Install an oil pressure gauge.
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LUBRICATION SYSTEM Oil pressure CheckLU±5
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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 Vlbf)
(b) Connect the compressor connector.
8. REINSTALL DRIVE BELT Install the drive belt by turning the drive belt tensioner clock-
wise.
9. WARM UP ENGINE Allow the engine to warm up to normal operating
temperature.
10. CHECK OIL PRESSURE
Oil pressure:
At idle speed 29 kPa (0.3 kgf/cm
, 4.3 psi)
or more
At 3,000 rpm 294±539 kPa (3.0±5.5 kgf/cm
, 78 psi)
11. REMOVE DRIVE BELT (See step 4)
12. DISCONNECT A/C COMPRESSOR FROM ENGINE
(See step 5)
13. REMOVE OIL PRESSURE GAUGE AND REINSTALL OIL PRESSURE SWITCH
(a) Remove an oil pressure gauge.
(b) A p p ly a dhesive to two or three threads of the oil
pressure switch.
Adhesive: Part No. 08833±00080, THREE BOND 1344,
LOCTITE 242 or equivalent
(c) Using SST, install the oil pressure switch.
SST 09816±30010
Torque: 14 NVm (150 kgf Vcm, 11 ft Vlbf)
(d) Connect the compressor connector.
14. REINSTALL A/C COMPRESSOR (See step 7)
15. REINSTALL DRIVE BELT (See step 8)
16. START ENGINE AND CHECK FOR LEAKS
17. REINSTALL ENGINE UNDER COVER
LU±6
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LUBRICATION SYSTEM Oil pressure Check
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12. REMOVE OIL STRAINERRemove the two bolts, two nuts, oil strainer and gasket.
13. REMOVE OIL FILTER BRACKET (a) Disconnect the oil pressure switch connector.
(b) Remove the two bo lts, stud bolt, the filter bracket and oil
filter assembly.
(c) Remove the gasket from the filter bracket.
14. REMOVE ENGINE SPEED SENSOR (a) Disconnect the speed sensor connector.
(b) Remove the bolt and speed sensor.
15. REMOVE OIL PUMP (a) Remove the eight mounting bolts.
(b) Remove the oil pump by prying the portions between the
cylinder block and oil pump with a screwdriver.
NOTICE: Be careful not to damage the contact surfaces
of the cylinder block and oil pump.
(c) Remove the O±ring from the cylinder block.
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LUBRICATION SYSTEM Oil PumpLU±11
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(e) Install the oil pump with the eight bolts.
Torque:12 mm head 16 N Vm (160 kgf Vcm, 12 ft Vlbf)
14 mm head 30 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Each bolt length is indicated in the illustration.
Bolt length:
A 50 mm (1.97 in.) for 12 mm head
B 106 mm (4.17 in.) for 12 mm head
C 30 mm (1.18 in.) for 12 mm head
D 40 mm (1.57 in.) for 14 mm head
2. INSTALL ENGINE SPEED SENSOR (a) Install the speed sensor with the bolt.
Torque: 6.4 N Vm (65 kgf Vcm, 56 in. Vlbf)
(b) Connect the speed sensor connector.
3. INSTALL OIL FILTER BRACKET (a) Place a new gasket in position on the oil filter bracket.
(b) Install the oil filter bracket with the two bolts and studbolt.
Torque: 18 N Vm (185 kgf Vcm, 13 ft Vlbf)
(c) Connect the oil pressure switch connector.
4. INSTALL OIL STRAINER Install a new gasket and the oil strainer with the two bolts and
two nuts.
Torque: 7.8 N Vm (80 kgf Vcm, 69 in. Vlbf)
LU±16±
LUBRICATION SYSTEM Oil Pump
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