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 dermatitis. In addition, used
engine oil contains potentially harmful contaminants
which may cause skin cancer.
w Care should be taken, therefore, when changing engine,
oil to minimize the frequency and length of time your skin
is exposed to used engine oil. Protective clothing and
gloves, that cannot be penetrated by oil, should be worn.
The skin should be thoroughly washed with soap and
water, or use waterless hand cleaner, to remove any used
engine oil. Do not use gasoline, thinners, or solvents.
w In order to preserve the environment, used oil and used
oil filter must be disposed of only at designated disposal
sites.
1. DRAIN ENGINE OIL
(a) Remove the oil filler cap.
(b) Remove the oil drain plug, and drain the oil into acontainer.
2. REPLACE OIL FILTER (a) Using SST, remove the oil filter.
SST 09228±07500
(b) Clean the filter contact surface on the oil filter mounting.
(c) Lubricate the filter rubber gasket with clean engine oil.
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LUBRICATION SYSTEM Replacement of Engine Oil and Oil Filter
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(d) Tighten the oil filter by hand until the rubber gasketcontacts the seat of the filter mounting. Then using SST,
give it an additional 3/4 turn to seat the oil filter.
SST 09228±07500
3. FILL WITH ENGINE OIL (a) Clean and install the oil drain plug with a new gasket.
Torque: 25 N Vm (250 kgf Vcm, 18 ft Vlbf)
(b) Fill with new engine oil.
Oil grade: See page LU±5
Capacity: Drain and refillw/ Oil filter change
4.8 liters (5.1 US qts, 4.2 lmp. qts)
w/o Oil filter change 4.5 liters (4.8 US qts, 4.0 lmp.qts)
Dry fill 6.0 liters (6.3 US qts, 5.3 lmp. qts)
(c) Reinstall the oil filler cap.
4. START ENGINE AND CHECK FOR LEAKS
5. RECHECK ENGINE OIL LEVEL (See page LU±5)
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LUBRICATION SYSTEM Replacement of Engine Oil and Oil FilterLU±7
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OIL PUMP
COMPONENTS FOR REMOVAL AND
INSTALLATION
LU±8±
LUBRICATION SYSTEM Oil Pump
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REMOVAL OF OIL PUMP
(See Components on page LU±8)
HINT: When repairing the oil pump, the oil pan and strainer
should be removed and cleaned.
1. REMOVE ENGINE WITH TRANSMISSION (See pages EM±118 to 128)
2. SEPARATE ENGINE AND TRANSMISSION (See pages EM±129 to 130)
3. INSTALL ENGINE TO ENGINE STAND FOR REMOVAL
4. REMOVE TIMING BELT (See steps 8 to 35 on pages EM±36 to 43)
5. REMOVE NO.2 IDLER PULLEY, NO.1 IDLER PULLEY AND CRANKSHAFT TIMING PULLEY
(See steps 36 to 38 on page EM±44)
6. REMOVE OIL DIPSTICK AND GUIDE (a) Remove the mounting bolt.
(b) Pull out the dipstick guide together with dipstick guide.
(c) Remove the O±ring from the dipstick guide.
7. REMOVE BRACKET OF MAIN OXYGEN SENSOR CONNECTOR FROM NO.1 OIL PAN
Remove the bolt, and disconnect the connector bracket.
8. REMOVE OIL LEVEL SENSOR (a) Disconnect the level sensor connector.
(b) Remove the four mounting bolts, and disconnect theengine wire bracket.
(c) Remove the level sensor.
(d) Remove the gasket from the level sensor.
9. REMOVE NO.2 OIL PAN (a) Remove the twelve mounting bolts and two nuts.
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LUBRICATION SYSTEM Oil PumpLU±9
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(b) Insert the blade of SST between the No.1 and No.2 oilpan, cut off applied sealer and remove the No.1 oil pan.
SST 09032±00100
NOTICE:
w Be careful not to damage the No.2 oil pan contact surface
of the No.1 oil pan.
w Be careful not to damage the oil pan flange.
10. REMOVE OIL PAN BAFFLE PLATE
Remove the six bolts, two nuts and baffle plate.
11. REMOVE NO.1 OIL PAN (a) Remove the sixteen mounting bolts and two nuts.
(b) Remove the No.1 oil pan by prying the portions (A)between the cylinder block and No.1 oil pan with a
screwdriver.
NOTICE: Be careful not to damage the contact surfaces
of the cylinder block and No.1 oil pan.
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LUBRICATION SYSTEM Oil Pump
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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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COMPONENTS FOR DISASSEMBLY AND
ASSEMBLY OF OIL PUMP
DISASSEMBLY OF OIL PUMP
1. REMOVE RELIEF VALVEUsing snap ring pliers, remove the snap ring and following
parts:(1) Retainer
(2) Compression spring
(3) Relief valve.
2. REMOVE DRIVE AND DRIVEN ROTORS Remove the nine screws, pump body cover, the drive and
driven rotors.
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LUBRICATION SYSTEM Oil Pump
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INSPECTION OF OIL PUMP
1. INSPECT RELIEF VALVECoat the valve with engine oil and check that it falls smoothly
into the valve hole by its own weight.
If it doesn't, replace the relief valve. If necessary, replace the
oil pump assembly.
2. INSPECT DRIVE AND DRIVEN ROTORS
A. Place drive and driven rotors into oil pump body Face the mark of the rotors upward.
B. Inspect rotor tip clearance Using a feeler gauge, measure the clearance between the
drive and driven rotors.
Standard tip clearance: 0.110±0.240 mm
(0.0043±0.0094 in.)
Maximum tip clearance: 0.35 mm (0.0138 in.)
If the tip clearance is greater than maximum, replace the ro-
tors as a set.
C. Inspect rotor side clearance Using a feeler gauge and precision straight edge, measure
the clearance between the rotors and precision straight
edge.
Standard side clearance: 0.030±0.090 mm
(0.0012±0.0035 in.)
Maximum side clearance: 0.15 mm (0.0059 in.)
If the side clearance is greater than maximum, replace the ro-
tors as a set. If necessary, replace the oil pump assembly.
D. Inspect rotor body clearance Using a feeler gauge, measure the clearance between the
driven rotor and pump body.
Standard body clearance: 0.100±0.175 mm
(0.0039±0.0069 in.)
Maximum body clearance: 0.30 mm (0.0118 in.)
If the body clearance is greater than maximum, replace the
rotors as a set. If necessary, replace the oil pump assembly.
E. Remove drive and driven rotors
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LUBRICATION SYSTEM Oil PumpLU±13
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REPLACEMENT OF CRANKSHAFT
FRONT OIL SEAL
(See page EM±152)
ASSEMBLY OF OIL PUMP
(See Components on page LU±12)
1. INSTALL DRIVE AND DRIVEN ROTORS (a) Place the drive and driven rotors into oil pump body with
the mark facing upward.
(b) Install the pump body cover with the nine screws.
Torque: 10 N Vm (105 kgf Vcm, 8 ft Vlbf)
2. INSTALL RELIEF VALVE
(a) Insert the following parts into the oil pump body hole:(1) Relief valve
(2) Compression spring
(3) Retainer
(b) Using snap ring pliers, install the snap ring.
LU±14
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LUBRICATION SYSTEM Oil Pump
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INSTALLATION OF OIL PUMP
(See Components on page LU±8)
1. INSTALL OIL PUMP (a) Remove any old packing (FIPG) material and be careful
not to drop any oil on the contact surfaces of the oil
pump cylinder block.
w Using a razor blade and gasket scraper, remove all
the old packing (FIPG) material from the gasket
surfaces and sealing groove.
w Thoroughly clean all components to remove all the
loose material.
w Using a non±residue solvent, clean both sealing
surfaces.
NOTICE: Do not use a solvent which will affect the
painted surfaces.
(b) Apply seal packing to the oil pump as shown in the illustration.
Seal packing: Part No. 08826±00080 or equivalent
w Install a nozzle that has been cut to a 2±3 mm
(0.08±0.12 in.) opening.
HINT: Avoid applying an excessive amount to the surface. Be
particularly careful near oil passages.
w Parts must be assembled within 5 minutes of
application. Otherwise the material must be
removed and reapplied.
w Immediately remove nozzle from the tube and
reinstall cap.
(c) Place a new gasket in position on the cylinder block.
(d) Engage the spline teeth of the oil pump drive rotor with the large teeth of the crankshaft, and slide the oil pump.
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