1991 LEXUS SC400 oil dipstick

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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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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8. INSTALL OIL LEVEL SENSOR(a) Install a new gasket to the level sensor.
(b) Install the level sensor with the four bolts.
Torque: 5.4 N Vm (55 kgf Vcm, 48 in. Vlbf)
HINT: Use bolts 16 mm (0.63 in.) in length.
(c) Connect the level sensor connector.
9. INSTALL BRACKET OF MAIN OXYGEN SENSOR CONNECTOR TO NO.1 OIL PAN
Install the connector bracket with bolt.
10. INSTALL OIL DIPSTICK GUIDE AND DIPSTICK (a) Install a new O±ring to the dipstick guide.
(b) Apply soapy water to the O±ring.
(c) Push in the dipstick guide into the guide hole of the No.1
oil pan.
(d) Install the engine wire bracket and dipstick guide with bolt.
(e) Install the oil dipstick.
11. INSTALL CRANKSHAFT TIMING PULLEY, NO.1 IDLER PULLEY AND NO.2 IDLER PULLEY
(See steps 1 to 3 on pages EM±46 and 47)
12. INSTALL TIMING BELT
(See steps 4 to 35 on pages EM±47 to 56)
13. REMOVE ENGINE STAND FROM ENGINE
14. ASSEMBLE ENGINE AND TRANSMISSION (See pages EM±165 and 166)
15. INSTALL ENGINE WITH TRANSMISSION (See pages EM±167 to 177)
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LUBRICATION SYSTEM Oil PumpLU±19
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REMOVAL OF OIL PUMP
(See Components on page LU±9)
HINT: When repairing the oil pump, the oil pan and strainer
should be removed and cleaned.
1. REMOVE ENGINE WITH TRANSMISSION (See pages EM±62 to 72)
2. SEPARATE ENGINE AND TRANSMISSION (See page EM±73)
3. INSTALL ENGINE TO ENGINE STAND FOR REMOVAL
4. REMOVE TIMING BELT (See steps 2 to 10 on pages EM±24 to 26)
5. REMOVE IDLER PULLEY AND CRANKSHAFT TIMING PULLEY
(See steps 11 and 12 on page EM±26)
6. REMOVE OIL DIPSTICK AND GUIDE (a) Remove the mounting bolt.
(b) Pull out the dipstick guide together with dipstick.
(c) Remove the O±ring from the dipstick guide.
7. REMOVE OIL LEVEL SENSOR (a) Disconnect the level sensor connector.
(b) Remove the four mounting bolts and level sensor.
(c) Remove the gasket from the level sensor.
NOTICE: Be careful not to drop the oil level sensor when
removing it.
8. REMOVE NO.2 OIL PAN (a) Remove the 14 mounting bolts and two nuts.
LU±10
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LUBRICATION SYSTEM Oil Pump
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6. INSTALL OIL LEVEL SENSOR(a) Install a new gasket to the level sensor.
(b) Install the level sensor with the four bolts.
Torque: 5.4 N Vm (55 kgf Vcm, 48 in. Vlbf)
(c) Connect the level sensor connector.
7. INSTALL OIL DIPSTICK GUIDE AND DIPSTICK (a) Install a new O±ring on the dipstick guide.
(b) Apply soapy water on the O±ring.
(c) Push in the dipstick guide into the guide hole of the No.1
oil pan.
(d) Install the guide with the mounting bolt.
8. INSTALL CRANKSHAFT TIMING PULLEY AND IDLER PULLEY
(See steps 1 and 2 on page EM±29)
9. INSTALL TIMING BELT (See steps 3 to 14 on pages EM±29 to 33)
10. REMOVE ENGINE STAND FROM ENGINE
11. ASSEMBLE ENGINE AND TRANSMISSION (See page EM±103)
12. INSTALL ENGINE WITH TRANSMISSION (See pages EM±104 to 112)
LU±18
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LUBRICATION SYSTEM Oil Pump
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Differential oil:See item 22 (B)
(c) Reinstall the filler plug securely.
22. R E P L A C E A U TO M AT I C T RANSMISSION AND
DIFFERENTIAL OIL (FLUID)
A. Replace automatic transmission fluid
(a) Remove the drain plug, and drain the fluid.
(b) Clean the drain plug.
(c) Reinstall the drain plug securely.
(d) With the engine ªOFFº, add new fluid through the dipstick
tube.
Fluid type:
ATF Type T±II or equivalent
Drain and refill capacity: 1.9 liters (2.0 US qts. 1.7 lmp. qts)
(e) Start the engine and shift the selector into all positions fromªPº through ªLº, and then shift into ªPº position.
(f) With the engine idling, check the fluid level. Add fluid up the ªCOOLº level on the dipstick.
(g) Check that the fluid level is in the ªHOTº range at the normal
operating temperature (70 ± 80
C (158 ± 176
F)) and add
as necessary.
NOTICE: Do not overfill.
B. Replace differential oil
(a) Remove the filler and drain plugs, and drain the oil.
(b) Clean the drain plug.
(c) Reinstall the drain plug securely.
(d) Add new oil until it begins to run out of the filler hole.
Differential oil: Oil grade
API GL±5
MA±16
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19. BRAKE PEDAL
(a) Check that pedal for smooth operation.
(b) Check that the pedal has the proper reservedistance and freeplay.
(c) Check the brake booster function.
20. BRAKES At a safe place, check that the brakes do not
pull to one side when applied.
21. PARKING BRAKE
(a) Check that the pedal has the proper travel.
(b) On a safe incline, check that the vehicle is held securely with only the parking brake applied.
22. A U TO M AT I C T RANSMISSION PARK
MECHANISM
(a) Check the lock release button of the selector lever for proper and smooth operation.
(b) On a safe incline, check that the vehicle is held securely with the selector lever in the ªPº
position and all brakes released.
MA00T±0A
UNDER HOOD
23. WINDSHIELD WASHER FLUIDCheck that there is sufficient fluid in the tank.
24. ENGINE COOLANT LEVEL
Check that the coolant level is between the
LEVEL lines on the see±through reservoir at
normal temperature (20 5C (68 5F)).
25. RADIATOR AND HOSES
(a) Check that the front of the radiator is clean and not blocked with leaves, dirt or bugs.
(b) Check the hoses for cracks, kinks, rot or loose connections.
26. BATTERY ELECTROLYTE LEVEL
Check the indicator.
When the indicator color is blue, the condition
is satisfactory. A red color indicates that dis-
tilled water must be added, and white indicates
that charging is necessary. 27. BRAKE FLUID LEVEL
Check that the brake fluid level is near the up-
per level line on the see±through reservoir.
28. ENGINE DRIVE BELT Check drive belt for fraying, cracks, wear or oili-
ness.
29. ENGINE OIL LEVEL
Check that level on the dipstick with the engine
turned off.
30. POWER STEERING FLUID LEVEL Check the level on the dipstick.
The level should be in the ªHOTº or ªCOLDº
range depending on the fluid temperature.
31. AUTOMATIC TRANSMISSION FLUID LEVEL
(a) Park the vehicle on a level surface.
(b) With the engine idling and the parking and foot brake applied, shift the selector into all
positions from ªPº to ªLº, and then shift into ªPº.
(c) Turn and pull out the dipstick and wipe off the fluid with a clean rag.
Re±insert the dipstick fully and check that the
fluid level is in the ªHOTº range.
(d) Perform this check with the fluid at normal driving temperature (70 ± 80
C (158 ± 176
F)).
If the level is at the low side, add fluid.
NOTICE: Do not overfill.
HINT: Wait about 30 minutes before checking
the fluid level after extended driving at high
speeds in hot weather, driving in heavy traffic
or with a trailer.
32. EXHAUST SYSTEM Visually inspect for cracks, holes or loose sup-
ports.
If any change in the sound of the exhaust or
smell of the exhaust fumes is noticed, have the
cause located and corrected.
MA±20
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ENGINE TUNE±UP
INSPECTION OF ENGINE COOLANT
1. INSPECT ENGINE COOLANT LEVEL AT RESERVOIRTANK
The coolant level should be above the ºCOLD LEVELº at
normal temperature (20 5C (68 5F)).
If low, check for leaks and add coolant up to the ºCOLD
LEVELº.
2. INSPECT ENGINE COOLANT QUALITY There should be any excessive deposits of rust or scales
around the radiator cap or reservoir tank filler hole, and the
coolant should be free from oil.
If excessively dirty, clean the coolant passages and replace
the coolant.
INSPECTION OF ENGINE OIL
1. INSPECT ENGINE OIL QUALITYCheck the oil for deterioration, entry 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.
Drain and refill oil capacity: w/ oil filter change4.8 liter (5.1 US qts, 4.2 lmp. qts)
w/o oil filter change 4.5 liter (4.8 US qts, 4.0 lmp. qts)
2. INSPECT ENGINE OIL LEVEL The oil level should be between the ºLº and ºFº marks on the
dipstick.
If low, check for leakage and add oil up to ºFº mark.
EM±8
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ENGINE MECHANICAL Engine Tune±Up
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