1991 LEXUS SC300 oil

(c) Disconnect the following connectors:(1) Two connectors from engine room main wire
(2) Igniter connector
(3) Theft deterrent horn connector
(d) Disconnect the wire harness from the two wire clamps.
(e) Using a 6 mm hexagon wrench, remove the bolt and connector bracket.
(f) Disc onnect the wire clamp and PS solenoid valve
connector.
(g) Disconnect the ground strap from the cylinder block.
(h) Disconnect the PS pressure switch connector.
(i) Disconnect the following connectors: (1) Ignition coil connector
(2) Noise filter connector
(j) Remove the cap and nut, and disconnect the generator wire.
(k) Disconnect the wire harness from the two wire clamps.
(l) Disconnect the following hoses: (1) Vacuum hose (from VSV for heater vale) from check valve.
(2) Heater water hose from heater water valve.
(3) Heater water hose from water by±pass pipe
(m) Disconnect the VSV connector.
(n) Disconnect the ground strap from the bracket on the body.
(o) Remove the bolt holding the engine wire protector from
the body.
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ENGINE MECHANICAL Cylinder BlockEM±67
WhereEverybodyKnowsYourName

(b) Place the matchmarks on the both flanges.
(c) Remove the four bolts, washers, nuts and intermediateshaft.
(d) Insert SST in transmission to prevent oil leakage.
SST 09325±20010 (M/T)
09325±40010 (A/T)
21. REMOVE ENGINE AND T RANSMISSION ASSEMBLY
FROM VEHICLE
(a) Attach the engine hoist chain to the engine hangers.
(b) Remove the two nuts holding the engine to the front suspension crossmember.
(c) Remove the four bolts, four nuts and rear engine mounting member.
(d) Lift the engine out of the vehicle slowly and carefully.
NOTICE: Remove carefully without damaging the power
steering gear housing or the park/neutral position switch
(A/T only).
(e) Make sure the engine is clear of all wiring, hoses and cables.
(f) Place the engine and transmission assembly onto the
stand.
EM±72
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ENGINE MECHANICAL Cylinder Block
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COMPONENTS FOR SEPARATION AND
ASSEMBLY OF ENGINE AND
TRANSMISSION
SEPARATION OF ENGINE AND
TRANSMISSION
1. (A/T)REMOVE OIL DIPSTICK GUIDE FOR TRANSMISSION
2. (A/T) REMOVE OIL COOLER PIPES FOR TRANSMISSION
3. DISCONNECT ENGINE WIRE FROM TRANSMISSION
4. REMOVE STARTER
5. SEPARATE ENGINE AND TRANSMISSION
6. (M/T) REMOVE CLUTCH COVER AND DISC
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ENGINE MECHANICAL Cylinder BlockEM±73
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PREPARATION FOR DISASSEMBLY
(See Components on pages EM±74 and 75)1. (M/T) REMOVE FLYWHEEL
2. (A/T) REMOVE DRIVE PLATE
Remove the eight bolts, two spacers and drive plate.
3. INSTALL ENGINE TO ENGINE STAND FOR DISASSEMBLY
4. REMOVE GENERATOR
5. REMOVE THROTTLE BODY WITH INTAKE AIR CONNECTOR (See pages EM±10 to 11)
6. REMOVE TIMING BELT AND PULLEYS (See pages EM±24 to 26)
7. REMOVE WATER PUMP AND BY±PASS HOSE
8. REMOVE FUEL PRESSURE PULSATION DAMPER
9. REMOVE CYLINDER HEAD (See pages EM±36 to 40)
10. REMOVE FUEL PIPE SUPPORT
11. REMOVE OIL PRESSURE SWITCH AND KNOCK SENSORS
SST 09816±30010
12. REMOVE LH ENGINE MOUNTING BRACKET
13. REMOVE RH ENGINE MOUNTING BRACKET
14. REMOVE OIL FILTER BRACKET (a) Remove the union bolt and oil filter bracket.
(b) Remove the gasket from the union bolt.
(c) Remove the O±ring from the oil filter bracket.
15. REMOVE OIL PUMP (See page LU±10)
EM±76
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ENGINE MECHANICAL Cylinder Block
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DISASSEMBLY OF CYLINDER BLOCK
(See Components on page EM±75)
1. REMOVE REAR OIL SEAL RETAINER (a) Remove the six bolts.
(b) Remove the oil seal retainer by prying the area between
the oil seal retainer and main bearing cap with a
screwdriver.
2. CHECK CONNECTING ROD THRUST CLEARANCE Using a dial indicator, measure the thrust clearance while
moving the two connecting rods back and forth.
Standard thrust clearance: 0.250±0.402 mm
(0.0098±0.0158 in.)
Maximum thrust clearance: 0.50 mm (0.0197 in.)
If the thrust clearance is greater than maximum, replace the
connecting rod assembly(s). If necessary, replace the crank-
shaft.
Connecting rod thickness: 25.898±25.950 mm (1.0196±1.0217 in.)
3. REMOVE CONNECTING ROD CAPS AND CHECK OILCLEARANCE
(a) Check the matchmarks on the connecting rod and cap.
(b) Remove the connecting rod cap bolts.
(c) Using the two removed connecting rod bolts, removethe connecting rod cap and lower bearing by wiggling
the connecting rod cap right and left.
HINT: Keep the lower bearing inserted with the connecting
rod cap.
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ENGINE MECHANICAL Cylinder BlockEM±77
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(d) Clean the crank pin and bearings.
(e) C h e c k t h e c r a n k p i n a n d b e a r i n g f o r p i t t i n g a n dscratches.
If the crank pin or bearing are damaged, replace the bear-
ings. If necessary, replace the crankshaft.
(f) Lay a strip of Plastigage across the crank pin.
(g) Install the connecting rod cap with the two bolts.
(See step 6 on pages EM±98 and 99)
Torque: 1st 29 N Vm (300 kgf Vcm, 22 ft Vlbf)
2nd turn 90 5
HINT: Do not turn the crankshaft.
(h) Remove the two bolts, connecting rod cap and lower
bearing. (See procedures (b) and (c) above)
(i) Measure the Plastigage at widest point.
Standard oil clearance: STD size 0.035±0.053 mm (0.0014±0.0021 in.)
U/S 0.25 0.040±0.078 mm (0.0016±0.0031 in.)
Maximum oil clearance:
STD size 0.08 mm (0.0031 in.)
U/S 0.25 0.09 mm (0.0035 in.)
If the oil clearance is greater than maximum, replace the
bearings. If necessary, replace the crankshaft.
EM±78
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ENGINE MECHANICAL Cylinder Block
WhereEverybodyKnowsYourName

HINT:
wKeep the bearings, connecting rod and cap together.
w Arrange the piston and connecting rod assemblies in
correct order.
5. CHECK CRANKSHAFT THRUST CLEARANCE Using a dial indi cator, measure the thrust clearance while pry-
ing the crankshaft back and forth with a screwdriver.
Standard thrust clearance: 0.020±0.220 mm
(0.0008±0.0087 in.)
Maximum thrust clearance: 0.30 mm (0.0118 in.)
If the thrust clearance is greater than maximum, replace the
thrust washers as a set.
Thrust washer thickness:
1.940±1.990 mm (0.0764±0.0783 in.)
6. REMOVE MAIN BEARING CAPS AND CHECK OILCLEARANCE
(a) Remove the main bearing cap bolts.
(b) Using the removed main bearing cap bolts, pry the main
bearing cap back and forth, and remove the main
bearing caps, lower bearings and lower thrust washers
(No. 4 main bearing cap only).
HINT:
w Keep the lower bearing and main bearing cap together.
w Arrange the main bearing caps and lower thrust
washers in correct order.
(c) Lift out the crankshaft.
HINT: Keep the upper bearing and upper thrust washer to-
gether with the cylinder block.
EM±80
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ENGINE MECHANICAL Cylinder Block
WhereEverybodyKnowsYourName

(d) Clean each main journal and bearing.
(e) Check each main journal and bearing for pitting andscratches.
If the journal or bearing is damaged, replace the bearings.
If necessary, grind or replace the crankshaft.
(f) Place the crankshaft on the cylinder block.
(g) Lay a strip of Plastigage across each journal.
(h) Install the main bearing caps.
(See step 4 on pages EM±97 and 98)
Torque: 1st 44 N Vm (450 kgf Vcm, 33 ft Vlbf)
2nd turn 90 5
HINT: Do not turn the crankshaft.
(i) Remove the main bearing caps.
(See procedures (a) and (b) above)
(j) Measure the Plastigage at its widest point.
Standard clearance:
STD size 0.026±0.040 mm (0.0010±0.0016 in.)
U/S 0.25 0.025±0.061 mm (0.0010±0.0024 in.)
Maximum clearance: STD size 0.06 mm (0.0024 in.)
U/S 0.25 0.08 mm (0.0031 in.)
If the oil clearance is greater than maximum, replace the bearings.
If necessary, replace the crankshaft.
±
ENGINE MECHANICAL Cylinder BlockEM±81
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