ect LEXUS SC300 1991 Service Repair Manual

(b) Remove the two bolts, screw and upper radiatorsupport. Remove the two upper radiator supports.
(c) Lift out the radiator with the hoses.
8. REMOVE CHARCOAL CANISTER (a) Disconnect the vacuum hose and air hose from thecharcoal canister.
(b) Remove the charcoal canister.
9. DISCONNECT PS PUMP WITHOUT DISCONNECTING HOSES
(a) Disconnect the following hoses:(1) PS air hose from No. 4 timing belt cover
(2) PS air hose from air intake chamber
(b) Remove the bolt, nut and pump rear stay.
(c) Remove the two bolts, and disconnect the PS pump from the engine.
HINT: Put aside the PS pump, and suspend it.
10. D I S C O N N E C T A / C C O M P R ESSOR WITHOUT
DISCONNECTING HOSES
(a) Disconnect the compressor connector.
(b) Remove the three mounting bolts and nut.
(c) R e m o v e t h e t h r ough bolt, and disconnect the
compressor from the engine.
HINT: Put aside the compressor, and suspend it.
11. DISCONNECT ENGINE WIRE AND HOSES (a) Disconnect the brake booster vacuum hose from theunion.
(b) Disconnect the fuel return hose from the engine oil dipstick guide clamp and No. 2 fuel pipe. Plug the hose
end.
EM±66
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(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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(p) Remove the bolt holding the engine wire protector fromthe heater valve bracket.
(q) Remove the two nuts holding the engine wire clamp from the body.
12. (M/T) REMOVE TRANSMISSION SHIFT LEVER
(a) Using a screwdriver, pry out the rear side of the cupholder. Remove the cup holder.
(b) Remove the shift lever knob.
(c) Using a screwdriver, pry out the upper rear console panel.
(d) Remove the six mounting screws.
(e) Using a screwdriver, pry out the upper console panel.
(f) Remove the eight mounting bolts and shift lever.
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13. DISCONNECT ENGINE WIRE FROM CABIN(a) Remove the two clips, and pull out the instrument panelunder cover.
(b) Remove the four mounting screws.
(c) Disc onnect the connectors, and remove the lower
instrument panel finish panel and glove compartment
door assembly.
(d) Pull out the scuff plate.
(e) Take out the front side of the floor carpet.
(f) Remove the two nuts and ECU protector.
(g) Remove the nut, and disconnect the engine (& ECT) ECU from the floor panel.
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(h) Disconnect the following connectors:(1) Two connectors from engine (& ECT) ECU
(2) Connector from ABS & TRAC ECU
(3) Two connectors from TRAC ECU
(4) Four connectors from connector cassette
(5) Connector from A/C control assembly
(i) Pull out the engine wire from the cabin.
14. DISCONNECT PS PIPE FROM ENGINE Remove the two clamp bolts, and disconnect the PS pipe.
15. DISCONNECT HOSE, STARTER WIRE AND GROUND STRAP
(a) Remove the union bolt and two gaskets, disconnect thefuel inlet hose, and suspend the hose union end
upward.
HINT:
w Put a suitable container or shop towel under the fuel
pipe support.
w Slowly loosen the union bolt.
(b) Remove the nut and disconnect the starter wire.
(c) Disconnect the starter wire from the wire clamp.
(d) Disconnect the ground strap from the transmission.
16. (M/T)
DISCONNECT CLUTCH RELEASE CYLINDER FROM TRANS-
MISSION
Remove the two bolts and pull out the release cylinder.
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17. REMOVE NO. 2 FRONT EXHAUST PIPE(a) Remove the two bolts and nuts holding the front exhaust
pipe to the No. 2 front exhaust pipe.
(b) Remove the gasket and disconnect the front exhaust
pipe.
(c) Remove the four nuts, No. 2 front exhaust pipe and two gaskets.
18. REMOVE EXHAUST PIPE HEAT INSULATOR Remove the four nuts and heat insulator.
19. (A/T)
DISCONNECT TRANSMISSION CONTROL ROD
Remove the nut and disconnect the control rod from the shift
lever.
20. REMOVE INTERMEDIATE SHAFT (a) Remove the two center support bearing set bolts andthe adjusting washers.
HINT: Some vehicles are not equipped with an adjusting
washer.
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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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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)
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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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(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.
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