engine LEXUS SC400 1991 Service Repair Manual

31. REMOVE TAILPIPE
(a) Remove the 4 nuts holding the tailpipes to the center exhaust
pipe.
(b) Disconnect the hook from the ring on tailpipe bracket, and remove the tailpipe and gasket. Remove the 2 tailpipes.
32. REMOVE CENTER EXHAUST PIPE Disconnect the 2 hooks of the exhaust pipe from the rings on
exhaust pipe brackets, and remove the exhaust pipe.
33. REMOVE HEAT INSULATOR FOR FRONT EXHAUST PIPE
Remove the 4 nuts and heat insulator.
34. REMOVE CENTER FLOOR CROSSMEMBER BRACE Remove the 4 bolts and crossmember brace.
35. REMOVE PROPELLER SHAFT (See page PR±6)
EG±148
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36. DISCONNECT TRANSMISSION CONTROL ROD FROMSHIFT LEVER
Remove the nut, and disconnect the control rod from the shift
lever.
37. REMOVE ENGINE AND TRANSMISSION A SSEMBLY
FROM VEHICLE
(a) Attach the engine chain hoist to the engine hangers.
(b) Remove the 2 nuts holding the engine mounting insulators to
the front suspension crossmember.
(c) Remove the 4 bolts, 4 nuts and rear engine m ounting
member. Disconnect the ground strap.
(d) Lift the engine out of the vehicle slowly and carefully. HINT: Make sure the engine is clear of all wirings, hoses and
cables.
NOTICE: Be careful not hit the PS gear housing, PNP switch
and ABS actuator.
(e) Place the engine and transmission assembly onto the stand.
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COMPONENTS FOR ENGINE &
TRANSMISSION SEPERATION AND
ASSEMBLY
EG0BS±0F
ENGINE & TRANSMISSION SEPARATION
EG24X±01
(See Components for Engine & Transmission Separation and
Assembly)
1. REMOVE OIL DIPSTICK GUIDE AND DIPSTICK FOR TRANSMISSION
(a) Remove the bolt.
(b) Pull out the dipstick guide and dipstick from the port of transmission.
(c) Remove the O±ring from the dipstick guide.
2. REMOVE OIL COOLER PIPES FOR TRANSMISSION
(a) Remove the 2 bolts.
(b) Loosen the 2 union nuts, and remove the oil cooler pipes.
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3. DISCONNECT ENGINE WIRE
(a) Disconnect the following connector:(1) O/D direct clutch speed sensor connector
(2) No.1 VSS connector for Speedometer
(3) No.2 VSS connector for ECM
(4) PNP switch connector
(5) Solenoid connector
(b) D i s c onnect the 5 wire clamps from the brackets on
transmission.
4. REMOVE TRANSMISSION (See page AT±23)
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COMPONENTS FOR CYLINDER BLOCK
DISASSEMBLY AND ASSEMBLY
EG0BS±0E
EG±152±
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PREPARATION FOR DISASSEMBLY
EG34Y±01
(See Components for Cylinder Block Disassembly and As-sembly)
1. REMOVE DRIVE PLATE Remove the 8 bolts, front spacer drive plate and rear spacer.
2. INSTALL ENGINE TO ENGINE STAND FOR DISASSEMBLY
3. REMOVE TIMING BELT AND PULLEYS (See pages EG±49 to 57)
4. REMOVE CYLINDER HEAD (See pages EG±75 to 93)
5. REMOVE RH ENGINE MOUNTING BRACKET Remove the 4 bolts and mounting bracket.
6. REMOVE LH ENGINE MOUNTING BRACKET
(a) Remove the 4 bolts and mounting bracket.
(b) Remove the bolt, and disconnect the engine wire from the mounting bracket.
7. REMOVE STARTER
(a) Remove the 2 bolts, and disconnect the starter from the cylinder block.
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(b) Disconnect the engine wire clamp from the bracket on thestarter.
(c) Remove the nut, and disconnect the starter wire.
(d) Disconnect the starter connector, and remove the starter.
8. REMOVE KNOCK SENSORS
(a) Disconnect the 2 knock sensor connectors.
(b) Using SST, remove the 2 knock sensors.
SST 09816±30010
9. REMOVE WATER BYPASS PIPE
(a) Remove the 2 bolts.
(b) Pull out the water bypass pipe from the water pump.
(c) Remove the O±ring from the water bypass pipe.
10. REMOVE ENGINE WIRE
(a) Disconnect the following connector: wCrankshaft position sensor connector
w Oil pressure switch connector
w Oil level sensor connector
(b) Remove the 3 bolts and engine wire cover from the LH side of the cylinder block.
(c) Remove the 2 bolts and engine wire.
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11. REMOVE WATER PUMP
(a) Remove the 5 bolts, 2 stud bolts and nut.
(b) Using a screwdriver remove the water pump by prying theportions between the water pump and cylinder block.
12. REMOVE NO.2 AND NO.1 OIL PANS
(See steps 9 to 14 on pages EG±501 and 502)
13. REMOVE OIL PUMP
(a) Remove the 8 bolts.
(b) Using a screwdriver, remove the oil pump by prying the portions between the oil pump and cylinder block.
(c) Remove the O±ring from the cylinder block.
14. REMOVE GENERATOR BRACKET
Remove the bolt and generator bracket.
15. REMOVE WATER SEAL PLATE
Remove the 2 bolts and seal plate.
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CYLINDER BLOCK DISASSEMBLY
EG1KT±04
(See Components for Cylinder Block Disassembly and As-sembly)
1. REMOVE REAR OIL SEAL RETAINER
(a) Remove the 7 bolts.
(b) Using a screwdriver, remove the oil sel retainer by prying the portions between the oil seal retainer and main bearing cap.
(c) Remove the O±ring.
2. CHECK CONNECTING ROD OIL CLEARANCE Using a dial indicator, measure the thrust clearance while
moving the connecting rod back an forth.
Standard thrust clearance:
0.160 ± 0.290 mm (0.0063 ± 0.0138 in.)
Maximum thrust clearance: 0.35 mm (0.0138 in.)
If the thrust clearance is greater than maximum, replace the
connecting rod assembly(s). If necessary, replace the crank-
shaft.
Connecting rod thickness:
22.880 ± 22.920 mm (0.9008 ± 0.9024 in.)
3. REMOVE CONNECTING ROD CAPS AND CHECK OILCLEARANCE
(a) Check the matchmarks on the connecting rod and cap to ensure correct reassembly.
(b) Remove the 2 connecting rod cap bolts.
(c) Using the 2 removed connecting rod cap bolts, remove the 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 bearing.
(e) Check the crank pin and bearing for pitting and scratches.If the crank pin or bearing is damaged, replace the bearings.
If necessary, replace the crankshaft.
(f) Lay a strip of Plastigage across the crank pin.
(g) Install the connecting rod cap with the 2 bolts. (See step 7 on page EG±183)
Torque:
1st 25 N Vm (250 kgf Vcm, 18 ft Vlbf)
2nd Turn 90 5
NOTICE: Do not turn the crankshaft.
(h) Remove the 2 bolts, connecting rod cap and lower bearing. (See procedure (b) and (c) above)
(i) Measure the Plastigage at its widest point.
Standard oil clearance: 0.027 ± 0.053 mm (0.0011 ± 0.0021 in.)
Maximum oil clearance: 0.065 mm (0.0026 in.)
If the oil clearance is greater than maximum, replace the
bearings. If necessary, replace the crankshaft.
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