1991 LEXUS SC400 engine oil

(b) Remove the two bolts and ignition coil.
7. REMOVE INTAKE AIR CONNECTOR (a) Disconnect the following hoses:(1) Air hose from ISC valve
(2) Air hose (from PS air control valve) from intake air
connector
(b) Remove the bolt holding the intake air connector to the cylinder head cover.
(c) Loosen the two hose clamps.
(d) Disconnect the intake air connector from the throttle
body and air cleaner hose, and remove the throttle body.
8. REMOVE UPPER HIGH±TENSION CORD COVER (a) Remove the two mounting bolts.
(b) Disconnect the front side claw groove of the cord coverfrom the claw of the lower cover, and remove the cord
cover.
9. REMOVE RH ENGINE WIRE COVER Remove the bolt and engine wire cover.
CO±28
±
COOLIING SYSTEM Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)
WhereEverybodyKnowsYourName

15. REMOVE RH NO.2 TIMING BELT COVER(a) Disconnect the cam position sensor connector from theignition coil bracket.
(b) Disconnect the cam position sensor wire from the clamp
on the timing belt cover.
(c) Remove the five mounting bolts.
(d) Disconnect the wire clamp from the timing belt cover,
and remove the timing belt cover and four gasket.
16. REMOVE LH NO.2 TIMING BELT COVER (a) Disconnect the cam position sensor wire from the clamp
on the timing belt cover.
(b) Disconnect the cam position sensor connector.
(c) Remove the three mounting bolts.
(d) Disconnect the connector grommet from the timing belt cover, and remove the timing belt cover and two
gaskets.
17. DISCONNECT PRESSURE AND SUCTION HOSES FROM HYDRAULIC PUMP
18. REMOVE HYDRAULIC PUMP (a) Disconnect the solenoid valve connector.
(b) Remove the two mounting bolts and two nuts.
(c) Disconnect the engine speed sensor wire clamp.
(d) Remove the hydraulic pump.
CO±30
±
COOLIING SYSTEM Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)
WhereEverybodyKnowsYourName

INSTALLATION OF HYDRAULIC PUMP
(See Components on page CO±26)
1. INSTALL HYDRAULIC PUMP (a) Install the hydraulic pump, solenoid valve connector
clamp and engine speed sensor wire clamp with the two
bolts and two nuts.
Torque:
12 mm head 16 N Vm (160 kgf Vcm, 12 ft Vlbf)
14 mm head 20 N Vm (310 kgf Vcm, 22 ft Vlbf)
HINT: Each bolt length is indicated in the illustration.
Bolt length:
A 106 mm (4.17 in.) for 12 mm head
B 114 mm (4.49 in.) for 14 mm head
(b) Connect the solenoid valve connector.
2. CONNECT PRESSURE AND SUCTION HOSES TO HYDRAULIC PUMP
(a) Connect the pressure hose with new gasket and unionbolt.
Torque: 64 N Vm (650 kgf Vcm, 47 ft Vlbf)
(b) Connect suction hose.
3. INSTALL RH NO.2 TIMING BELT COVER
(a) Install the four gaskets to the timing belt cover.
(b) Install the connector grommet to the timing belt cover.
(c) Install the timing belt cover with the five bolts.
Torque: 16 N Vm (160 kgf Vcm, 12 ft Vlbf)
HINT (12 mm head bolt): Use bolts 106 mm (4.17 in.) in
length.
(d) Install the wire clamp to the timing belt cover.
(e) Install the cam position sensor wire to the wire clamp on
the timing belt cover.
(f) Install the cam position sensor connector to the ignition coil bracket.
4. INSTALL LH NO.2 TIMING BELT COVER (a) Install the two gaskets to the timing belt cover.
(b) Run the cam po sition sensor wire through the timing belt
cover hole.
(c) Install the timing belt cover and connector bracket with the three bolts.
(d) Connect the cam position sensor connector.
(e) In sta ll th e ca m po sitio n se n so r c onnector to the
connector bracket.
(f) Install the cam position sensor wire to the wire clamp on
the timing belt cover.
(g) Install the connector grommet to the timing belt cover.
CO±42
±
COOLIING SYSTEM Electronically Controlled Hydraulic Cooling Fan
(Hydraulic Pump)
WhereEverybodyKnowsYourName

4. REMOVE OIL COOLERRemove the three bolts and oil cooler.
INSPECTION OF OIL COOLER
INSPECT OIL COOLER
Check the oil cooler for damage or clogging.
If necessary, replace the oil cooler.
INSTALLATION OF OIL COOLER
(See Components on page CO±58)
1. INSTALL OIL COOLER Install the oil cooler with the three bolts.
Torque: 18 N Vm (180 kgf Vcm, 13 ft Vlbf)
2. CONNECT HOSES FROM OIL COOLER
Connect the following hoses:(1) Inlet hose (from reservoir tank)
(2) Outlet hose (from hydraulic motor)
3. INSTALL PS OIL COOLER Install the oil cooler with the two bolts.
4. REMOVE FENDER LINER
5. FILL COOLING FAN RESERVOIR TANK WITH FLUID
(See pages CO±23 and 24)
6. START ENGINE AND CHECK FOR LEAKS
±
COOLIING SYSTEM Electronically Controlled Hydraulic
Cooling Fan (Oil Cooler)CO±59
WhereEverybodyKnowsYourName

 
Compression at 250 rpm STD 1,226 kPa (12.5 kgf/cm2, 178 psi) or
more
 pressureLimit 981 kPa (10.0 kgf/cm2, 142 psi)  Difference of pressure between each cylinder  98 kPa (1.0 kgf/cm2, 14 psi) or less 

Timing belt
tensionerProtrusion from housing end10.5±11.5 mm (0.413±0.453 in.)
 Cylinder head Warpage Limit 0.10 mm (0.039 in.)
  Valve seat  
  Refacing angle  30
5, 45 5, 75 5
  Contacting angle  455
  Contacting width  1.0±1.4 mm (0.039±0.055 in.)
  Cylinder head bolt thread inside diameter STD 9.770±9.960 mm (0.3846±0.3921 in.)
   Limit 9.60 mm (0.3780 in.)
 Valve guideInside diameter6.010±6.030 mm (0.2366±0.2374 in.)
 bushing Outside diameter (for repair part) STD 11.048±11.059 mm (0.4350±0.4354
in.)
 O/S 0.05 11.098±11.109 mm (0.4369±0.4374 in.) ValveValve overall lengthSTD (Intake)94.95 mm (3.7382 in.)   (Exhaust) 96.90 mm (3.8150 in.)   Limit (Intake) 94.45 mm (3.7185 in.)   (Exhaust) 96.40 mm (3.7953 in.)
  Vale face angle  44.55
  Stem diameter Intake 5.970±5.985 mm (0.2350±0.2356 in.)
   Exhaust 5.965±5.980 mm (0.2348±0.2354 in.)
  Stem oil clearance STD (Intake) 0.025±0.060 mm (0.0010±0.0024 in.)
   (Exhaust) 0.030±0.065 mm (0.0012±0.0026 in.)
   Limit (Intake) 0.08 mm (0.0031 in.)
   (Exhaust) 0.10 mm (0.0039 in.)
  Margin thickness STD 1.0 mm (0.039 in.)
   Limit 0.5 mm (0.020 in.)
 Valve spring Squareness Limit 2.0 mm (0.079 in.)
  Free length  43.6 mm (1.717 in.)
  Installed tension at 32.9 mm (1.295 in.)  186±206 N (19.0±21.0 kgf, 41.9±46.3
lbf)
 

Valve lifter 

Lifter diameter 


 

30.966±30.976 mm (1.2191±2.2195
in.)
 


 


Lifter bore diameter 


 


31.000±31.016 mm (1.2205±1.2211
in.)
  Oil clearance STD 0.024±0.050 mm (0.0009±0.0020 in.)
   Limit 0.07 mm (0.0028 in.)
EG±206±
1UZ ± FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

 
Camshaft Thrust clearance STD 0.040±0.090 mm (0.0016±0.0035 in.)
   Limit 0.12 mm (0.0047 in.)
  Journal oil clearance  
  Exhaust camshaft thrust portion STD 0.025±0.061 mm (0.0010±0.0024 in.)  
Others
 
STD
 
0.030±0.067 mm (0.0012±0.0026 in.)   
Limit
 
0.10 mm (0.0039 in.)  Journal diameter  
  Exhaust camshaft thrust portion  23.959±23.975 mm (0.9433±0.9539 in.)  Others  26.954±26.970 mm (1.0612±1.0618 in.)  Circle runout Limit 0.08 mm (0.0031 in.)  Cam lobe height STD (Intake) 41.710±41.810 mm (1.6421±1.6461 in.)   (Exhaust) 41.910±42.010 mm (1.6500±1.6539 in.)   Limit (Intake) 41.56 mm (1.6362 in.)
   (Exhaust) 41.76 mm (1.6441 in.)
  Camshaft gear backslash STD 0.020±0.200 mm (0.0008±0.0079 in.)
   Limit 0.30 mm (0.0188 in.)
  Camshaft gear spring end free distance  18.2±18.8 mm (0.712±0.740 in.)
 Air intake Warpage Limit 0.15 mm (0.0059 in.)
 chamber
 Manifold Warpage Limit (Intake) 0.15 mm (0.0059 in.)
   (Exhaust) 1.00 mm (0.0394 in.)
 Cylinder block Cylinder head surface warpage Limit 0.07 mm (0.0028 in.)
  Cylinder bore±diameter Mark 1 87.500±87.510 mm (3.4449±3.4453 in.)
   Mark 2 87.510±87.520 mm (3.4453±3.4457 in.)
   Mark 3 87.520±87.530 mm (3.4457±3.4461 in.)
Limit87.73 mm (3.4539 in.)  
Main journal bore diameter (Reference)
 
Mark 00
 
72.000 mm (2.8346 in.)   Mark 01 72.001 mm (2.8347 in.)   Mark 02 72.002 mm (2.8347 in.)   Mark 03 72.003 mm (2.8348 in.)   Mark 04 72.004 mm (2.8348 in.)   Mark 05 72.005 mm (2.8348 in.)   Mark 06 72.006 mm (2.8349 in.)   Mark 07 72.007 mm (2.8349 in.)
   Mark 08 72.008 mm (2.8350 in.)
   Mark 09 72.009 mm (2.8350 in.)
   Mark 10 72.010 mm (2.8350 in.)
   Mark 11 72.011 mm (2.8351 in.)
   Mark 12 72.012 mm (2.8351 in.)
   Mark 13 72.013 mm (2.8352 in.)
   Mark 14 72.014 mm (2.8352 in.)
   Mark 15 72.015 mm (2.8352 in.)
   Mark 16 72.016 mm (2.8353 in.)
 Main bearing cap stud bolt tension portion diameter
   STD 7.500±7.600 mm (0.2953±0.2992 in.)
   Limit 7.40 mm (0.2913 in.)
±
1UZ ± FE ENGINE ENGINE MECHANICALEG±207
WhereEverybodyKnowsYourName

 
Piston and Piston diameter STD (Mark1) 87.470±87.480 mm (3.4437±3.4441 in.)
 piston ring  (Mark 2) 87.480±87.490 mm (3.4441±3.4445 in.)   (Mark 3) 87.490±87.500 mm (3.4445±3.4449 in.)  Piston oil clearance STD 0.020±0.040 mm (0.0008±0.0016)   Limit 0.06 mm (0.0024 in.)  Piston ring groove clearance No.1 0.020±0.060 mm (0.0008±0.0024 in.)   No.2 0.015±0.055 mm (0.0006±0.0022 in.)  Piston ring end gap STD (No.1) 0.250±0.450 mm (0.0098±0.0177 in.)
   (No.2) 0.350±0.600 mm (0.0138±0.0236 in.)
   (Oil) 0.150±0.500 mm (0.0059±0.0197 in.)
   Limit (No.1) 1.05 mm (0.0413 in.)
   (No.2) 1.20 mm (0.0472 in.)
   (Oil) 1.10 mm (0.0433 in.)
 Connecting Thrust clearance STD 0.160±0.290 mm (0.0063±0.0138 in.)
 rod  Limit 0.35 mm (0.0138 in.)
  Connecting rod thickness  22.880±22.920 mm (0.9008±0.9024 in.)
  Connecting rod big end inside diameter (Ref-
erence)  
   Mark 1 55.000±55.006 mm (2.1654±2.1656 in.)   Mark 2 55.006±55.012 mm (2.1656±2.1658 in.)   Mark 3 55.012±55.018 mm (2.1658±2.1661 in.)   Mark 4 55.018±55.024 mm (2.1661±2.1663 in.)  Connecting rod bearing center wall thickness  
  (Reference) Mark 2 1.484±1.487 mm (0.0584±0.0585 in.)   Mark 3 1.487±1.490 mm (0.0585±0.0587 in.)
   Mark 4 1.490±1.493 mm (0.0587±0.0588 in.)
   Mark 5 1.493±1.496 mm (0.0588±0.0589 in.)
   Mark 6 1.496±1.499 mm (0.0589±0.0590 in.)
   Mark 7 1.499±1.502 mm (0.0590±0.0591 in.)
  Connecting rod oil clearance STD 0.027±0.053 mm (0.0011±0.0021 in.)
   Limit 0.065 mm (0.0026 in.)
 \
 \
Rod bend Limit per 100 mm (3.94 in.) 0.05 mm (0.0020 in.)
 \
 \
Rod twist Limit per 100 mm (3.94 in.) 0.15 mm (0.0059 in.)
  Bushing inside diameter  22.005±22.017 mm (0.8663±0.8668 in.)
  Piston pin diameter  21.997±22.009 mm (0.8660±0.8665 in.)
  Bushing oil clearance STD 0.005±0.011 mm (0.0002±0.0004 in.)
Limit0.05 mm (0.0020 in.)  
Connecting rod bolt tension portion diameter
 
STD
 
7.200±7.300 mm (0.2835±0.2874 in.)   
Limit
 
7.00 mm (0.2756 in.)
EG±208±
1UZ ± FE ENGINE ENGINE MECHANICAL
WhereEverybodyKnowsYourName

 
Crankshaft Thrust clearance STD 0.020±0.220 mm (0.0008±0.0087 in.)
   Limit 0.30 mm (0.0118 in.)
  Thrust washer thickness  2.440±2.490 mm (0.0961±0.0980 in.)
  Main journal bore diameter on cylinder block  67.026±67.033 mm (2.8388±2.6391 in.)  
(with main bearing)
  
  
Main journal oil clearance
 
STD
 
0.026±0.045 mm (0.0010±0.0018 in.)   Limit 0.055 mm (0.0022 in.)  Main journal diameter  66.988±67.000 mm (2.6373±2.6378 in.) \
 \
Main bearing center wall thickness (Reference) 
   Mark 1 2.486±2.489 mm (0.0979±0.0980 in.)   Mark 2 2.489±2.492 mm (0.0980±0.0981 in.)   Mark 3 2.492±2.495 mm (0.0981±0.0982 in.)   Mark 4 2.495±2.498 mm (0.0982±0.0983 in.)
   Mark 5 2.498±2.501 mm (0.0983±0.0985 in.)
  Crank pin diameter  51.982±52.000 mm (2.0465±2.0472 in.)
  Circle runout Limit 0.08mm (0.0031 in.)
  Main journal taper and out±of±round Limit 0.02mm (0.0008 in.)
  Crank pin taper and out±of±round Limit 0.02mm (0.0008.in)
EGOC6±0C
TORQUE SPECIFICATION
 Part tightened  NVm kgf Vcm ft Vlbf
 No.1 idler pulley x Cylinder Block  34 350 25
 No.2 idler pulley x Cylinder block3435025
 Hydraulic pump x Cylinder block for 12 mm head 16 160 12

yy
for 14 mm head3031022 Crankshaft pulley x Crankshaft  245 2,500 181 Camshaft timing pulley x Camshaft  108 1,100 80 Timing belt tensioner x Oil pump  26 270 20 Spark plug x Cylinder head  18 180 13
 Drive belt tensioner x Cylinder block  16 160 12
 Generator x Generator bracket  37 380 27
 Generator x Cylinder block3738027
 Distributor housing x Cylinder head1818513
 Distributor rotor x Camshaft timing pulley3.83934 in.
lbf
 Distributor cap x Distributor housing3.83934 in.
lbf
 RH No.2 timing belt cover x Cylinder blockfor 12 mm head1818513
Drive belt idler pulley x Fan bracket3738027 
A/C compressor x Cylinder block4950036 A/C compressor x Fan bracket  49 500 36 A/C compressor stay x Oil filter bracket  29 300 22 Upper radiator support x Body  12 120 9 Exhaust manifold x Cylinder head  44 450 33
 Cylinder head x Cylinder block 1st 39 400 29
  2nd Turn 90 5  
 Camshaft bearing cap x Cylinder head  16 160 12
 Cylinder head cover x Cylinder head  5.9 60 52 in.Vlbf
Engine hanger x Cylinder head3738027 EGR pipe x RH exhaust pipe  18 185 13 Rear water bypass joint x Cylinder head  18 185 13
±
1UZ ± FE ENGINE ENGINE MECHANICALEG±209
WhereEverybodyKnowsYourName