1991 LEXUS SC300 Service Repair Manual

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Page 1369 of 4087

LEXUS SC300 1991 Service Repair Manual
SERVICE SPECIFICATIONS
SERVICE DATA
EG065±0A Tune±up Battery specific gravity 1.27±1.29

SERVICE SPECIFICATIONS
SERVICE DATA
EG065±0A Tune±up Battery specific gravity 1.27±1.29
(when fully charged at 205C (68 5F))
High±tension cord resistance Limit 25 k per cord
Valve clearance (Cold) Intake 0.15±0.25 mm (0.006±0.010 in.)
Exhaust 0.25±0.35 mm (0.010±0.014 in.)
Valve clearance adjusting shimNo.012.500 mm (0.0984 in.) No.62 2.525 mm (0.0994 in.) No.63 2.550 mm (0.1004 in.) No.64 2.575 mm (0.1014 in.) No.06 2.600 mm (0.1024 in.)
No.65 2.625 mm (0.1033 in.)
No.66 2.650 mm (0.1043 in.)
No.67 2.675 mm (0.1053 in.)
No.13 2.700 mm (0.1063 in.)
No.68 2.725 mm (0.1073 in.)
No.18 2.750 mm (0.1083 in.)
No.192.775 mm (0.1093 in.) No.23 2.800 mm (0.1102 in.) No.70 2.825 mm (0.1112 in.) No.28 2.850 mm (0.1122 in.) No.71 2.875 mm (0.1132 in.)
No.33 2.900 mm (0.1142 in.)
No.72 2.925 mm (0.1152 in.)
No.38 2.950 mm (0.1161 in.)
No.73 2.975 mm (0.1171 in.)
No.43 3.000 mm (0.1181 in.)
No.743.025 mm (0.1191 in.) No.48 3.050 mm (0.1201 in.) No.75 3.075 mm (0.1211 in.) No.51 3.100 mm (0.1220 in.) No.76 3.125 mm (0.1230 in.) No.77 3.150 mm (0.1240 in.)
No.78 3.175 mm (0.1250 in.)
No.56 3.200 mm (0.1260 in.)
No.79 3.225 mm (0.1270 in.)
No.80 3.250 mm (0.1280 in.)
No.81 3.275 mm (0.1289 in.)
No.613.300 mm (0.1299 in.) Ignition timing 8 ± 12 5 BTDC @ idle

(w/ Terminals TE1 and E1 connected
of DLC1)
Idle speed 700
+ 50 rpm
Intake at idle speed 60 kPa (450 mmHg. 17.7 in.Hg)
manifold
vacuum
±
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Page 1370 of 4087

LEXUS SC300 1991 Service Repair Manual

Compression at 250 rpm STD 1,226 kPa (12.5 kgf/cm2, 178 psi) or
more
pressureLimit 981 kPa (10.0 kgf/cm2,

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±
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Page 1371 of 4087

LEXUS SC300 1991 Service Repair Manual

Camshaft Thrust clearance STD 0.040±0.090 mm (0.0016±0.0035 in.)

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.)
±
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Page 1372 of 4087

LEXUS SC300 1991 Service Repair Manual

Piston and Piston diameter STD (Mark1) 87.470±87.480 mm (3.4437±3.4441 in.)
piston ring

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±
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Page 1373 of 4087

LEXUS SC300 1991 Service Repair Manual

Crankshaft Thrust clearance STD 0.020±0.220 mm (0.0008±0.0087 in.)

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
±
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Page 1374 of 4087

LEXUS SC300 1991 Service Repair Manual

Front water bypass joint x Cylinder head 18 185 13
Intake manifold x Cylinder hea

Front water bypass joint x Cylinder head 18 185 13
Intake manifold x Cylinder head1818513
Delivery pipe x Intake manifold1818513
Fuel return pipe x Fuel pressure regulator

35

360

26 Fuel inlet hose x Delivery pipe 39 400 29 for SST 33 340 24 Cold start injector x Air intake chamber 7.8 80 69 in.Vlbf Air intake chamber x Intake manifold 18 185 13 EGR pipe x Air intake chamber 18 185 13
EGR pipe x RH cylinder head 18 185 13
Cold start injector tube x Air intake chamber 15 150 11
Union (for brake booster) x Air intake chamber 29 300 22
Throttle body x Air intake chamber 18 185 13
IAC valve x Air intake chamber 18 185 13
EGR valve adaptor x Air intake chamber 18 185 13
EGR valve x EGR valve adaptor 18 185 13
Timing belt rear plate x Cylinder head7.88069 in. Vlbf
Water outlet housing x Water pump

18

185

13 Main bearing stud bolt x Cylinder block 15 150 11 Main bearing cap x Cylinder block for nut (1st) 27 275 20 (2nd) Turn 90 5
for bolt 49 500 36 Connecting rod cap x Connecting rod 1st 25 250 18
2nd Turn 905
Rear oil seal retainer x Cylinder block 7.8 80 69 in.Vlbf
Water seal plate x Cylinder block 14 145 10
Generator bracket x Cylinder block 18 185 13
Oil pump x Cylinder block 12 mm head 16 160 12
14 mm head 30 310 22
No.1 oil pan x Cylinder block 10 mm head 7.8 80 69 in. Vlbf
12 mm head1818513
No.1 oil pan x Oil pump

7.8

80

69 in. Vlbf No.1 oil pan x Rear oil seal retainer 7.8 80 69 in. Vlbf Oil strainer x Cylinder block 7.8 80 69 in. Vlbf Oil strainer x Oil pump 7.8 80 69 in. Vlbf Oil pan baffle plate x No.1 oil pan 7.8 80 69 in. Vlbf No.1 oil pan x No.2 oil pan 7.8 80 69 in. Vlbf
Water pump x Cylinder block 18 185 13
Water bypass pipe x Cylinder Block 18 185 13
Knock sensor x Cylinder block 44 450 33
Starter x Cylinder block 39 400 29
Engine mounting bracket x Cylinder block 37 380 27
Drive plate x Crankshaft 98 1,000 72
Transmission x Cylinder block 57 580 42
Transmission x No.1 oil pan 39 400 29
Drive plate x Torque converter3334025 Transmission oil cooler pipe x Transmission for union nut 34 350 25 Rear engine mounting member x Body 25 250 19\
\
Rear engine mounting member x Rear engine mounting insulator1313510
EG±210±
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Page 1375 of 4087

$LEXUS SC300 1991 Service Repair Manual \ \ Front suspension crossmember x Engine mounting insulator 59 600 43 \ \ PS$

\
\

Front suspension crossmember x Engine mounting insulator 59 600 43
\
\
PS pump x Cylinder head for bolt 39 400 29
\
\
for nut 43 440 32
\
\
Propeller shaft x Transmission 79 805 58\
\

Propeller shaft x Differential

79

805

58\
\

Propeller shaft x Body

37

375

27\
\
Center floor crossmember brace x Body 13 130 9\
\
Fuel inlet hose x Fuel tube 30 310 22\
\
TWC (Front) x Exhaust manifold 62 530 46\
\
Front exhaust pipe x TWC (Front) 43 440 32\
\
Front exhaust pipe support bracket x Transmission 43 440 32\
\
Front exhaust pipe x Center Exhaust pipe 43 440 32\
\
Center exhaust pipe x Tailpipe 44 195 14
\
\
Main heated oxygen Exhaust manifold 44 450 33
\
\
Sub heated oxygen sensor x Front exhaust pipe 44 450 33
±
1UZ ± FE ENGINE ENGINE MECHANICALEG±211
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Page 1376 of 4087

LEXUS SC300 1991 Service Repair Manual
1UZ±FE ENGINE
EG±1
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