1991 LEXUS SC400 Service Repair Manual

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Page 2377 of 4087

LEXUS SC400 1991 Service Repair Manual
31. INSTALL THROTTLE BODY COVERInstall the throttle body cover and hose clamp with the two
bolts and cap nut.
32. INSTALL DRIVE BELT Install the drive belt by turning the drive belt tensioner coun-

Page 2378 of 4087

LEXUS SC400 1991 Service Repair Manual
SERVICE SPECIFICATIONS
SERVICE DATA
Engine tune±up Battery specific gravity 1.27±1.29 g

SERVICE SPECIFICATIONS
SERVICE DATA
Engine tune±up Battery specific gravity 1.27±1.29 g (when fully charged at 205C (68 5F)) High±tension cord resistance Limit 25 k per cord Valve clearance Intake 0.15 ± 0.25 mm 0.006 ± 0.010 in. Exhaust 0.25 ± 0.35 mm 0.010 ± 0.014 in.
Ignition timing 8±12 5 BTDC @ idle
(w/ Terminals TE1 and E1 connected)
Idle speed 700 + 50 rpm

Intake
manifold

at Idle speed

60 kPa 450 mmHg 17.7 in.Hg
vacuum vacuum
Compressionat 250 rpmSTD1,226 kPa (12.5 kgf/cm, 178 psi) or more pressure Limit 981 kPa 10.0 kgf/cm 142 psi Difference of pressure between each cylinder 98 kPa (1.0 kgf/cm, 14 psi) or less Timing belt ten- Protrusion from housing end 10.5 ± 11.5 mm 0.413 ± 0.453 in. g
sioner g
Cylinder head Warpage Cylinder block side Limit 0.10 mm 0.0039 in.

y
Manifold side Limit 0.10 mm 0.0039 in.
Valve seat Refacing angle 30
5, 45 5, 75 5
Contacting angle 455
Contacting width1.0 ± 1.4 mm0.039 ± 0.055 in. Cylinder head bolt thread outside diam4eter
STD 9.770 ± 9.960 mm 0.3846 ± 0.3921 in. Limit 9.60 mm 0.3780 in. Valve guide Inside diameter 6.010 ± 6.030 mm 0.2366 ± 0.2374 in.

g
bushing Outside diameter (for repair part) STD 11.048 ± 11.059 mm 0.4350 ± 0.4354 in.

g
O/S 0.05 11.098 ± 11.109 mm 0.4369 ± 0.4374 in.
Valve Valve overall length STD Intake 94.95 mm 3.7382 in.
Exhaust 96.90 mm 3.8150 in.
LimitIntake94.45 mm3.7185 in. Exhaust 96.40 mm 3.7953 in. Valve face angle 44.5 5 Stem diameter Intake 5.970 ± 5.985 mm 0.2350 ± 0.2356 in. Exhaust 5.965 ± 5.980 mm 0.2356 ± 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.
Exhaust0.10 mm0.0039 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. g 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±1.2195 in.
Lifter bore diameter 31.000±31.016 mm 1.2205±1.2211 in.
Oil clearanceSTD0.024±0.050 mm0.0009±0.0020 in. Limit 0.07 mm 0.0028 in.
EM±178±
ENGINE MECHANICAL Service Specifications
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Page 2379 of 4087

LEXUS SC400 1991 Service Repair Manual
SERVICE DATA (Contd)
Camshaft Thrust clearance STD 0.040±0.090 mm 0.0016±0.0035 in.

SERVICE DATA (Cont'd)
Camshaft Thrust clearance STD 0.040±0.090 mm 0.0016±0.0035 in.
Limit 0.12 mm 0.0047 in.
Journal oil clearance
STD Exhaust camshaft thrust portion 0.025±0.061 mm 0.0010±0.0024 in.
Others 0.030±0.067 mm 0.0012±0.0026 in.
Limit0.10 mm0.0039 in. Journal diameter
Exhaust camshaft thrust portion 23.959±23.975 mm 0.9433±0.9439 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 backlash STD 0.020±0.200 mm 0.0008±0.0079 in.
Limit0.30 mm0.0188 in. Camshaft gear spring end free distance 18.2±18.8 mm 0.712±0.740 in. Manifold Warpage Limit Intake 0.15 mm 0.0059 in. Exhaust 1.00 mm 0.0394 in. Air intake Warpage Limit 0.15 mm 0.0059 in. chamber
Cylinder block Cylinder head surface warpage Limit 0.07 mm 0.0028 in.
Cylinder bore diameter STD 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.
Limit 87.73 mm 3.4539 in.
Main bearing cap stud bolt
tension portion diameterSTD7.500±7.600 mm0.2953±0.2992 in.
Limit

7.40 mm

0.2913 in. Piston and Piston diameter Mark 1 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 in.
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.
LimitNo.11.05 mm0.0413 in. No.2 1.20 mm 0.0472 in. Oil 1.10 mm 0.0433 in.
±
ENGINE MECHANICAL Service SpecificationsEM±179
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Page 2380 of 4087

LEXUS SC400 1991 Service Repair Manual
SERVICE DATA (Contd)
Connecting rod Thrust clearance STD 0.160±0.330 mm 0.0063±0.0114 in.

SERVICE DATA (Cont'd)
Connecting rod Thrust clearance STD 0.160±0.330 mm 0.0063±0.0114 in.
Limit 0.35 mm 0.138 in.
Connecting rod thickness 22.880±22.920 mm 0.9008±0.9024 in.
Connecting rod bearing center wall thickness
Mark 2 1.484±1.487 mm 0.0584±0.0585 in.
Mark 31.487±1.490 mm0.0585±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 bending 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.
Connecting rod bushing inside diameter 22.005±22.017 mm 0.8663±0.8668 in.
Piston pin diameter21.997±22.009 mm0.8660±0.8665 in. Connecting rod bushing oil clearance STD 0.005±0.011 mm 0.0002±0.0004 in. Limit 0.05 mm 0.0020 in. Connecting rod tension portion diameter
STD 7.200±7.300 mm 0.2835±0.2874 in. Limit 7.00 mm 0.2756 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 STD 2.440±2.490 mm 0.0961±0.0980 in.
Main journal bore diameter on cylinder block 67.026±67.033 mm 2.6388±2.6391 in.
(with main bearing)
Main journal oil clearanceSTD0.026±0.045 mm0.0010±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 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 0.08 mm 0.0031 in.
Main journal taper and out±of±round Limit 0.02 mm 0.0008 in.
Crank pin taper and out±of±roundLimit0.02 mm0.0008 in.
EM±180±
ENGINE MECHANICAL Service Specifications
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Page 2381 of 4087

$LEXUS SC400 1991 Service Repair Manual TORQUE SPECIFICATIONS \ \ Part tightened NVm kgf Vcm ft Vlbf No.1 idler pulley X Cylinder$

TORQUE SPECIFICATIONS
\
\
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 12 mm head 16 160 12 14 mm head 30 310 22
Crankshaft pulley X Crankshaft 245 2,500 181
Camshaft timing pulley X Camshaft1081,10080 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
Alternator X Alternator bracket3738027 Alternator X Cylinder block 37 380 27 Distributor housing X Cylinder head 18 185 13
Distributor rotor X Distributor housing 3.8 39 34 in. Vlbf
Distributor cap X Camshaft timing pulley 3.839 34 in. Vlbf\
\
RH No.2 timing belt cover X Cylinder block (for 12 mm head) 16 160 12 Drive belt idler pulley X Hydraulic pump 37 380 27
A/C compressor X Hydraulic pump 49 500 36
A/C compressor X Cylinder block4950036 A/C compressor stay X Oil filter bracket 29 300 22 Exhaust manifold X Cylinder head 39 400 29
Main oxygen sensor X Exhaust manifold 44 450 33
Cylinder head X Cylinder block1st3940029 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 Exhaust manifold 18 185 13 Rear water by±pass joint X Cylinder head 18 185 13
Front water by±pass joint X Cylinder head 18 185 13
Intake manifold X Cylinder head1818513 Delivery pipe X Intake manifold 18 185 13\
\
Fuel return pipe X RH delivery pipe(for union bolt) 35 360 26
Fuel inlet hose X LH delivery pipe 39 400 29
for SST3334024 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 head1818513 Cold start injector tube X RH delivery pipe 15 150 11 Brake booster union X Air intake chamber 29 300 22
Throttle body X Air intake chamber 18 185 13
ISC valve X Air intake chamber1818513 EGR valve adapter X Air intake chamber 18 185 13 EGR valve X EGR valve adapter 18 185 13
Timing belt rear plate X Cylinder head 7.8 80 69 in. Vlbf
Water inlet housing X Water pump1818513\
\
Catalytic converter (main) X Exhaust manifold 62 630 46\
\
Catalytic converter (main) X Front exhaust pipe 43 440 32
\
\
Front exhaust pipe support bracket X Transmission 43 440 32
PS pump X RH cylinder headBolt3940029 Nut 43 440 32 Main bearing cap X Cylinder block Nut 1st 27 275 20
2nd Turn 90 5
Bolt4950036
±
ENGINE MECHANICAL Service SpecificationsEM±181
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Page 2382 of 4087

$LEXUS SC400 1991 Service Repair Manual TORQUE SPECIFICATIONS (Contd) \ \ Part tightened NVm kgf Vcm ft Vlbf Connecting rod cap$

TORQUE SPECIFICATIONS (Cont'd)
\
\
Part tightened NVm kgf Vcm ft Vlbf
Connecting rod cap X Connecting rod 1st 25 250 18
2ndTurn 90 5 Rear oil seal retainer X Cylinder block 7.8 80 69 in. Vlbf Water seal plate X Cylinder block 14 145 10
Alternator bracket X Cylinder block 18 185 13
Oil pump X Cylinder block 12 mm head 16 160 12
14 mm head3031022 Water pump X Cylinder block 18 185 13 Water by±pass 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 block3738027 Drive plate X Crankshaft 98 1,000 72 A/T oil cooler pipe X Transmission 34 350 25 Rear engine mounting member X Body 25 260 19
\
\
Rear engine mounting member X Engine mounting insulator 13 135 10
\
\
Front engine mounting insulator X Suspension crossmember 59 600 43
Center floor brace X Body131309 Tailpipe X Center exhaust pipe 43 440 32 Front exhaust pipe X Center exhaust pipe 43 440 32
Sub±oxygen sensor X Front exhaust pipe 44 450 33
EM±182±
ENGINE MECHANICAL Service Specifications
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Page 2383 of 4087

LEXUS SC400 1991 Service Repair Manual
EXHAUST SYSTEM
NOTE: The specification descriptions ºUSA Spec.º and
º Exc. USA Spec. º used in this section indicate the following
specifications.
USA Spec .: USA (50 States) Specifications.
Exc.

Page 2384 of 4087

LEXUS SC400 1991 Service Repair Manual
COMPONENTS
EXHAUST PIPES AND HEAT INSULATORS
EX±2±
EXHAUST SYSTEM Exhaust Pipes and Heat Insulators
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