1991 LEXUS SC400 height

6. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS(a) Using SST and a hammer, tap out the guide bushing.
SST 09201±70010
(b) Using a caliper gauge, measure the bushing borediameter of the cylinder head.
(c) Select a new guide bushing (STD size or O/S 0.05).
Both intake and exhaust If the bushing bore diameter of the cylinder head is greater
than 11.044 mm (0.4348 in.), machine the bushing bore to
the following dimension:
11.035±11.056 mm (0.4344±0.4353 in.)
If the bushing bore diameter of the cylinder head is greater
than 11.056 mm (0.4353 in.), replace the cylinder head.
(d) Using SST and hammer, tap in a new guide bushing to
the specified protrusion height.
SST 09201±70010
Protrusion height:
Intake 12.3±12.7 mm (0.484±0.500 in.)
Exhaust 11.4±11.8 mm (0.449±0.465 in.)
HINT: Different bushings are used for the intake and exhaust.
±
ENGINE MECHANICAL Cylinder HeadEM±45
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B. Inspect cam lobesUsing a micrometer, measure the cam lobe height.
Standard cam lobe height:
Intake 44.570±44.670 mm (1.7547±1.7587 in.)
Exhaust 44.250±44.350 mm (1.7421±1.7461 in.)
Maximum cam lobe height: Intake 44.42 mm (1.7488 in.)
Exhaust 44.10 mm (1.7362 in.)
If the cam lobe height is less than minimum, replace the cam-
shaft.
C. Inspect camshaft journals Using a micrometer, measure the journal diameter.
Journal diameter: 28.949±28.965 mm
(1.1397±1.1404 in.)
If the journal diameter is not as specified, check the oil clear-
ance.
D. Inspect camshaft bearings Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and
cylinder head as a set.
E. Inspect camshaft journal oil clearance (a) Clean the bearing caps and camshaft journals.
(b) Place the camshafts on the cylinder head.
(c) Lay a strip of Plastigage across each of the camshaftjournals.
(d) Install the bearing caps. (See step 2 on page EM±55)
Torque: 20 N Vm (200 kgf Vcm, 14 ft Vlbf)
HINT: Do not turn the camshaft.
±
ENGINE MECHANICAL Cylinder HeadEM±49
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10. INSPECT CAMSHAFTS AND BEARINGS
A. Inspect camshaft for runout(a) Place the camshaft on V±blocks.
(b) Using a dial indicator, measure the circle runout at thecenter journal.
Maximum circle runout: 0.08 mm (0.0031 in.)
If the circle runout is greater than maximum, replace the cam-
shaft.
B. Inspect cam lobes Using a micrometer, measure the cam lobe height.
Standard cam lobe height:
Intake 41.710±41.810 mm (1.6421±1.6461 in.)
Exhaust 41.910±42.010 mm (1.6500±1.6539 in.)
Minimum cam lobe height: Intake 41.56 mm (1.6362 in.)
Exhaust 41.76 mm (1.6441 in.)
If the cam lobe height is less than minimum, replace the cam-
shaft.
C. Inspect camshaft journals Using a micrometer, measure the journal diameter.
Journal diameter:
Exhaust camshaft thrust portion (A) 23.959±23.975 mm
(0.9433±0.9439 in.)
Others 26.954±26.970 mm (1.0612±1.0618 in.)
If the journal diameter is not as specified, check the oil clear-
ance.
D. Inspect camshaft bearings Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and
cylinder head as a set.
±
ENGINE MECHANICAL Cylinder HeadsEM±85
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10. INSPECT CAMSHAFTS AND BEARINGS
A. Inspect camshaft for runout(a) Place the camshaft on V±blocks.
(b) Using a dial indicator, measure the circle runout at thecenter journal.
Maximum circle runout: 0.08 mm (0.0031 in.)
If the circle runout is greater than maximum, replace the cam-
shaft.
B. Inspect cam lobes Using a micrometer, measure the cam lobe height.
Standard cam lobe height:
Intake 41.710±41.810 mm (1.6421±1.6461 in.)
Exhaust 41.910±42.010 mm (1.6500±1.6539 in.)
Minimum cam lobe height: Intake 41.56 mm (1.6362 in.)
Exhaust 41.76 mm (1.6441 in.)
If the cam lobe height is less than minimum, replace the cam-
shaft.
C. Inspect camshaft journals Using a micrometer, measure the journal diameter.
Journal diameter:
Exhaust camshaft thrust portion (A) 23.959±23.975 mm
(0.9433±0.9439 in.)
Others 26.954±26.970 mm (1.0612±1.0618 in.)
If the journal diameter is not as specified, check the oil clear-
ance.
D. Inspect camshaft bearings Check the bearings for flaking and scoring.
If the bearings are damaged, replace the bearing caps and
cylinder head as a set.
±
ENGINE MECHANICAL Cylinder HeadsEM±85
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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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Maximum clearance:0.07 mm (0.0028 in.)
If more than maximum, replace the entire power steering
pump.
2. INSPECT ROTOR AND VANE PLATES
(a) Using a micrometer, measure the height, thickness and length of the vane plates.
Minimum height:
8.0 mm (0.315 in.)
Minimum thickness: 1.77 mm (0.0697 in.)
Minimum length:
14.97 mm (0.5894 in.)
(b) Using a feeler gauge, measure the clearance between therotor groove and vane plate.
Maximum clearance:
0.03 mm (0.0012 in.)
If more then maximum, replace the vane plate and/or rotor
with one having the same mark stamped on the cam ring.
Inscribed mark:1, 2, 3, 4 or None
HINT: There are 5 vane lengths with the following rotor and
cam ring marks:
 Rotor and camring number Vane length mm (in.)
 None 14.996±14.998 (0.59039±0.59047) 1 14.994±14.996 (0.59031±0.59039) 2 14.992±14.994 (0.59023±0.59031)
 3 14.990±14.992 (0.59016±0.59024)
 4 14.988±14.990 (0.59007±0.59016)
3. INSPECT FLOW CONTROL VALVE
(a) Coat the valve with power steering fluid and check that it falls smoothly into the valve hole by its own weight.
SR±124
±
STEERING POWER STEERING
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SERVICE SPECIFICATIONS
SERVICE DATA
SR0GP±01\
 \
Steering wheel freeplay Maximum\
\
30 mm (1.18 in.)
\
 \
STEERING COLUMN\
\
\
 \
Pawl stopper Mark\
\
\
 \
1 or A\
\
12.68±12.74 mm (0.4992±0.5016 in.)
\
 \
2 or B\
\
12.61±12.67 mm (0.4965±0.4988 in.)
\
 \
3 or C\
\
12.54±12.60 mm (0.4937±0.4961 in.)
\
 \
4 or D\
\
12.47±12.53 mm (0.4909±0.4933 in.)
\
 \
5 or E\
\
12.40±12.46 mm (0.4882±0.4906 in.)
\
 \
6 or F\
\
12.33±12.39 mm (0.4854±0.4878 in.)
\
 \
7 or G\
\
12.26±12.32 mm (0.4827±0.4850 in.)
\
 \
PS ON±VEHICLE INSPECTION\
\
\
 \
Maximum rise of oil level\
\
Below 5 mm (0.20 in.)
\
 \
Oil pressure at idle speed with valve closed Minimum\
\
7,355±7,845 kPa (75±80 kgf/cm2, 1,067±1,137 psi)
\
 \
Steering effort at idle speed Maximum\
\
40 N (4.1 kgf, 9.0 lbf)
\
 \
PS PUMP\
\
\
 \
Rotor shaft bushing oil clearance (SC 400) STD\
\
0.01±0.03 mm (0.0004±0.0012 in.)
\
 \
Rotor shaft bushing oil clearance (SC 400) Maximum\
\
0.07 mm (0.0028 in.)
\
 \
Rotor shaft bushing oil clearance (SC 300) STD\
\
0.03±0.05 mm (0.0012±0.0020 in.)
\
 \
Rotor shaft bushing oil clearance (SC 300) Maximum\
\
0.07 mm (0.0028 in.)
\
 \
Vane plate to rotor groove clearance (SC 400)\
\
0.03 mm (0.0012 in.) or less
\
 \
Vane plate to rotor groove clearance (SC 300)\
\
0.04 mm (0.0016 in.) or less
\
 \
Vane plate length (SC 400) Minimum\
\
14.97 mm (0.5894 in.)
\
 \
Vane plate height (SC 400) Minimum\
\
8.0 mm (0.315 in.)
\
 \
Vane plate thickness (SC 400) Minimum\
\
1.77 mm (0.0697 in.)
\
 \
Vane plate length (SC 300) Minimum\
\
14.97 mm (0.5894 in.)
\
 \
Vane plate height (SC 300) Minimum\
\
8.5 mm (0.335 in.)
\
 \
Vane plate thickness (SC 300) Minimum\
\
1.37 mm (0.0539 in.)
\
 \
Vane plate length (SC 400) Rotor and cam ring mark\
\
\
 \
NONE\
\
14.996±14.998 mm (0.59039±0.59047 in.)
\
 \
1\
\
14.994±14.996 mm (0.59031±0.59039 in.)
\
 \
2\
\
14.992±14.994 mm (0.59023±0.59031 in.)
\
 \
3\
\
14.990±14.992 mm (0.59016±0.59024 in.)
\
 \
4\
\
14.988±14.990 mm (0.59007±0.59016 in.)
\
 \
Vane plate length (SC 300) Rotor and cam ring mark\
\
\
 \
NONE\
\
14.999±15.001 mm (0.59051±0.59059 in.)
\
 \
1\
\
14.997±14.999 mm (0.59043±0.59051 in.)
\
 \
2\
\
14.995±14.997 mm (0.59035±0.59043 in.)
\
 \
3\
\
14.993±14.995 mm (0.59027±0.59035 in.)
\
 \
4\
\
14.991±14.993 mm (0.59020±0.59027 in.)
±
STEERING SERVICE SPECIFICATIONSSR±169
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WHEEL ALIGNMENT
FRONT WHEEL ALIGNMENT
SA19Z±01
1. MEASURE VEHICLE HEIGHTFront vehicle height (SC400):
 Tire size Front P225/55R16194.4 mm (7.654 in.)
Front vehicle height (SC300):
 Tire size Front P215/60R15190.4 mm (7.496 in.)
Measuring point:
Measure from the ground to the center of the lower suspen-
sion arm front mounting bolt.
NOTICE: Before inspecting the wheel alignment, adjust
the vehicle height to specification.
If the vehicle height is not standard, try to adjust it by pushing
down on or lifting the body.
2. INSTALL CAMBER±CASTER±KINGPIN GAUGE OR ONTO WHEEL ALIGNMENT TESTER
Follow the specific instructions of the equipment manufactur-
er.
3. INSPECT CAMBER, CASTER AND STEERING AXIS INCLINATION
Specifications:
 

Camber
Left±right error 

0
01 ' + 45 '
30 ' or less
 

Caster
Left±right error256 ' + 45 '
30 ' or less
 


Steering axis inclination
Left±right error 


8
58 ' + 45 '
30 ' or less
If the steering axis inclination is not as specified, after camber
and caster have correctly adjusted, recheck the steering
knuckle front wheel for bearing or looseness.
4. INSPECT TOE±IN
Toe±in (total): A + B 0.1  + 0.2 
C±D 1 + 2 mm (0.04 + 0.08 in.)
If toe±in is not within specification adjust by the tie rod end.
±
SUSPENSION AND AXLE WHEEL ALIGNMENTSA±5
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