LEXUS SC400 1991 Service Repair Manual

(b) Remove SST.
(c) Insert the yoke into the transmission.
(d) Align the matchmarks and install the propeller shaft on thedifferential with the 3 bolts, washers and nuts.
NOTICE: Bolts should be inserted from the propeller
shaft side.
Torque: 79 N Vm (805 kgf Vcm, 58 ft Vlbf)
If using a new propeller shaft (w/ Phasemarks)
Install the propeller shaft phasemarks and differential phase-
marks so that their respective alignment phasemarks match.
If the propeller shaft phasemarks and differential phase-
marks do not align, install the propeller shaft and differential
alignment phasemarks are as close together as possible.
(w/o Phasemarks)
Install the propeller shaft.
(See page PR±28)
±
PROPELLER SHAFT PROPELLER SHAFTPR±29
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(f) Temporarily install the center support bearing set bolts withthe adjusting washers.
HINT: Use the adjusting washers which were removed.
(g) Torque the center support bearing set bolts.
Torque: 49 N Vm (500 kgf Vcm, 36 ft Vlbf)
HINT: Adjust the center support bearing to keep the intervals,
as shown with the vehicle in the unladen condition.
Under the same condition, check if the center line of the cen-
ter support bearing is at right angles to the shaft axial direc-
tion.
2. INSPECT JOINT ANGLE (See page PR±32)
NOTICE: The joint angle should by all means be checked
when the propeller shaft is removed and installed.
3. INSTALL CROSSMEMBER BRACE Install the center floor crossmember brace and torque the 4
bolts.
Torque: 13 N Vm (130 kgf Vcm, 9 ft Vlbf)
4. INSTALL HEAT INSULATOR
Install the heat insulator and torque the 4 nuts.
Torque: 5.4 N Vm (55 kgf Vcm, 48 in. Vlbf)
5. INSTALL EXHAUST CENTER PIPE
(a) Install new gaskets.
(b) Install the exhaust center pipe.
(c) Connect the exhaust center pipe to the 2 rings.
(d) Install and torque the new 4 nuts.
Torque: 19 N Vm (195 kgf Vcm, 14 ft Vlbf)
PR±30±
PROPELLER SHAFT PROPELLER SHAFT
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6. INSTALL EXHAUST FRONT PIPE
(a) Install new gaskets.
(b) Install the front pipe.
(c) Install and torque the 4 bolts and new nuts.
Torque: 43 NVm (440 kgf Vcm, 32 ft Vlbf)
(d) Connect both oxygen sensor with heat insulator.
HINT: When connecting the oxygen sensor, turn it clockwise
about 3 times.
NOTICE: After installing the oxygen sensor, check that
the wire is not twisted.
(e) Tighten the oxygen sensors.
Torque: 44 N Vm (450 kgf Vcm, 33 ft Vlbf)
(f) Connect the oxygen sensor grommets to the floor.
±
PROPELLER SHAFT PROPELLER SHAFTPR±31
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JOINT ANGLE INSPECTION AND
ADJUSTMENT
PR034±02
NOTICE: When performing operations which involve the
removal and installation of the propeller shaft, always
check the joint.
Make adjustments if necessary.
1. STABILIZE PROPELLER SHAFT AND DIFFERENTIAL
(a) Turn the propeller shaft several times by hand to stabilize the center support bearing and flexible couplings.
(b) Using a jack, raise and lower the differential to stabilize the differential mounting cushion.
2. CHECK JOINT ANGLE OF NO.2 JOINT AND NO.3 JOINT
(a) Using SST, measure the installation angle of the intermediate
shaft and propeller shaft.
SST 09370±50010
HINT: The SST should be directly underneath the tube.
(b) Using SST, measure the installation angle of the differential. SST 09370±50010
HINT: Measure the installation angle by placing the SST in
the position, as shown in the illustration.
(c) Calculate the No.2 joint angle.
PR±32
±
PROPELLER SHAFT PROPELLER SHAFT
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No.2 joint angle:A ± B = ± 1 01'+ 36 '
A: Intermediate shaft installation angle
B: Propeller shaft installation angle
(d) Calculate the No.3 joint angle.
No.3 joint angle:
B ± C = 54 '+ 36 '
B: Propeller shaft installation angle
C: Differential installation angle
If the measure angle is not within the specification, adjust it
with the center support bearing adjusting washer, differential
mount upper stopper and adjusting shim.
  Thickness
mm (in.)\
 \
Remarks
 






Center support
bearing
 






Adjusting
washer
 






2.0 (0.079)
4.0 (0.157)
6.0 (0.236)
8.5 (0.335)
\
 
\


\


\

\

Left and right washers should be the same thickness.
2 washers should not be assembled together.
Standard parts are used 6.0 mm (0.236 in.) washers.
  Set bolt 40.0 (1.575)\
 \

 


 


Mount upper
stopper 


2.3 (0.091)
2.8 (0.110)\
 
\

\

When the vehicle is new a 2.8 mm (0.110 in.)
stopper used in assembly.
 


Differential 

Adjusting shim
 


1.0 (0.039)
1.6 (0.063)
2.0 (0.079)\
 
\

\

Left and right washers should be the same thickness.
This shim is installed on top of the mount upper
stopper and is used for adjustment.
±
PROPELLER SHAFT PROPELLER SHAFTPR±33
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ADJUSTMENT CHART
PR035±02
HOW TO READ THIS CHART
Take measurements, then calculate the No.2 and No. 3 joint
angle.
Mark the calculated values on the chart and read the coordi-
nates.
Replace the adjusting washer, shim and mount upper stop-
per in accordance with the coordinates read and adjust the
joint angles.
Example
Measurements (Installation angle):Intermediate shaft 2  2 '
Propeller shaft 2  36 '
Differential 2  12 '
Joint angle: NO.2 2  20 ' ± 2  36 ' = ± 16 '
NO.3 2  36 ' ± 2  12 ' = 24 '
Adjustment:
Center support bearing Standard parts 6.0 mm (0.236 in.) ±2.5 mm (0.098 in) =
3.5 mm (0.138 in.)
Use adjusting washers which are 2.0 mm (0.079 in.)
thicker.
Differential
Use adjusting shims which are 1.0 mm (0.039 in.)
thicker.
HINT:
wMaintain the same thickness for the adjusting washers
and adjusting shims on both the left and right sides.
w If a washer, stopper and shim of the exact thickness are
not available, use the parts which are nearest in
thickness.
NOTICE: Check the joint angle once again after making
the adjustment.
PR±34
±
PROPELLER SHAFT PROPELLER SHAFT
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±
PROPELLER SHAFT PROPELLER SHAFTPR±35
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ENGINE TUNE±UP
INSPECTION OF ENGINE COOLANT
1. INSPECT ENGINE COOLANT LEVEL AT RESERVOIRTANK
The coolant level should be above the ºCOLD LEVELº at
normal temperature (20 5C (68 5F)).
If low, check for leaks and add coolant up to the ºCOLD
LEVELº.
2. INSPECT ENGINE COOLANT QUALITY There should be any excessive deposits of rust or scales
around the radiator cap or reservoir tank filler hole, and the
coolant should be free from oil.
If excessively dirty, clean the coolant passages and replace
the coolant.
INSPECTION OF ENGINE OIL
1. INSPECT ENGINE OIL QUALITYCheck the oil for deterioration, entry of water, discoloring or
thinning.
If the quality is poor, replace the oil.
Oil grade: API grade SG, Energy±Conserving II multigrade.
Recommended viscosity is as shown, with SAE
5W±30 being the preferred engine oil.
Drain and refill oil capacity: w/ oil filter change4.8 liter (5.1 US qts, 4.2 lmp. qts)
w/o oil filter change 4.5 liter (4.8 US qts, 4.0 lmp. qts)
2. INSPECT ENGINE OIL LEVEL The oil level should be between the ºLº and ºFº marks on the
dipstick.
If low, check for leakage and add oil up to ºFº mark.
EM±8
±
ENGINE MECHANICAL Engine Tune±Up
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INSPECTION OF BATTERY
1. INSPECT BATTERY SPECIFIC GRAVITY ANDELECTROLYTE LEVEL
(a) Check the specific gravity of each cell.
Standard specific gravity:
1.27±1.29 when fully charged at 20 5C(68 5F)
If not within specification, charge the battery.
(b) Check the electrolyte quantity of each cell.
If insufficient, refill with distilled (or purified) water.
2. CHECK BATTERY TERMINALS Check that the battery terminals are not loose or corroded.
INSPECTION AND CLEANING OF AIR
FILTER
1. REMOVE AIR FILTER(a) Open the air cleaner cap.
(b) Remove the air filter.
2. INSPECT AIR FILTER (a) Visually check that the air filter is not excessivelydamaged or oily.
(b) Clean the air filter with compressed air.
First blow from the inside thoroughly, then blow off the out-
side of the air filter.
3. REINSTALL AIR FILTER
±
ENGINE MECHANICAL Engine Tune±UpEM±9
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INSPECTION OF HIGH±TENSION CORDS
1. REMOVE HIGH±TENSION CORDS (See page IG±11)
2. INSPECT HIGH±TENSION CORDS (b) Using an ohmmeter, measure the resistance.
Maximum resistance: 25 k
per cord
If the resistance is greater than maximum, replace the cord.
3. REINSTALL HIGH±TENSION CORDS (See page IG±16)
INSPECTION OF DRIVE BELT
INSPECT DRIVE BELT
HINT: A belt tensioner is used, so checking the belt tension
is not necessary.
(a) Visually check the drive belt for excessive wear, frayedcords etc.
If necessary, replace the drive belt.
HINT:
w Cracks on rib side of a drive belt are considered
acceptable. If the drive belt has chunks missing from the
ribs, it should be replaced.
w The drive belt tension can be released by turning the
belt tensioner counterclockwise. The pulley bolt for the
belt tensioner has a left±hand thread.
(b) Check the belt tensioner operation. w Check that the belt tensioner moves downward
when the drive belt is pressed down at the points
indicated in the illustration with approx. 98 N (10
kgf, 22.0 lbf) of force.
w Check the alignment of the belt tensioner pulley to
make sure the drive belt has not slipped off the
pulley.
If necessary, replace the belt tensioner. w Check that the arrow mark on the belt tensioner
falls within area A of the scale.
If it is outside area A, replace the drive belt.
HINT:
w When a new belt is installed, it should lie within area B.
If not, the drive belt is not correct.
w After installing a belt, check that it fits properly in the
ribbed grooves.
w Check by hand to confirm that the belt has not slipped
out of the groove on the bottom of the pulley.
EM±10
±
ENGINE MECHANICAL Engine Tune±Up
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