1991 LEXUS SC400 light

11. INSTALL LH CAMSHAFT TIMING PULLEY
(a) Align the camshaft knock pin with the knock pin groove of the
timing pulley, and slide on the timing pulley.
(b) Slide the timing pulley on the camshaft, facing the ªLº mark
forward.
(c) Using SST, install the pulley bolt. SST 09278±54012
Torque: 108 N Vm (1,100 kgf Vcm, 80 ft Vlbf)
12. SET NO.1 CYLINDER TO TDC/COMPRESSION
(a) Crankshaft Pulley Position:
Turn the crankshaft pulley, and align its groove with timing
mark ª0º of the No. 1 timing belt cover.
(b) (Camshaft Timing Pulley Position) Using SST, turn the camshaft timing pulley, and align the tim-
ing marks of the camshaft timing pulley and timing belt rear
plate.
SST 09278±54012
13. CONNECT TIMING BELT TO LH CAMSHAFT TIMING PULLEY
(a) Align the installation mark on the timing belt with the the end
of the hydraulic pump.
(b) Remove any oil or water on the LH camshaft timing pulley, and keep it clean.
(c) Using SST, slightly turn the LH camshaft timing pulley
clockwise. Align the installation mark on the timing belt with
the timing mark of the camshaft timing pulley, and hang the
timing belt on the LH camshaft timing pulley.
SST 09278±54012
EG±62
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(d) Using SST, align the timing marks of the LH camshaft timingpulley and timing belt rear plate.
SST 09278±54012
(e) C h e c k t h a t t h e t i m i n g b e l t h a s t e n s i o n b e t w e e n t h e
crankshaft timing pulley and LH camshaft timing pulley.
14. CONNECT TIMING BELT TO RH CAMSHAFT TIMING PULLEY
(a) Remove any oil or water on the RH camshaft timing pulley
and water pump pulley, and keep them clean.
(b) Using SST, slightly turn the RH camshaft timing pulley clockwise. Align the installation mark on the timing belt with
the timing mark of the camshaft timing pulley, and hang the
timing belt on the RH camshaft timing pulley.
SST 09278±54012
(c) Using SST, align the timing marks of the RH camshaft timing pulley and timing belt rear plate.
SST 09278±54012
(d) Check that the timing belt has tension between the RH camshaft timing pulley and LH camshaft timing pulley.
15. SET TIMING BELT TENSIONER
(a) Using a press, slowly press in the push rod using 981 ± 9,807
N (100 ± 1,000 kgf, 220 ± 2,205 lbf) of force.
(b) Align the holes of the push rod and housing, pass a 1.27 mm hexagon wrench through the holes to keep the setting
position of the push rod.
(c) Release the press.
(d) Install the dust boot to the belt tensioner.
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37. INSTALL AIR CONDITIONING (A/C) COMPRESSOR
(a) Install the A/C compressor, compressor stay and groundcable with the nut and 3 bolts.
Torque:
49 NVm (500 kgf Vcm, 36 ft Vlbf) for bolt
29 N Vm (300 kgf Vcm, 22 ft Vlbf) for nut
(b) Connect the A/C compressor connector.
38. INSTALL RADIATOR ASSEMBLY
(a) Install the 2 lower radiator supports to the radiator.
(b) Place the radiator assembly on the body bracket.
(c) Slightly lift the radiator, and connect the 2 oil cooler hoses (for
cooling fan) to the hose clamp on the radiator fan shroud.
(d) Install the upper radiator support with the 2 bolts and screw. Install the 2 upper radiator supports.
Torque: 12 N Vm (120 kgf Vcm, 9 ft Vlbf)
EG±70±
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(d) Check the valve overall length.
Standard overall length:Intake94.95 mm (3.7382 in.)
Exhaust 96.90 mm (3.8150 in.)
Minimum overall length:
Intake94.45 mm (3.7185 in.)
Exhaust 96.40 mm (3.7953 in.)
If the overall length is less than minimum, replace the valve.
(e) Check the surface of the valve stem tip for wear. If the valve stem tip is worn, resurface the tip with a grinder
or replace the valve.
NOTICE: Do not grind off more than minimum.
8. INSPECT AND CLEAN VALVE SEATS
(a) Using a 45
carbide cutter, resurface the valve seats.
Remove only enough metal to clean the seats.
(b) Check the valve seating position. Apply a light coat of prussian blue (or white lead) to the valve
face. Lightly press the valve against the seat. Do not rotate
valve.
(c) Check the valve face and seat for the following: wIf blue appears 360
around the face, the valve is
concentric. If not, replace the valve.
w If blue appears 360
around the valve seat, the guide
and face are concentric. If not, resurface the seat.
w Check that the seat contact is in the middle of the valve
face with the following width:
1.0 ± 1.4 mm (0.039 ± 0.055 in.)
If not, correct the valve seats as follows:
(1) If the seating is too high on the valve face, use 30 5 and 45 5
cutters to correct the seat.
EG±100
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16. IF NECESSARY, REPLACE SPARK PLUG TUBEGASKETS
(a) Bend the ventilation case claw installed on the cylinder head
cover to an angle of 90
or more.
(b) Using SST and a hammer, tap out the gasket. SST 09550±10012 (09552±10010, 09560±10010)
(c) Using SST and a hammer, tap in a new gasket until its surface
is flush with the upper edge of the cylinder head cover.
SST 09550±10012 (09552±10010, 09560±10010)
(d) Apply a light coat of MP grease to the gasket lip.
(e) Return the ventilation case claw to its original position.
CYLINDER HEAD ASSEMBLY
EG1KN±02
(See Components for Removal and Installation) HINT:
wThoroughly clean all parts to be assembled.
w Before installing the parts, apply new engine oil to all
sliding and rotating surfaces.
w Replace all gaskets and oil seals with new ones.
1. INSTALL SPARK PLUG TUBES HINT: When using a new cylinder head, spark plug tubes
must be installed.
(a) Apply adhesive to the end of the spark plug tube.
Adhesive:
Part No. 08833±00070, THREE BOND 1324 or equivalent
(b) Using a wooden block and hammer, tap in a new spark tubeuntil there is 48.7 ± 49.3 mm (1.917 ± 1.941) protruding from
the camshaft bearing cap installation surface of the cylinder
head.
NOTICE: Avoid tapping a new spark plug tube in too far
by measuring the amount of the protrusion while tap-
ping.
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2. INSTALL VALVES
(a) Using SST, push in a new oil seal.SST 09201±41020
(b) Install the following parts: (1) Valve
(2) Spring seat
(3) Valve spring
(4) Spring retainer
(c) Using SST, compress the valve spring and place the 2 keepers around the valve stem.
SST 09202±70010
(d) Using a plastic±faced hammer, lightly tap the valve stem tip to assure proper fit.
3. INSTALL VALVE LIFTERS AND SHIMS
(a) Install the valve lifter and shim.
(b) Check that the valve lifter rotates smoothly by hand.
EG±108
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B. Install cylinder head boltsHINT:
wThe cylinder head bolts are tightened in 2 progressive
steps (steps (c) and (e)).
w If any cylinder head bolt is broken or deformed, replace
it.
(a) Apply a light coat of engine oil on the threads and under the
heads of the cylinder head bolts.
(b) Install the plate washer to the cylinder head bolt.
(c) Install and uniformly tig hten the 10 cylinder head bolts on one
side of the cylinder head in several passes in the sequence
shown, then do the other side as shown.
Torque: 39 N Vm (400 kgf Vcm, 29 ft Vlbf)
If any one of the cylinder head bolts does not meet the torque
specification, replace the cylinder head bolt.
NOTICE: Do not drop the plate washer for cylinder head bolt
into portion A of the cylinder head. If dropped into portion A,
the plate washer will pass through the cylinder head and cylin-
der block into the oil pan.
(d) Mark the front of the cylinder head bolt head with paint.
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(d) RH Cylinder Head:Install the bearing cap (mark ª11º) in position with the arrow
mark facing rearward.
(e) LH Cylinder Head: Install the bearing cap (mark ª16º) in position with the arrow
mark facing forward.
(f) Install a new seal washer to the bearing cap bolt.
(g) Apply a light coat of engine oil on the threads of the bearing
cap bolt.
(h) Install the 4 bearing cap bolts. Alternately tighten bearing cap bolts.
Torque: 16 N Vm (160 kgf Vcm, 12 ft Vlbf)
HINT: Use silver colored bolts 38 mm (1.50 in.) in length.
6. ASSEMBLE EXHAUST CAMSHAFT
(a) Install the following parts: (1) Camshaft gear spring
(2) Camshaft sub±gear
(3) Wave washer
HINT: Align the pins on the gears with the spring ends.
(b) Using snap ring pliers, install the snap ring.
(c) Mount the hexagon wrench head portion of the camshaft in a vise.
NOTICE: Be careful not to damage the camshaft.
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