1991 LEXUS SC300 weight

INSPECTION OF OIL PUMP
1. INSPECT RELIEF VALVECoat the valve with engine oil and check that it falls smoothly
into the valve hole by its own weight.
If it doesn't, replace the relief valve. If necessary, replace the
oil pump assembly.
2. INSPECT DRIVE AND DRIVEN ROTORS
A. Place drive and driven rotors into oil pump body Face the mark of the rotors upward.
B. Inspect rotor tip clearance Using a feeler gauge, measure the clearance between the
drive and driven rotors.
Standard tip clearance: 0.110±0.240 mm
(0.0043±0.0094 in.)
Maximum tip clearance: 0.35 mm (0.0138 in.)
If the tip clearance is greater than maximum, replace the ro-
tors as a set.
C. Inspect rotor side clearance Using a feeler gauge and precision straight edge, measure
the clearance between the rotors and precision straight
edge.
Standard side clearance: 0.030±0.090 mm
(0.0012±0.0035 in.)
Maximum side clearance: 0.15 mm (0.0059 in.)
If the side clearance is greater than maximum, replace the ro-
tors as a set. If necessary, replace the oil pump assembly.
D. Inspect rotor body clearance Using a feeler gauge, measure the clearance between the
driven rotor and pump body.
Standard body clearance: 0.100±0.175 mm
(0.0039±0.0069 in.)
Maximum body clearance: 0.30 mm (0.0118 in.)
If the body clearance is greater than maximum, replace the
rotors as a set. If necessary, replace the oil pump assembly.
E. Remove drive and driven rotors
±
LUBRICATION SYSTEM Oil PumpLU±13
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12. REMOVE SPOOL VALVE(a) Using a 10 mm hexagon wrench, remove the end plugand following parts:
(1) Spool valve
(2) Compression spring
(3) Spool sleeve
(b) Remove the O±ring from the end plug.
INSPECTION OF HYDRAULIC PUMP
1. CLEAN DISASSEMBLED PARTS Using a cleaner and compressed air, clean the disassembled
parts.
CAUTION: Thoroughly clean the oil passages of the rear
housing. Oil passage A includes a filter which should be
cleaned carefully.
2. INSPECT SPOOL VALVE (a) Coat the spool valve with PS fluid, and check that it falls
smoothly into the spool sleeve by its own weight.
(b) Check the spool valve for leakage. Close one of the holes and apply compressed air
392±490 kPa (4±5 kgf/cm2, 57±71 psi) into the opposite
side, check that air does not come out of the end hole.
If it doesn't, replace the spool valve and sleeve as a set.
3. INSPECT SPOOL COMPRESSION SPRING Using a vernier calipers, measure the free length of the com-
pression spring.
Free length: 45.8 mm (1.803 in.)
If the free length is not as specified, replace the compression
spring.
CO±34
±
COOLIING SYSTEM Electronically Controlled Hydraulic
Cooling Fan (Hydraulic Pump)
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The 1 UZ±FE engine has 8±cylinders in a V±arrangement at a bank an\
gle of 905. From the front of the RH
bank cylinders are numbered 2±4±6±8, and from the front of the LH b\
ank cylinders are numbered 1 ±3±5±7.
The crankshaft is supported by 5 bearings specified by the inside of the cr\
ankcase. These bearings are made
of a copper and lead alloy. The crankshaft is integrated with 8 weights which are cast along with it\
for balancing. Oil holes are built
into the center of the crankshaft for supplying oil to the connecting ro\
ds, pistons and other components. The ignition order is 1±8±4±3±6±5±7±2. The cylinder\
head is made of aluminum alloy, with a cross flow
type intake and exhaust layout and with pent±roof type combustion chambers. The spark plugs are loca\
ted in
the center of the combustion chambers.
At the front and rear of the intake manifold, a water passage has been p\
rovided which connects the RH
and LH cylinder heads. Exhaust and intake valves are equipped with irregular pitch springs made\
of special valve spring carbon
steel which are capable of following no matter what the engine speed.
The RH and LH intake camshafts are driven by a single timing belt, and a ge\
ar on the intake camshaft en-
gages with a gear on the exhaust camshaft to drive it. The camshaft jour\
nal is supported at 5 (intake) or 4 (ex-
haust) places between the valve lifters of each cylinder and on the front end of the cylinder \
head. Lubrication
of the cam journal gear is accomplished by oil being supplied through the \
oiler port in the center of the camshaft. Adjustment of the valve clearance is done by means of an outer shim type\
system, in which valve adjusting
shims are located above the valve lifters. This permits replacement of the sh\
ims without removal of the cam-
shafts. Pistons are made of high temperature±resistant aluminum alloy, and a depression is built into the piston
head to prevent interference with valves.
Piston pins are the full±floating type, with the pins fastened to neither the piston boss nor the connecting
rods. Instead, snap rings are fitted on both ends of the pins, preventing the\
pins from falling out. The No.1 compression ring is made of steel and the No.2 compression ring\
is made of cast iron. The oil
ring is m ade of a combination of steel and stainless steel. The outer diameter of\
each piston ring is slightly larger
than the diameter of the piston and the flexibility of the rings allows them\
to hug the cylinder walls when they
are mounted on the piston. Compression rings No.1 and No.2 work to prevent \
the leakage of gas from the cylin-
der and the oil ring works to scrape oil off the cylinder walls to prevent it from entering the combustion chamber. The cylinder block is made of aluminum alloy with a bank angle of 90 5. Cast iron cylinders are installed
inside the cylinder block. It has 8 cylinders which are approximately twice the length of th\
e piston stroke. The
top of each cylinder is closed off by the cylinder heads and the lower end of the cylinders becomes the crank-
case, in which the crankshaft is installed. In addition, the cylinder bl\
ock contains a water jacket, through which
coolant is pumped to cool the cylinders. The No.1 and No.2 oil pans are bolted onto the bottom of the cylinder block\
. The No.1 oil pan is made of
aluminum alloy. The No.2 oil pan is an oil reservoir made of pressed steel sheet. An o\
il level sensor is installed
in the No.1 oil pan (If the oil level drops below a set level, a warnin\
g light lights up.). A oil pan baffle plate keeps
sufficient oil in the bottom of the No.2 oil pan even when the vehicle is tilted. \
This dividing plate also prevents
the oil from making waves when the vehicle is stopped suddenly and the oil \
shifts away from the oil pump suction
pipe. Plastic region tightening bolts are used for the cylinder head, main bearing ca\
p and connecting rod.
EM±4
±
ENGINE MECHANICAL Operation
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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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3. INSTALL BRAKE CALIPERInstall the brake caliper to the steering cnuckle with the 2
bolts.
Torque: 118 N Vm (1,200 kgf Vcm, 87 ft Vlbf)
4. STABILIZE SUSPENSION
(a) Install the front wheel and jack down the vehicle.
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
(b) Bounce the vehicle up and down several times to stabilize the
suspension.
5. TORQUE ADJUSTING CAMS AND NUTS
(a) Jack up the vehicle and remove the front wheel.
(b) Support the lower arm with jack.
(c) Align the matchmarks and torque the adjusting cams and nuts with the vehicle weight on the suspension.
Torque: 226 N Vm (2,300 kgf Vcm, 166 ft Vlbf)
6. INSTALL ENGINE UNDER COVER
7. INSTALL FRONT WHEEL
Torque: 103 N Vm (1,050 kgf Vcm, 76 ft Vlbf)
8. CHECK FRONT WHEEL ALIGNMENT
(See page SA±5)
SA±44
±
SUSPENSION AND AXLE FRONT SUSPENSION
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