1991 LEXUS SC400 Service Repair Manual

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Page 1377 of 4087

LEXUS SC400 1991 Service Repair Manual
EG10Y±03
ENGINE MECHANICAL
DESCRIPTION
The 1 UZ±FE engine is a V±8, 4.0 liter DOHC 32±valve engine.
OPERATION
EG21L±01
EG±2±
1UZ±FE ENGINE ENGINE MECHANICAL
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Page 1379 of 4087

LEXUS SC400 1991 Service Repair Manual
±
1UZ±FE ENGINE ENGINE MECHANICALEG±3
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Page 1380 of 4087

$LEXUS SC400 1991 Service Repair Manual The 1 UZ±FE engine has 8±cylinders in a V±arrangement at a bank an\ gle of 905. From the front of the RH bank cylinders are numbered 2 ± 4 ± 6 ± 8, and from the front of t\ he LH bank cylinder$

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 t\
he LH bank cylinders are 1 ± 3 ± 5 ± 7.
The crankshaft is supported by 5 bearings inside the crankcase. These beari\
ngs are made of a copper and
lead alloy.
The crankshaft is integrated with 8 weights for balance. Oil holes are plac\
ed in the center of the crankshaft
to supply oil to the connecting rods, bearing, pistons and other component\
s.
The ignition order is 1 ± 8 ± 4 ± 3 ± 6 ± 5 ± 7 ± 2. T\
he cylinder head is made of alminum alloy, with a cross
flow type intake and exhaust layout and with pent±roof type combustion chambers. The spark plugs are
located 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 functioning at all engine speeds.
The RH and LH intake camshaft are driven by a timing belt, and a gear on\
the intake camshaft engages
with a gear on the exhaust camshaft to drive it. The cam journal is supp\
orted at 5 (intake) or 4 (exhaust)
places between the valve lifters of each cylinder and on the front end o\
f the cylinder head. Lubrication of
the cam journals and gears is accomplished by oil being supplied through th\
e 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
camshafts.
Pistons are made of high temperature±resistant aluminum alloy, and a depression is built into the piston
head to prevent interference with the 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 made of a combination of steel and stainless steel. The outer diamet\
er 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 gas leakage from
the cylinder and the oil ring works to scrape oil off the cylinder walls to prevent it from entering the combus-
tion chambers.
The cylinder block is made of aluminum alloy with a bank of 90 5. Cast iron cylinders are installed inside
the cylinder block. It has 8 cylinders which are approximately twice the le\
ngth of the piston stroke. The top
of each cylinder is closed off by the cylinder head and the lower end of the cylinders becomes the crank-
case, in which the crankshaft is installed. In addition, the cylinder block c\
ontains 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 bl\
ock. 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 oil level drops below a set level, a warning light\
s up.). And oil pan baffle plate
keeps sufficient oil in the bottom of the No.2 oil pan even when the vehicle is t\
ilted. This dividing plate also
prevents the oil from marking waves when the vehicle is stopped suddenly\
and the oil shifts away from the
oil pump suction pipe.
Plastic region tighten bolts are used for the cylinder head, main bearin\
g cap and connecting rod.
EG±4
±
1UZ±FE ENGINE ENGINE MECHANICAL
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Page 1381 of 4087

LEXUS SC400 1991 Service Repair Manual
PREPARATION
EG0AY±0M
SST (SPECIAL SERVICE TOOLS)
±
1UZ±FE ENGINE ENGINE MECHANICALEG±5
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Page 1382 of 4087

LEXUS SC400 1991 Service Repair Manual
EG±6±
1UZ±FE ENGINE ENGINE MECHANICAL
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Page 1383 of 4087

$LEXUS SC400 1991 Service Repair Manual EG0AZ±06 RECOMMENDED TOOLS EG0B0±06 EQUIPMENT \ \ Battery specific gravity gauge \ $

EG0AZ±06
RECOMMENDED TOOLS
EG0B0±06
EQUIPMENT
\
\
Battery specific gravity gauge
\

\

\
Caliper gauge

\
\
CO/HC meter
\

\

\
Compression gauge

\

\

\

Connecting rod aligner

\
\
Cylinder gauge
\

\

\
Dial indicator

\

\

\

Dye penetrant

\
\
Engine tune±up tester
\

\

\
Heater

\
\
Magnetic finger
\

\

\
Micrometer

\

\

\
Piston ring compressor

\
\
Piston ring expander
\

\

\
Plastigage

\

\

\

Precision straight edge

\
\
Soft brush
±
1UZ±FE ENGINE ENGINE MECHANICALEG±7
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Page 1384 of 4087

$LEXUS SC400 1991 Service Repair Manual \ \ Spring tester Valve spring \ \ \ Steel$

\
\

Spring tester Valve spring
\

\

\
Steel square

Valve spring
\

\

\

Thermometer

\
\
Torque wrench
\

\

\
Valve seat cutter

\

\

Vernier calipers

EG0B1±0A
COOLANT
Item Capacity Classification
Engine coolant (w/ Heater) 10.8 liters (11.4 US qts, 9.5 lmp. qts) Ethylene±glycol base
EG0B1±10
LUBRICANT
Item Capacity Classification
Engine oil API grade SG or SH, Energy±Conserving II
Dry fill 6.0 liters (6.3 US qts, 5.3 lmp. qts) or ILSAC multigrade and recommended
Drain and refill viscosity oil with SAE 5W±30
w/ Oil filter change 4.8 liters (5.1 US qts, 4.2 lmp. qts) being the preferred engine oil
w/o Oil filter change 4.5 liters (4.8 US qts, 4.0 lmp. qts)
EG0B1±0J
SSM (SERVICE SPECIAL MATERIALS)
08826±00080 Seal packing or equivalent Camshaft bearing cap
Cylinder head semi±circular plug
Cylinder head cover
Rear oil sear retainer
08826±00080 Seal packing or equivalent Oil pump

08826±00100 Seal Packing 1282B, Water inlet housing
THREE BOND 1282B or equivalent Water seal plate
Water pump

08833±00070 Adhesive 1311, Drive plate bolt
THREE BOND 1311 or equivalent

08833±00080 Adhesive 1344 No.1 idler pulley bolt
THREE BOND 1344.
LOCTITE 242 or equivalent

EG±8±
1UZ±FE ENGINE ENGINE MECHANICAL
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