1991 LEXUS SC300 Service Repair Manual

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Page 1745 of 4087

LEXUS SC300 1991 Service Repair Manual (d) Hand±lap the valve and valve seat with an abrasivecompound. (e) After hand±lapping, clean the valve and valve seat. 9. INSPECT VALVE SPRINGS (a) Using a steel square, measure the squareness

Page 1746 of 4087

LEXUS SC300 1991 Service Repair Manual 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 c

Page 1747 of 4087

LEXUS SC300 1991 Service Repair Manual (e) Remove the bearing caps. (f) Measure the Plastigage at its widest point. Standard oil clearance: 0.035±0.072 mm(0.0014±0.0028 in.) Maximum oil clearance: 0.10 mm (0.039 in.) If the oil clea

Page 1748 of 4087

LEXUS SC300 1991 Service Repair Manual (c) Subtract the lifter diameter measurement from the lifterbore diameter measurement. Standard oil clearance: 0.024±0.050 mm (0.0009±0.0020 in.) Maximum oil clearance: 0.07 mm (0.0028 in.) If

Page 1749 of 4087

LEXUS SC300 1991 Service Repair Manual ASSEMBLY OF CYLINDER HEAD (See Components on page EM±35)HINT: wThoroughly clean all parts to be assembled. w Before installing the parts, apply new engine oil to all sliding and rotating surfaces. w

Page 1750 of 4087

LEXUS SC300 1991 Service Repair Manual 3. INSTALL VALVES(a) Install new oil seal on the valve guide bushing. HINT: The intake valve oil seal is brown and the exhaust valve oil seal is black. (b) Install the following parts:(1) Valve (2)

Page 1751 of 4087

LEXUS SC300 1991 Service Repair Manual (d) Using a plastic±faced hammer, lightly tap the valve stem tip to assure proper fit. 4. INSTALL VALVE LIFTERS AND SHIMS (a) Install the valve lifter and shim. (b) Check that the valve lifter r

Page 1752 of 4087

LEXUS SC300 1991 Service Repair Manual (d) Mark the front of the cylinder head bolt head with paint. (e) Second retighten the cylinder head bolts 90 in the numerical order shown above. (f) Third retighten cylinder head bolts by an ad
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