1991 LEXUS SC400 Service Repair Manual

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Page 1465 of 4087

LEXUS SC400 1991 Service Repair Manual D. Remove intake camshaft from LH cylinder head (a) Remove the bearing cap second from the front. (b) Set the timing mark (1 dot mark) of the camshaft drive gearat approx. 60  angle by turning th

Page 1466 of 4087

LEXUS SC400 1991 Service Repair Manual (d) Using snap ring pliers, remove the snap ring. (e) Remove the following parts:(1) Wave washer (2) Camshaft sub±gear (3) Camshaft gear spring HINT: Arrange the camshaft sub±gears and gear spri

Page 1467 of 4087

LEXUS SC400 1991 Service Repair Manual 40. DISCONNECT MAIN HEATED OXYGEN SENSORCONNECTORS Disconnect the RH and LH oxygen sensor connectors. 41. REMOVE CYLINDER HEADS (a) Uniformly loosen the ten cylinder head bolts one side of each c

Page 1468 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Lift the cylinder head from the dowels on the cylinder block,and place the 2 cylinder heads on wooden blocks on a bench. HINT: If the cylinder head is off, pry between the cylinder head and cyli

Page 1469 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Remove the main heated oxygen sensor. (c) Remove the 8 nuts, exhaust manifold and gasket. EG11C±06 CYLINDER HEAD DISASSEMBLY (See Components for Removal and Installation) 1. REMOVE VALVE LIFT

Page 1470 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Remove the following parts:(1) Spring retainer (2) Valve spring (3) Valve (4) Spring seat HINT: Arrange the valves, valve springs, spring seats and spring retainers incorrect order. (c) Using n

Page 1471 of 4087

LEXUS SC400 1991 Service Repair Manual EG1KM±02 CYLINDER HEAD COMPONENTS INSPECTION AND REPAIR 1. CLEAN TOP SURFACES OF PISTONS AND CYLINDERBLOCK (a) Turn the crankshaft, and bring each piston to top dead center (TDC). Using a gasket s

Page 1472 of 4087

LEXUS SC400 1991 Service Repair Manual D. Clean cylinder headUsing a soft brush and solvent, thoroughly clean the cylinder head. 3. INSPECT CYLINDER HEAD A. Inspect for flatness Using a precision straight edge and feeler gauge, measure
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