1991 LEXUS SC400 Service Repair Manual

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Page 1481 of 4087

LEXUS SC400 1991 Service Repair Manual H. Inspect camshaft gear backlash (a) Install the camshafts without installing the exhaust camsub±gear. (See step 7 on pages EG±114 to 120) (b) Using a dial indicator, measure the backlash. Stan

Page 1482 of 4087

LEXUS SC400 1991 Service Repair Manual 12. INSPECT AIR INTAKE CHAMBERUsing a precision straight edge and feeler gauge, measure the surface contacting the intake manifold for warpage. Maximum warpage: 0.15 mm (0.0059 in.) If warpage is gr

Page 1483 of 4087

LEXUS SC400 1991 Service Repair Manual 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.

Page 1484 of 4087

LEXUS SC400 1991 Service Repair Manual 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

Page 1485 of 4087

LEXUS SC400 1991 Service Repair Manual CYLINDER HEADS INSTALLATION EG22V±02 (See Components for Removal and Installation) 1. INSTALL RH EXHAUST MANIFOLD TO RH CYLINDERHEAD (a) Place a new gasket on the cylinder head with the white pain

Page 1486 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Install the exhaust manifold with 8 new nuts. Uniformlytighten the nuts in several passes. Torque: 44 N Vm (450 kgf Vcm, 33 ft Vlbf) (c) Install the main heated oxygen sensor. Torque: 44 N Vm

Page 1487 of 4087

LEXUS SC400 1991 Service Repair Manual 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 lig

Page 1488 of 4087

LEXUS SC400 1991 Service Repair Manual (e) Retighten the cylinder head bolts 90 in the numerical order shown. (f) Check that the painted mark is now at a 90  angle to front. 4. CONNECT MAIN HEATED OXYGEN SENSOR CONNECTORS Connect t
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