1991 LEXUS SC400 Service Repair Manual

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Page 1737 of 4087

LEXUS SC400 1991 Service Repair Manual (c) Uniformly loosen and remove the 12 bearing cap boltsin several passes in the sequence shown, and remove the six bearing caps and camshaft. Remove the intake and exhaust camshafts. 21. REMOVE CYL

Page 1738 of 4087

LEXUS SC400 1991 Service Repair Manual DISASSEMBLY OF CYLINDER HEAD (See Components on page EM±35)1. REMOVE VALVE LIFTERS AND SHIMS HINT: Store the valve lifters and shims in correct order. 2. REMOVE VALVES (a) Using SST, compress the v

Page 1739 of 4087

LEXUS SC400 1991 Service Repair Manual 3. REMOVE ENGINE HANGERS 4. REMOVE ENGINE COOLANT TEMPERATURE SENSORAND SENDER GAUGE 5. REMOVE THROTTLE CABLE BRACKET AND GROUND STRAP 6. REMOVE EGR COOLER INSPECTION, CLEANING AND REPAIR OF CYLINDER

Page 1740 of 4087

LEXUS SC400 1991 Service Repair Manual B. Clean combustion chambersUsing a wire brush, remove all the carbon from the combus- tion chambers. NOTICE: Be careful not to scratch the cylinder block con- tact surface. C. Clean valve guide bush

Page 1741 of 4087

LEXUS SC400 1991 Service Repair Manual B. Inspect for cranksUsing a dye penetrant, check the combustion chamber, in- take ports, exhaust ports and cylinder block surface for cracks. If cracked, replace the cylinder head. 4. CLEAN VALVES (

Page 1742 of 4087

LEXUS SC400 1991 Service Repair Manual 6. IF NECESSARY, REPLACE VALVE GUIDE BUSHINGS(a) Using SST and a hammer, tap out the guide bushing. SST 09201±70010 (b) Using a caliper gauge, measure the bushing borediameter of the cylinder head.

Page 1743 of 4087

LEXUS SC400 1991 Service Repair Manual (e) Using a sharp 6 mm reamer, ream the guide bushing toobtain the standard specified clearance (See page EM±45) between the guide bushing and valve stem. 7. INSPECT AND GRIND VALVES (a) Grind th

Page 1744 of 4087

LEXUS SC400 1991 Service Repair Manual 8. INSPECT AND CLEAN VALVE SEATS(a) Using a 45  carbide cutter, resurface the valve seats. Remove only enough metal to clean the seats. (b) Check the valve seating position. Apply a thin coat of
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