1991 LEXUS SC400 Service Repair Manual

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Page 2281 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Gradually heat the cylinder head to 80±1005C (176±2125F). (c) Using SST and a hammer, tap out the guide bushing. SST 09201±70010 (d) Using a caliper g auge, measure the bushing bore diamete

Page 2282 of 4087

LEXUS SC400 1991 Service Repair Manual (g) Using SST and a hammer, tap in a new guide bushinguntil the snap ring makes contact with the cylinder head. SST 09201±70010 HINT: Different the bushings are used for the intake and ex- haust.

Page 2283 of 4087

LEXUS SC400 1991 Service Repair Manual (d) Check the valve overall length. Standard overall length:Intake 94.95 mm (3.7382 in.) Exhaust 96.90 mm (3.8150 in.) Minimum overall length: Intake 94.45 mm (3.7185 in.) Exhaust 96.40 mm (3.7953 i

Page 2284 of 4087

LEXUS SC400 1991 Service Repair Manual (2) If the seating is too low on the valve face, use 755 and 45 5 cutters to correct the seat. (d) Hand±lap the valve and valve seat with an abrasive compound. (e) After hand±lapping, clean the

Page 2285 of 4087

LEXUS SC400 1991 Service Repair Manual 10. INSPECT CAMSHAFTS AND BEARINGS A. Inspect camshaft for runout(a) Place the camshaft on V±blocks. (b) Using a dial indicator, measure the circle runout at thecenter journal. Maximum circle run

Page 2286 of 4087

LEXUS SC400 1991 Service Repair Manual E. Inspect camshaft gear springUsing a vernier caliper, measure the free distance between the spring ends. Free distance: 18.2±18.8 mm (0.712±0.740 in.) If the free distance is not as specified, re

Page 2287 of 4087

LEXUS SC400 1991 Service Repair Manual G. Inspect camshaft thrust clearance(a) Install the camshafts.(See step 7 on pages EM±95 to 101) (b) Using a dial indicator, measure the thrust clearance while moving the camshaft back and forth.

Page 2288 of 4087

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