1991 LEXUS SC400 Service Repair Manual

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Page 1609 of 4087

LEXUS SC400 1991 Service Repair Manual 6. INSPECT MAIN BEARING CAP STUD BOLTSUsing a vernier caliper, measure the tension portion diameter of the stud bolt. Standard diameter: 7.500±7.600 mm (0.2953±0.2992 in.) Minimum diameter: 7.40 m

Page 1610 of 4087

LEXUS SC400 1991 Service Repair Manual 2. REMOVE PISTON RINGS(a) U s i n g a p i s t o n r i n g e x pander, remove the two compression rings. (b) Remove the two side rails and oil ring expander by hand. HINT: Arrange the piston rings i

Page 1611 of 4087

LEXUS SC400 1991 Service Repair Manual HINT: wThe piston and pin are a matched set. w Arrange the pistons, pins, rings, connecting rods and bearings in correct order. INSPECTION OF PISTON AND CONNECTING ROD ASSEMBLIES 1. CLEAN PISTON (a)

Page 1612 of 4087

LEXUS SC400 1991 Service Repair Manual 2. INSPECT PISTON A. Inspect piston oil clearanceHINT: There are three sizes of the standard piston, marked º1º, º2º and º3º accordingly. The mark is stamped on the top of the piston. (a) Usin

Page 1613 of 4087

LEXUS SC400 1991 Service Repair Manual B. Inspect piston ring groove clearanceUsing a feeler gauge, measure the clearance between new piston ring and the wall of the piston ring groove. Ring groove clearance: No.1 0.020±0.060 mm (0.0008

Page 1614 of 4087

LEXUS SC400 1991 Service Repair Manual 3. INSPECT CONNECTING ROD A. Inspect connecting rod alignmentUsing a feeler gauge and rod aligner, check the connecting rod alignment. wCheck for bending. Maximum bending: 0.05 mm (0.0020 in.) per 1

Page 1615 of 4087

LEXUS SC400 1991 Service Repair Manual (b) Align the oil holes of the connecting rod and a newbushing. (c) Using SST and a press, press in the bushing. SST 09222±30010 (d) Using a pin hole grinder, hole the bushing to obtain the stand

Page 1616 of 4087

LEXUS SC400 1991 Service Repair Manual INSPECTION OF CRANKSHAFT 1. INSPECT CRANKSHAFT FOR RUNOUT(a) Place the crankshaft on V±blocks. (b) Using a dial indicator, measure the circle runout at thecenter journal. Maximum circle runout: 0
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