Toyota Supra 1990 Manual page 115

ENGINE MECHANICAL - Cylinder Block EM-83
EB
o
EM6792
EM6B54 EM37BO
INSPECTION AND REPAIR OF CRANKSHAFT
1. INSPECT CRANKSHAFT FOR RUNOUT
(a) Place the crankshaft on V-blocks.
(b) Using a dial indicator, measure the circle runout at the
center journal.
Maximum circle runout:
0.06
mm
(0.0024
in.)
If the circle runout is greater than maximum, replace the
crankshaft.
2.
INSPECT MAIN JOURNALS AND CRANK PINS
(a) Using a micrometer, measure the diameter of each
main journal and crank pin.
Journal diameter:
STD size
59.994 - 60.012
mm
(2.3620 - 2.3627
in.)
U/S
0.25 59.730 - 59.740
mm
(2.3516 - 2.3520
in.)
Crank pin diameter:
STD size
51.976 - 52.000
mm
(2.0463 - 2.0472
in.)
U/S
0.25 51.725 - 51.735
mm
(2.0364 - 2.0368
in.)
If the diameter is not within specification, check the oil
clearance. If necessary, grind or replace the crankshaft.
(b) Check each main journal and crank pin for taper and
out-of-round as shown.
Maximum taper and out-of-round:
0.02
mm
(0.0008
in.)
If taper or out-of-round is greater than maximum, grind or
replace the crankshaft.
3. IF NECESSARY, GRIND AND HONE MAIN JOURNALS
AND/OR CRANK PINS
Grind and hone the main journals and/or crank pins to the
finished undersized diameter (See procedure step 2).
Install new main journal and/or crank pin undersized
bearings.