Toyota Supra 1990 Manual page 104

EM-72
No.1, No.2 Journal
No.3, No.4 Journal
Mark
0, 1 or 2
ENGINE MECHANICAL - Cylinder Block
EM2974
EM3928
No.5, No.6 Journal
EM6890
EM6954
(f) Install the upper main bearing on the cylinder block
and crankshaft.
(g) Lay a strip of Plastigage across the main journals.
(h) Install the main bearing caps. Torque the cap bolts.
Torque: 1,040 kg-cm (75 ft-Ib, 102 Nom)
HINT: Do not turn crankshaft.
(i)
Remove the main bearing caps.
(j) Measure the Plastigage at its widest point.
Standard clearance: 0.030 - 0.048 mm
(0.0012 - 0.0019 in.)
Maximum clearance: 0.07 mm (0.0028 in.)
If the oil clearance is greater than maximum, replace the
bearings. If necessary, replace the crankshaft.
Undersized bearing: U/S 0.25
HINT: If using a standard size bearing, replace with one
having the same number. If the number of the bearing can-
not be determined, select a bearing from the table below
according to the numbers imprinted on the cylinder block
and crankshaft. There are five sizes of standard bearings,
marked "1", "2", "3", "4" and "5" accordingly.
----------
Number marked
Cylinder Block 1 1 2
1
2 3 2 3 3
Crankshaft
0 1 0
2
1 0
2
1
2
Bearing
1
2 2 3 3 3
4 4 5
Example: Cylinder Block" 2", Crankshaft" 1"
=
Bearing" 3"