Mazda MX-5 1990 Workshop Manual page 91

B
05UOBX-190
WIDTH
05UOBX-191
6-64
1_
ASSEMBLY
(7) Remove the main bearing caps, and measure the Plasti-
gage at each journal at the widest point for the smallest
clearance, and at the narrowest point for the largest
clearance.
(8) If the oil clearance exceeds specification, grind the
crankshaft and use undersize main bearings.
(Refer to page 8-58.)
Oil clearance: 0.018-0.036mm (0.0007-0.0014 in)
Maximum: 0.10mm (0.004 in)
2. Apply a liberal amount of clean engine oil to the main bear-
ings, thrust bearings and main journals.
3. Install the crankshaft and the main bearing caps accord-
ing to the cap number and
y::o
mark.
4. Tighten the main bearing cap bolts in two or three steps
in the order shown in the figure.
Tightening torque:
54-59 N·m (5.5-6.0 m-kg, 40-43 ft-Ib)
5. Measure the crankshaft end play.
End play: 0.080-0.282mm (0.0031-0.0111 in)
Maximum: 0.30mm (0.012 in)
6. If the end play exceeds the maximum, grind the crankshaft
and install an oversize thrust bearing or replace the crank-
shaft and thrust bearing.
Thrust bearing width
Standard:
2.500-2.550mm (0.0984-0.1004 in)
0.25mm (0.010 in) oversize:
2.625-2.675mm (0.1033-0.1053 in)
0.50mm (0.020 in) oversize:
2.750-2.800mm (0.1083-0.1102 in)
0.75mm (0.030 in) oversize:
2.875-2.925mm (0.1132-0.1152 in)
-.