Crankpin-to-bearing clearance:
Check this clearance by using gaging plastic (1). Here’s how to
use gaging plastic:
1) Prepare, by cutting, a length of gaging plastic roughly equal
to bearing width and place it axially on crankpin, avoiding the
oil hole.
2) Make up the big end in the normal manner, with bearing
shells in place and by tightening the cap to the specification.
NOTE:
Never rotate crankshaft or turn connecting rod when a
piece of gaging plastic is in the radial clearance.
Tightening Torque
(a): 30 N·m (3.0 kg-m, 22.0 Ib-ft)
NOTE:
When fitting bearing cap to crankpin, be sure to discrimi-
nate between its two ends, right and left.
3) Remove the cap, and measure the width of flattened gaging
plastic (1) piece with the gaging plastic envelope scale (2).
This measurement must be taken at the widest part.
4) If the limit, indicated above, is exceeded, re-grind the crank-
pin to the undersize and use the undersize bearing, both of
which are stated below:
Where undersize bearings are used, the clearance specifica-
tion is slightly lenient:
ENGINE MECHANICAL (F8B ENGINE)
6A-29
Item
Standard
Limit
Crankpin-to-bearing
clearance
0.020 – 0.040 mm
(0.0008 – 0.0016 in.)
0.080 mm
(0.0031 in.)
Bearing size
Crankpin diameter
Standard
37.982 – 38.000 mm
(1.4953 – 1.4960 in.)
0.25 mm
undersize
37.732 – 37.750 mm
(1.4855 – 1.4862 in.)
0.50 mm
undersize
37.482 – 37.500 mm
(1.4757 – 1.4764 in.)
Radial clearance for
undersize bearing
0.020 – 0.070 mm
(0.0008 – 0.0028 in.)
