Suzuki RA410, Manual

Page: 332 / 761

5) Remove lower crankcase and using scale on gaging plastic en-
velope, measure gaging plastic width at its widest point. If clear-
ance exceeds its limit, replace bearing. Always replace both
upper and lower inserts as a unit.
New bearings should produce proper clearance.
After selecting new bearings, recheck clearance.
1. Gaging plastic
2. Scale
Selection of main bearings
If bearing is in malcondition, or bearing clearance is out of specifi-
cation, select a new bearing according to following procedure and
install it.
1) First check journal diameter by using following procedure.
As shown in the figure, crank web (1) of No. 2 cylinder has five
stamped numerals.
Three kinds of numerals (“1”, “2” and “3”) represent following
journal diameters.
The first, second, third, fourth and fifth (left to right) stamped nu-
merals represent journal diameters respectively as shown in
the figure.
For example, in the figure, the first (uppermost) numeral “1” indi-
cates that corresponding (leftmost (crank shaft pulley side), in
this case) journal dia. is within 44.994 – 45.000 mm.
1
ENGINE MECHANICAL 6A4-73
Standard Limit
Bearing clearance
0.014 – 0.034 mm
(0.0006 – 0.0013 in.)
0.059 mm
(0.0023 in.)
Numeral stamped Journal diameter
1
44.994 – 45.000 mm
(1.7714 – 1.7717 in.)
2
44.988 – 44.994 mm
(1.7712 – 1.7714 in.)
3
44.982 – 44.988 mm
(1.7709 – 1.7712 in.)