6A1-72 ENGINE MECHANICAL (G13B, 1-CAM 16-VALVES ENGINE)
5) Remove cap and using scale (2) on gaging plastic (1) envelope,
measure gaging plastic width at its widest point. If clearance ex-
ceeds its limit, replace bearing. Always replace both upper and
lower inserts as a unit.
A new standard bearing may produce proper clearance. If not,
it will be necessary to regrind crankshaft journal for use of 0.25
mm undersize bearing.
After selecting new bearing, recheck clearance.
Standard Limit
Bearing clearance
0.020 – 0.040 mm
(0.0008 – 0.0016 in.)
0.060 mm
(0.0023 in.)
Selection of main bearings
STANDARD BEARING:
If bearing is in malcondition, or bearing clearance is out of specifica-
tion, select a new standard bearing according to the following pro-
cedure and install it.
1) First check journal diameter by using the following procedure.
As shown in figure, crank webs (1) of No.2 and No.3 cylinders
have five stamped numerals.
Three kinds of numerals (“1”, “2” and “3”) represent the following
journal diameters.
Numeral stamped
Journal diameter
1
44.994 – 45.000 mm
(1.7714 – 1.7716 in.)
2
44.988 – 44.994 mm
(1.7712 – 1.7714 in.)
3
44.982 – 44.988 mm
(1.7709 – 1.7712 in.)
The first, second, third, fourth and fifth (left to right) stamped nu-
merals represent journal diameters at bearing caps “1”, “2”, “3”,
“4” and “5” respectively.
For example, in figure, the first (leftmost) numeral “3” indicates
that journal dia. at bearing cap “1” is within 44.982 – 44.988 mm,
and second one “1” indicate that journal dia. at cap “2” is within
44.994 – 45.000 mm.
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