Suzuki Wagon R Manual page 528

2) Next, check bearing cap bore diameter without bearing.
On mating surface of cylinder block, four alphabets are stamped
as shown in figure.
Three kinds of alphabets ("A", "B" and "C") represent following
cap bore diameters.
Alphabet stamped
The first, second, third, fourth and fifth (left to right) stamped al-
phabets represent cap bore diameters of bearing caps "1", "2",
"3", "4" and "5", respectively.
For example, in figure, the first (leftmost) alphabet "B" indicates
that cap bore dia. of bearing cap "1" is within 49.006 – 49.012 mm,
and the fifth (rightmost) alphabet "A" indicates that cap bore dia.
of cap "5" is within 49.000 – 49.006 mm.
3) There are five kinds of standard bearings differing in thickness.
To distinguish them, they are painted in following colors at the
position as indicated in figure.
Each color indicates following thickness at the center of bearing.
Color painted
Green
Black
Colorless
(no paint)
Yellow
Blue
1. Paint
Bearing cap bore diameter
49.000 – 49.006 mm
A
(1.9291 – 1.9294 in.)
49.006 – 49.012 mm
B
(1.9294 – 1.9296 in.)
49.012 – 49.018 mm
C
(1.9296 – 1.9298 in.)
Bearing thickness
1.996 – 2.000 mm
(0.0786 – 0.0787 in.)
1.999 – 2.003 mm
(0.0787 – 0.0788 in.)
2.002 – 2.006 mm
(0.0788 – 0.0789 in.)
2.005 – 2.009 mm
(0.0789 – 0.0790 in.)
2.008 – 2.012 mm
(0.0790 – 0.0791 in.)
ENGINE MECHANICAL 6A1-73
(without bearing)