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6A1-78 ENGINE MECHANICAL (M13 ENGINE)
Selection of main bearings
STANDARD BEARING :
If bearing is in malcondition, or bearing clearance is out of specifi-
cation, select a new standard bearing according to the following
procedure and install it.
1) First check journal diameter. As shown in figure, crank web
No.2 has stamped numbers.
Three kinds of numbers ("1", "2" and "3") represent the fol-
lowing journal diameters.
Stamped numbers on crank web No.2 represent journal
diameters marked with an arrow in figure respectively.
For example, stamped number "1" indicates that correspond-
ing journal diameter is 44.994 – 45.000 mm (1.7714 –
1.7717 in.).
Crankshaft journal diameter
Stamped
numbers
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.)
2) Next, check bearing cap bore diameter without bearing. On
mating surface of cylinder block, five alphabets are stamped
as shown in figure.
Three kinds of alphabets ("A", "B" and "C") represent the fol-
lowing cap bore diameters.
Stamped alphabets on cylinder block represent bearing cap
bore diameter marked with an arrow in figure respectively.
For example, stamped "A" indicates that corresponding bear-
ing cap bore diameter is 49.000 – 49.006 mm (1.9291 –
1.9294 in.).
Crankshaft bearing cap bore
Stamped
alphabet
A
49.000 - 49.006 mm (1.9291 - 1.9294 in.)
B
49.006 - 49.012 mm (1.9294 - 1.9296 in.)
C
49.012 - 49.018 mm (1.9296 - 1.9298 in.)
Journal diameter
Bearing cap bore diameter
(without bearing)
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