Cylinder Block - Inspection (Cont'd)

EM-149prose procedure

Two crankshaft types shown (Type I and Type II) for grade number punching locations.

Inspection (Cont'd)

4
Measure outer diameter "Dm" of each crankshaft main journal.
SEM944C
5
Calculate main bearing clearance. Main bearing clearance = A - Dm
Standard: 0.004 - 0.022 mm (0.0002 - 0.0009 in)
Limit: 0.050 mm (0.0020 in)
6
If it exceeds the limit, replace bearing.
7
If clearance cannot be adjusted within the standard of any bearing, grind crankshaft journal and use undersized bearing.
a
When grinding crankshaft journal, confirm that "L" dimension in fillet roll is more than the specified limit.
"L": 0.1 mm (0.004 in)
SEM964
b
Refer to S.D.S. for grinding crankshaft and available service parts.
8
If crankshaft is reused, measure main bearing clearances and select thickness of main bearings. If crankshaft is replaced with a new one, it is necessary to select thickness of main bearings as follows:
a
Grade number of each cylinder block main journal is punched on the respective cylinder block. These numbers are punched in either Arabic or Roman numerals.
SEM313D
b
Grade number of each crankshaft main journal is punched on the respective crankshaft. These numbers are punched in either Arabic or Roman numerals.
SEM013D