Bushing selection
CRANKSHAFT BUSHINGS
CRANKCASE CATEGORY
Three crankcase classes are available (A - B- C)
which differentiate in the diameter of the hole in the
bearings.
The category is marked on the crankcase, on the
right side, in the area below the crankshaft.
Different classes of bearings can be used (e.g.: A
- B - C or B - B - C or A - B - A ....).
A number that indicates the position of the main
journal is stamped on the crankcase:
1. flywheel side;
2. central;
3. clutch side
C
RANKCASE CATEGORY
Specification
Desc./Quantity
Class A Bushing seat diameter 52.023 - 52.018 mm (2.0481 - 2.0479
in)
Class B Bushing seat diameter 52.018 - 52.013 mm (2.0479 - 2.0477
in)
Class C Bushing seat diameter 52.013 - 52.008 mm (2.0477 - 2.0475
in)
SHAFT CATEGORY
The three crankshaft main journals
1. flywheel side;
2. central;
3. clutch side
they are each selectable in two pairs of classes, A-
B (up to engine No. 3990) or C-D-E (from Engine
No. 3991).
The class is stamped on the flat face of the coun-
terweight, as shown in the image.
The three main journals may have different
classes to each other according to the type of cou-
RSV4 Factory a-PRC Engine
ENG - 365
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