I I I; Assembling The Crankcase - Yamaha SL292C 1971 Service Manual

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REASSEMBhlNG
·Crankshaft Ass'y, Assembling the Crankcase
3-1-2
Use a feeler gauge to measure for the correct free play of
0.001 ,..., 0.030~' (0.25,..., 0.75 mm).
Fig. 3-3
3-1-3
0.001
(0.25
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-0.030''
--0.75 mm)
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The runout of the crankshaft greatly affects the output of
the engine
at
high speed. Therefore, the crankshaft must be
checked for runout after reassembled.
If the machine runs in races, the crankshaft must
be
checked every
300
miles of operation. The connecting rod
large end bearing should also be carefully checked for
smoothness.
To measure the runout of the crankshaft, support the
crankshaft at its both ends, and measure the points (as
illustrated below) with a dial gauge.
The runout should be
0.0008'' (0.02
mm) or less at
journales
A
and
B, 0.0016'' (0.04
mm) or less at
C,
and
0.002'' (0.05 mm)
or less.
0.0008'' (0.02 mm) or less
,.......C
~A
Support
Interstice 0.01'' (0.25 mm)
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Interstice 0.01 '' (0.25 mm)
..,.___-!
B / D
,
Support
40 . 40
Both ends: 0.02'' (0.5
mm)
3-1-4
For procedures for disassen1bly and assembly of the
crankshaft, refer to the Special Tool Manual .
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Both ends:
0.02'' (0.5
m111) or more
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Support both ends wl1en press-fitting is made
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Crank pin
Fig.
3-5
3-2 ASSEMBLING THE CRANKCASE
To instal l the crankshaft in the crankcase, the special tool
as shown in the illustration should be used.
Assembling
tool
..........i.
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Fig. 3-6
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