Yamaha F50F - Checking the Crankshaft; Checking the Crankpin Oil Clearance

6C13G11
5-42
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Checking the crankshaft
1. Measure the crankshaft journal diameter
a
, crankpin diameter
b
, and crankpin
width
c
. Replace the crankshaft if out of
specification.
2. Measure the crankshaft runout. Replace
the crankshaft if above specification.
Checking the crankpin oil clearance
1. Clean the bearings and the connecting
rod.
2. Install the upper bearing into the con-
necting rod
1
and the lower bearing into
the connecting rod cap
2
.
NOTE:
• Install the connecting rod bearings in their
original positions.
• Insert the projection
a
of each bearing into
the slots in the connecting rod cap and con-
necting rod.
Connecting rod big end side
clearance
a
:
0.05–0.22 mm (0.0020–0.0087 in)
Crankshaft journal diameter
a
:
42.984–43.000 mm
(1.6923–1.6929 in)
Crankpin diameter
b
:
32.984–33.000 mm
(1.2986–1.2992 in)
Crankpin width
c
:
21.000–21.070 mm
(0.8268–0.8295 in)
S6D55800
a
a
Crankshaft runout limit:
0.03 mm (0.0012 in)
Cylinder block