Checking The Crankcase Bolt; Checking The Crankpin Oil Clearance - Yamaha F200B Service Manual

POWR
b
Crankshaft journal diameter a:
62.968–62.992 mm (2.4791–2.4800
in)
Crankpin diameter b:
49.976–50.000 mm (1.9676–1.9685
in)
Crankpin width c:
21.500–21.550 mm (0.8465–0.8484
in)
2. Measure the crankshaft runout.
Crankshaft runout:
0.030 mm (0.0012 in)

Checking the crankcase bolt

1. Measure the diameters a and b of the
crankcase bolt at the specified measur-
ing points c and d, and c and e.
Replace the crankcase bolt if the differ-
ence between the diameters is above
specification.
7-89
Power unit
c
c
È
d
É
e
È M10 × 102 mm
É M8 × 93 mm
Crankcase bolt diameter difference limit:
È: a – b = Less than 0.20 mm (0.0079
in)
É: a – b = Less than 0.10 mm (0.0039
in)
Measuring point c: 10.0 mm (0.39 in)
Measuring point d: 65.0 mm (2.56 in)
Measuring point e: 60.0 mm (2.36 in)

Checking the crankpin oil clearance

1. Clean the crankpin bearings, connecting
rod, connecting rod cap, and crankpin.
2. Install the crankpin bearings 1 into the
connecting rod a and connecting rod
cap b.
1
b
TIP:
Install the crankpin bearings in the original
positions.
3. Place a piece of Plastigauge (PG-1) on
the crankpin, parallel to the crankshaft.
b a
c
a
b
c
a