Checking The Crankshaft; Checking The Crankshaft Pin Oil Clearance - Yamaha F15B Service Manual

Checking the crankshaft

1. Measure the crankshaft journal diameter
a, crank pin diameter b, and crank pin
width c. Replace the crankshaft if out of
specification.
c
b
Crankshaft journal diameter a:
34.997–35.009 mm
(1.3778–1.3783 in)
Crank pin diameter b:
30.997–31.009 mm
(1.2204–1.2208 in)
Crank pin width c:
21.000–21.070 mm
(0.8268–0.8295 in)
2. Measure the crankshaft run-out. Replace
the crankshaft if out of specification.
Crank stand aligner:
90890-03107
Crankshaft run-out limit:
0.05 mm (0.0020 in)
Checking the crankshaft pin oil
clearance
1. Clean the bearings and the connecting
rod.
6D45F11
2. Put a piece of Plastigauge
the crank pin, parallel to the crankshaft.
a
NOTE:
Be sure not to put the Plastigauge
over the oil hole in the crank pin of the crank-
6D451280
shaft.
3. Install the connecting rod to the crank pin
1.
NOTE:
9 Align the finished side a on the connecting
rod cap and connecting rod.
9 Face the embossed "Y" mark on the con-
necting rod toward the flywheel side of the
6D451290
crankshaft.
4. Tighten the connecting rod bolts to the
specified torques in two stages.
Cylinder block
® (PG-1) onto
6D451340
® (PG-1)
Y
a
1
6D451350
6D451360
5-42
1
2
3
4
5
6
7
8
9