Yamaha F150B, Service Manual

Page: 269 / 458

7-56
Crankcase
0
1
2
3
4
5
6
7
8
9
10
A
2. Measure the crankshaft runout. Replace
the crankshaft if out of specification.
Checking the crankpin oil clearance
1. Clean the bearings and the connecting
rod.
2. Install the upper bearing into the
connecting rod
a
and the lower bearing
into the connecting rod cap
b
.
TIP:
Install the connecting rod bearings in their
original positions.
3. Put a piece of Plastigauge (PG-1) onto
the crankpin, parallel to the crankshaft.
TIP:
Make sure not to put the Plastigauge (PG-1)
over the oil hole in the crankpin of the crank-
shaft.
4. Install the connecting rod to the crankpin
c
.
TIP:
Make sure that the marks
a
of the connect-
ing rod faces towards the flywheel magnet
side of the crankshaft.
Crankshaft journal diameter
a
:
51.980–52.000 mm (2.0465–2.0472 in)
Crankpin diameter
b
:
49.980–50.000 mm (1.9677–1.9685 in)
Crankpin width
c
:
22.00–22.10 mm (0.8661–0.8701 in)
Crankshaft runout limit:
0.03 mm (0.0012 in)
b
c
b
a
a
c