Checking The Crankpin Oil Clearance - Yamaha F150B Service Manual

b
c
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)
2. Measure the crankshaft runout. Replace
the crankshaft if out of specification.
Crankshaft runout limit:
0.03 mm (0.0012 in)

Checking the crankpin oil clearance

1. Clean the bearings and the connecting
rod.
2. Install the upper
connecting rod a and the lower bearing
into the connecting rod cap b.
b
bearing into the
a
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.
c
TIP:
Make sure that the marks a of the connect-
ing rod faces towards the flywheel magnet
side of the crankshaft.
Crankcase
0
1
2
3
4
5
6
7
a
8
9
10
A
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