Checking The Journal Oil Clearance - Yamaha F30B 2018 Service Manual

Checking the journal oil clearance

1. Measure:
• Journal oil clearance
Out of specification  Replace crankshaft
journal bearing.
See "Selecting the crankshaft journal bear-
ing" (7-59).
Journal oil clearance
0.012–0.036
0.0014 in)
Limit
0.066 mm (0.0026 in)
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a. Clean the crankshaft journal bearings,
crankshaft journals, and bearing portions
of the crankcase and cylinder block.
b. Place the cylinder block with the crank-
case mating surface facing up.
c. Install the crankshaft journal bearings "1"
and crankshaft "2" into the cylinder block
"3".
TIP:
• Install the crankshaft journal bearings "1" in
their original positions.
• Do not turn the crankshaft "2" until the journal
oil clearance measurement has been com-
pleted.
2
d. Place a piece of Plastigauge (PG-1) on
each crankshaft journal, parallel to the
crankshaft.
Do not place the Plastigauge (PG-1) over
the oil hole in each crankshaft journal.
mm (0.0005–
1
3
7-58
e. Install the crankshaft journal bearings into
the crankcase.
TIP:
Install the crankshaft journal bearings in their
original positions.
f. Install the crankcase "1", and then tighten
the crankcase bolts (M8) "2" to the speci-
fied torques in 2 stages and in the order
[1], [2], and so on.
g. Tighten the crankcase bolts (M6) "3" to the
specified torques in 2 stages and in the or-
der [9], [10], and so on.
3
3
Cylinder block
3
2
2
3
2
2
2
3
1