Checking The Big End Oil Clearance - Yamaha F30B 2018 Service Manual

Checking the big end oil clearance

1. Measure:
• Big end oil clearance
Out of specification  Replace crankshaft
pin bearing.
See "Selecting the crankshaft pin bearing"
(7-57).
Big end oil clearance
0.016–0.040
0.0016 in)
Limit
0.070 mm (0.0028 in)
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a. Clean the crankshaft pin bearings, con-
necting rod, connecting rod cap, and
crankshaft.
b. Install the crankshaft pin bearings "1" into
the connecting rod "2" and connecting rod
cap "3".
TIP:
• Install the crankshaft pin bearings in their
original positions.
• Install the protrusions "a" of the crankshaft pin
bearing into the grooves "b" on the connect-
ing rod "2" and connecting rod cap "3".
1
3
b
c. Place a piece of Plastigauge (PG-1) on the
crankshaft pin, parallel to the crankshaft.
Do not place the Plastigauge (PG-1) over
the oil hole in the crankshaft pin of the
crankshaft.
mm (0.0006–
2
b
a
a
d. Install the connecting rod "1" and connect-
ing rod cap "2" onto the crankshaft pin.
TIP:
• When checking the oil clearance, reuse the
removed connecting rod bolts.
• Make sure that the protrusions "a" on the con-
necting rod "1" and connecting rod cap "2"
face toward the flywheel magneto end of the
crankshaft.
• Do not turn the connecting rod until the big
end oil clearance measurement has been
completed.
e. Tighten the connecting rod bolts "3" to the
specified torques in 2 stages.
3
Connecting rod bolt "3"
1st: 6 N·m (0.6 kgf·m, 4.4 lb·ft)
2nd: 17 N·m (1.7 kgf·m, 13 lb·ft)
7-56
Cylinder block
2
a
1