Yamaha F75F - Checking the Big End Oil Clearance

Crankcase
7-53
Checking the big end oil clearance
1. Measure:
• Big
end oil clearance
Out of specification  Rep
lace crankshaft
pin bearing.
See “Selecting the crankshaft pin bearing”
(7-54).
a. Clean the crankshaft pin bearings,
connecting rod, connecting
rod cap,
and crankshaft.
b. Install the crankshaft pin bearings “1”
into the
connecting rod “2” and con-
necting rod cap “3”.
Install the crankshaft pin bearings in their orig-
inal positions.
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.
d. Install the connecting rod “1” and con-
necting rod cap “2” onto the crankshaft
pin.
• When checking the oil clearance, reuse the
removed connecting rod bolts.
• Make sure that the protrusions “a” on the
connecting 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 “1” to
the specified torques in 2 stages.
Big end oil clearance
0.017–0.040 mm (0.0007–0.0016
in)
Limit
0.070 mm (0.0028 in)
3
1
2
a
1
2