CRANKSHAFT, PISTON AND CYLINDER BODY
CHECKING THE CRANKSHAFT-
CONNECTING ROD OIL CLEARANCE
NOTE:
Make sure that the crankshaft is qualified
before initiating the following procedure.
Measure:
Crankshaft-connecting rod oil
clearance
Out of specification
Replace the
connecting rod and cap as a set.
NOTE:
Keep each connecting rods and caps as a
set.
Measure the oil clearance at room
temperature (20°C (68°F))
Measuring steps:
CAUTION:
Install the connecting rods and caps in
their original positions. Incorrect oil
clearance measurements can lead to
engine damage.
NOTE:
Make sure that the “YAMAHA” mark
a
on the connecting rod faces toward the
flywheel side.
Align the “∆“ marks
b
on the connecting
rod and cap when assembling.
(1)Clean the bearing portion of the
connecting rod and crank pin journal
of the crankshaft.
(2)Install the connecting rod onto the
crankshaft.
(3)Put a piece of Plastigauge® on crank
pin journal in parallel to the crankshaft.
NOTE:
Do not put a Plastigauge® over the oil hole
in the crank pin journal of the crankshaft.
Crankshaft-connecting rod oil
clearance:
0.030 - 0.042 mm
(0.0012 - 0.0017 in)
5-59
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