Yamaha F100A - Connecting Rod Big-End Oil Clearance

5-42
POWR
E
CRANKSHAFT AND PISTON/
CONNECTING ROD ASSY.
● If the difference between the cylinder
block journal diameter and crankshaft
journal diameter is more than the
maximum value (6.058 mm), replace
the crankshaft, cylinder block, or both.
CAUTION:
The (*) mark indicates that the color of
the upper and lower bearings are differ-
ent. Install the main-bearings in the mid-
dle of the cylinder block and crankcase
journal so they do not block the oil holes.
NOTE:
Crankshaft bearing #3 is a thrust bearing.
Connecting rod big-end oil clearance
CAUTION:
● Mark the original connecting rod bolts so
they are not confused with the new bolts.
● Do not reuse the original connecting rod
bolts during assembly, only use them
when measuring and adjusting the oil
clearance.
● Before assembly, remove any small metal
particles from the big- end mating surface
and also thoroughly clean it.
1. Measure:
● Big-end oil clearance
Out of specification → Replace the
upper and lower bearings as a set.
NOTE:
Measure the big-end oil clearance at room
temperature (20 ˚C (68 ˚F)).
Big-end oil clearance:
0.023 ~ 0.035 mm
(0.0009 ~ 0.0014 in)