Yamaha F90D - Checking the Connecting Rod Big End Side Clearance; Checking the Crankshaft; Checking the Crankpin Oil Clearance

POWR
Power unit
5-43
6D81G11
Checking the connecting rod big end
side clearance
1. Measure the connecting rod big end side
clearance
a
. Replace the connecting
rod or crankshaft or both if out of specifi-
cation.
Checking the crankshaft
1. Measure the crankshaft journal diameter
a
, crankpin diameter
b
, and crankpin
width
c
. Replace the crankshaft if out of
specification.
2. Measure the crankshaft runout. Replace
the crankshaft if above specification.
Checking the crankpin oil clearance
1. Clean the bearings and the connecting
rod.
2. Install the upper bearing into the con-
necting rod
1
and the lower bearing into
the connecting rod cap
2
.
Connecting rod big end side
clearance
a
:
0.14–0.28 mm (0.0055–0.0110 in)
Crankshaft journal diameter
a
:
47.985–48.000 mm
(1.8892–1.8898 in)
Crankpin diameter
b
:
43.982–44.000 mm
(1.7316–1.7323 in)
Crankpin width
c
:
21.00–21.07 mm
(0.8268–0.8295 in)
Crankshaft runout limit:
0.03 mm (0.0012 in)
S6D85590