Yamaha F100A Service Manual page 224

POWR
9
I
5
E
A
K 1
D
4
H
8
CRANKSHAFT AND PISTON/
CONNECTING ROD ASSY.
3
2
1
0
J
6
F
B
2
L
C
3 3
G
7
Measuring steps:
CAUTION:
Install the bearings in their original posi-
tions. Incorrect oil clearance measure-
ments can lead to engine damage.
Clean the bearings, main journals, and
bearing portions of the crankcase and
cylinder block.
Place the cylinder block upside down
on a bench.
Install half of the bearings 1 and the
crankshaft 2 into the cylinder block 3.
Put a piece of Plastigauge
main journal in parallel to the crank-
shaft.
NOTE:
Do not put the Plastigauge
hole in the main journal of the crankshaft.
Install the other half of the bearings
into the crankcase.
Install the crankcase onto the cylinder
block.
Apply engine oil on to the threads and
seat of the crankcase bolts.
Tighten the bolts to the specified
torque in two steps in the order shown
in the illustration.
NOTE:
Do not move the crankshaft until the
main-bearing oil clearance measurement
has been completed.
Bolt (M8):
1st: 14 Nm (1.4 m • kg, 10 ft • lb)
2nd: 28 Nm (2.8 m • kg, 20 ft • lb)
Bolt (M10):
1st: 19 Nm (1.9 m • kg, 14 ft • lb)
2nd: 60˚
Remove the crankcase.
Measure the width of the compressed
Plastigauge
* Torque valve (for reference only)
5-40
®
on each
®
over the oil
50 Nm (5.0 m • kg, 36 ft • lb)*
®
on each main journal.
E