Yamaha F6AMH, Service Manual

Page: 290 / 510

CRANKSHAFT, PISTON AND CYLINDER BODY
NOTE:
When measuring the piston diameter,
position the micrometer in relation to the
piston pin hole as shown.
2. Measure:
Piston pin boss inside diameter
(with a micrometer)
Out of specification
Replace the
piston.
CALCULATING THE PISTON-TO-
CYLINDER CLEARANCE
Calculate:
Piston-to-cylinder clearance
a
Out of specification Replace the
piston and piston rings, the cylinder
or both.
CHECKING THE PISTON PIN
Measure:
Piston pin outside diameter
Out of specification
Replace the
piston pin.
Piston pin boss inside diameter:
14.004 - 14.015 mm
(0.5513 - 0.5518 in)
Piston-to-cylinder clearance
a
:
0.035 - 0.065 mm
(0.0014 - 0.0026 in)
Piston-to-
cylinder
clearance
=
Cylinder
bore
diameter
–
Piston
diameter
Piston pin outside diameter:
13.996 - 14.000 mm
(0.5510 - 0.5512 in)
5-55