YAMAHA Marine 100A Manuel D'entretien page 300

POWR
CYLINDER BODY ASSEMBLY
5440
5450
INSPECTING THE PISTONS
Measure:
• Piston diameter
(with a micrometer)
Out of specification → Replace.
Measuring
point "H"
10 mm
Standard
(0.4 in)
Oversize piston diameter
1st oversize*
90.25 mm (3.553 in)
2nd oversize
90.50 mm (3.563 in)
*: Except for USA
NOTE:
When measuring the piston diameter, posi-
tion the micrometer in relation to the piston
pin hole as shown.
CALCULATING THE PISTON-TO-
CYLINDER CLEARANCE
Calculate:
• Piston-to-cylinder clearance a
Out of specification → Replace the pis-
ton and piston rings, the cylinder or
both.
Piston-to-
cylinder =
clearance
Piston-to-cylinder clearance
0.080 - 0.085 mm
(0.0031 - 0.0033 in)
5-53
Piston diameter
89.920 - 89.935 mm
(3.5402 - 3.5407 in)
Cylinder
Piston
bore –
diameter
diameter
E
5
5