Yamaha EK25BMH Service Manual - Powr
Manual is about: Outboard Motor Yamaha EK25BMH
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230
CRANKSHAFT AND CYLINDER BODY
POWR
5-34
E
NOTE:
Push the piston ring into the cylinder with
the piston crown.
3. Measure:
•
Piston ring side clearance
(use a thickness gauge)
Out of specification
→
Replace.
NOTE:
When measuring the piston ring side clear-
ance, the outside of the piston ring should
be flush with the piston wall.
CHECKING THE CRANKSHAFT
1. Measure:
•
Crank width
(use the digital caliper)
Out of specification
→
Repair/replace.
Piston ring side clearance
Top: 0.03 - 0.05 mm
(0.0012 - 0.0020 in)
2nd: 0.03 - 0.07 mm
(0.0012 - 0.0028 in)
Crank width
56.90 - 56.95 mm
(2.2401 - 2.2421 in)
Crank width
153.7 - 154.0 mm
(6.0512 - 6.0630 in)
Crank width
39.9 - 40.1 mm
(1.5709 - 1.5787 in)
b
a
b
c