SELVA MARINE Moray 25 Manuel D'entretien page 190

CRANKCASE, CRANKSHAFT ASSY., AND
POWR
CYLINDER BODY
All manuals and user guides at all-guides.com
Piston-to-cylinder clearance
Piston pin inspection
Piston ring inspection
NOTE:
Push the piston ring into the cylinder with
the piston crown.
5-37
1. Calculate:
Piston-to-cylinder clearance
Out of specification → Replace the
piston and piston rings, the cylinder
or both.
Piston-to-
Cylinder
cylinder =
bore
clearance
Piston-to-cylinder clearance:
0.035 ~ 0.065 mm
(0.0014 ~ 0.0026 in)
1. Measure:
Piston pin diameter
Out of specification → Replace the
piston pin.
Piston pin diameter:
15.965 ~ 15.970 mm
(0.6285 ~ 0.6287 in)
1. Measure:
End gap a
Out of specification → Replace the
piston ring.
End gap (installed):
Top piston ring:
0.15 ~ 0.30 mm
(0.006 ~ 0.012 in)
2nd piston ring:
0.30 ~ 0.50 mm
(0.012 ~ 0.020 in)
Oil ring:
0.20 ~ 0.70 mm
(0.008 ~ 0.028 in)
E
Piston
–
diameter