Piston Ring Inspection - Yamaha XVS650 Service Manual

CYLINDERS AND PISTONS
ENG
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PISTON RING INSPECTION
1.Measure:
• Side clearance (piston to piston rings)
Out of specification
---7
Replace the piston
and the piston rings as a set.
NOTE: _
Before measuring the side clearance
remove the carbon deposits from the piston
ring grooves and rings.
Side clearance (piston ring):
Top ring:
0.03 - 0.07 mm
(0.001 - 0.003 in)
<Limit>: 0.12 mm (0.005 in)
2nd ring:
0.02 - 0.06 mm
(0.0008 - 0.0024 in)
<Limit>: 0.12
mm
(0.0047 in)
307-027
2.Position:
• Piston ring
(into the cylinder)
NOTE: _
Using the piston crown push the ring into
the cylinder so that the ring will be at a right
angle to the cylinder bore.
®
40 mm (1.57 in)
3.Measure:
• End gap
Out of specification
---7
Replace.
NOTE: _
You cannot measure the end gap on the
expander spacer of the oil ring. If the oil
ring rails show excessive gap, replace all
three rings.
End
gap:
Top ring:
0.15 - 0.30 mm
(0.006 - 0.012 in)
<Limit>: 0.55
mm
(0.022 in)
2nd ring:
0.30 - 0.45
mm
(0.012 .... 0.018 in)
<Limit>: 0.80
mm
(0.003 in)
Oil
ring:
0.2 - 0.7 mm (0.008 - 0.028 in)
4 31