Yanmar ViO12-2A, Руководство по обслуживанию

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4. ENGINE
4-3-11
4) Measuring the Ring Groove Width, the Ring Width (B), and the End Gap
To measure the piston ring groove width, first measure the
width (B) of the piston ring. Then, fit the piston ring into
the ring groove after cleaning the groove carefully. Insert a
thickness gauge between the piston ring and the groove
to measure the clearance between them. Obtain the ring
groove width by adding the ring width to the measured
clearance.
To measure the end gap, push the piston ring into the
sleeve using the piston head, insert a thickness gauge
between both ends of the piston ring. If the sleeve is worn,
measure the end gap after pushing the piston ring into the
sleeve to the portion which is less worn 30 mm from the
lower end of the sleeve).
Standard Wear limit
Top
ring
Ring groove
width
Refer to Section "3-2 1) Nominal
and Allowable Values".
Ring width (B)
Clearance
between
groove and ring
End gap
Second
ring
Ring groove
width
Ring width (B)
Clearance
between
groove and ring
End gap
Oil ring
Ring groove
width
Ring width (B)
Clearance
between
groove and ring
End gap
(Measuring the ring groove width)
(B)
Width
Thickness
End gap
Measuring the end gap
of piston ring ( )
Approx. 30 mm
Piston ring
Cylinder block