Maintenance Manual for J2 Sedan
Mechanical Part of Engine
77
③
Side clearance of Piston Ring
Measure the side clearance between piston ring
and piston ring groove top land by the feeler
gauge.
Standard values:
For 1
st
piston ring, 0.03
～
0.07mm
For 2nd piston ring, 0.04
～
0.06mm
Limits:
For 1
st
piston ring, 0.1mm
For 2
nd
piston ring, 0.1mm
If the measurement exceeds the limit, replace the piston ring, and then remeasure the gap. Replace the
piston if the measurement is still out of the limit.
④
End Gap of Piston Ring
Ensure that the inner diameter of cylinder stays
within the specified range.
See "Cylindricality of Cylinder"
Lubricate the piston and the piston ring with new
engine oil, then insert the piston ring till the piston
reaches the middle part of cylinder, measure end
gap of piston ring by the feeler gauge.
Standard values:
For 1
st
piston ring, 0.15-0.30mm
For 2
nd
piston ring, 0.30-0.50mm
Limits:
For 1
st
piston ring, 0.8mm
For 2
nd
piston ring, 0.8mm
If the measurement exceeds the limit, replace the piston ring, and then measure again. Extend cylinder
bore through grinding and use the corresponding piston and piston ring if the measurement is still over
the limit.
⑤
Planeness of Cylinder Body
Remove any gasket material and eliminate the engine oil, sediment, carbon or other contaminants on
surface of cylinder body.
Fig.1.1.062
Fig.1.1.061
Piston Ring
Feeler Gauge
Good
Feeler
Gauge
Bad
Feeler
Gau e
Piston
Piston
Rin
Piston
Ring
Measured Point
Pressed and Fixed
