Johnson J10RLSRD Service Manual page 198

Place each ring, in turn, in its respective bore. Use
a piston to square the ring in the cylinder. Use a
feeler gauge to measure the ring end gap. The
ring gap must be within 0.007 to 0.017 in. (0.17 to
0.43 mm).
Use a feeler gauge to check groove side clear-
ance on the lower square rings. Install each
square ring on its piston. With the ring fully seated
in its groove, make several checks around the pis-
ton. The side clearance must not exceed 0.004 in.
(0.10 mm).
1529
POWERHEAD
INSPECTION
Use a machinist's straightedge to check clearance
on the upper Pressure-Back™ rings. Install each
Pressure-Back ring on its piston. Ring to piston
clearance should allow the straightedge to touch
the piston on both sides of the ring groove. See
image. Make several checks around the piston.
If the straightedge does not touch the piston,
remove the ring and clean the ring groove.
3125
197