Piston Rings - Mercury 40 Service Manual

Piston Rings

PISTON RING SIDE CLEARANCE
1. Measure piston ring side clearance. Replace piston and/or piston rings if out of specifi-
cation.
PISTON RING END GAP CLEARANCE
1. Measure piston ring end gap clearance. Replace piston ring if out of specification.
a -
90-828631R3 MARCH 1999
Piston Ring Side Clearance
Top
2nd
a
Push Piston Rings into Cylinder 0.8 in. (20 mm) Deep. Push in the Rings Using
the Piston.
Piston Ring End Gap
Top
2nd
Oil
55842
0.002 - 0.003 in. (0.04 - 0.08 mm)
0.001 - 0.003 in. (0.03 - 0.08 mm)
53747
0.006 - 0.012 in. (0.15 - 0.30 mm)
0.012 - 0.020 in. (0.30 - 0.50 mm)
0.008 - 0.028 in. (0.20 - 0.70 mm)
CYLINDER BLOCK/CRANKCASE
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