Checking The Piston Ring; Checking The Piston Ring End Gap; Checking The Piston Ring Groove - SELVA MARINE Wahoo 15 Service Manual

POWR

Checking the piston ring

1. Measure the piston ring dimensions B
and T. Replace the piston ring set if out
of specification.
Piston ring dimensions:
Top ring a:
B: 1.17–1.19 mm
(0.0461–0.0469 in)
T: 2.30–2.50 mm
(0.0906–0.0984 in)
2nd ring b:
B: 1.17–1.19 mm
(0.0461–0.0469 in)
T: 2.4–2.6 mm
(0.0945–0.1024 in)
Oil ring c:
B: 2.34–2.46 mm
(0.0921–0.0969 in)
T: 2.75 mm (0.1083 in)

Checking the piston ring end gap

1. Level the piston ring 1 in the cylinder
with a piston crown.
2. Measure the piston ring end gap a at the
specified measuring point b.
5-53
Power unit
5
b
NOTE:
The figures are for reference only. Depend-
ing on how the parts are assembled, the
actual measurements may not be within the
specified ranges.
Piston ring end gap a (reference
data):
Top ring:
0.15–0.30 mm
(0.0059–0.0118 in)
2nd ring:
0.25–0.4 mm
5
(0.0098–0.0157 in)
Oil ring:
0.2–0.7 mm (0.0079–0.0276 in)
Measuring point b (reference data):
20 mm (0.8 in)

Checking the piston ring groove

1. Measure
Replace the piston if out of specification.
1
a
the piston ring
S6AG5860
5
grooves.
6AG3J11