Checking The Piston Ring Grooves - SELVA MARINE Dorado 50 EFI Service Manual

Piston ring dimensions:
Top ring a:
B: 1.17–1.19 mm
(0.0461–0.0469 in)
T: 2.30–2.50 mm
(0.0905–0.0984 in)
2nd ring b:
B: 1.47–1.49 mm
(0.0579–0.0587 in)
T: 2.60–2.80 mm
(0.1024–0.1102 in)
Oil ring c:
B: 2.36–2.48 mm
(0.0929–0.0976 in)
T: (reference data)
2.75 mm (0.1083 in)
2. Level the piston ring 1 in the cylinder
with a piston crown.
3. Check the piston ring end gap d at the
specified measuring point. Replace if out
of specification.
6C13G11
Piston ring end gap d:
Top ring:
0.15–0.30 mm
(0.0059–0.0118 in)
2nd ring:
0.30–0.50 mm
(0.0118–0.0197 in)
Oil ring:
0.20–0.70 mm
(0.0079–0.0276 in)
Measuring point e: 20 mm (0.8 in)

Checking the piston ring grooves

1. Measure the piston
Replace the piston if out of specification.
Piston ring groove:
Top ring a:
1.21–1.23 mm
(0.0476–0.0484 in)
2nd ring b:
1.51–1.53 mm
(0.0594–0.0602 in)
Oil ring c:
2.52–2.54 mm
(0.0992–0.1000 in)
Cylinder block
1
2
3
ring grooves.
4
5
6
7
8
9
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