Honda Civic Service Manual page 218

Piston Rings
End Gap
1 . Using a piston, push a new ring into the cylinder
bore 15 - 20 mm (0.6 - 0.8 in) from the bottom.
Measure the piston ring end-gap with a feeler gauge:
. lf the gap is too small, check to see if you have
the proper rings for your engine.
. lf the gap is too large. recheck the cylinder bore
diameter against the wear limits on page 7-16,
lf the bore is over the service limit, the cvlinder
block must be rebored.
Pkton Ring End-cap:
Top Ring
81642 engino
Siandtrd (New): 0.20 - 0.35 mm
{0.008 - 0.01,1 in)
Service Limit: 0.60 mm l0-02i1 inl
D16Y5. Dl6Y7, D16Y8 enginos
Standard lNewl: 0.15 - 0.30 mm
{0.006 - 0.012 in)
Ssrvic€ Limit 0.60 mm {0.024 inl
Socond Ring
816A2 ongina
Standard (Nowl: 0.40 - 0.55 mm
10.016 - 0.022 inl
Service Limit:
0.70 mm (0.028 inl
D16Y5, D16Y7, Dt6Y8 engines
Standard (New): 0.30 - 0.ia5 mm
{0.012 - 0.018 in)
Sorvice Limit 0.70 mm 10.028 inl
Oil Ring
81642 ongine
Standard {Now): 0.20 - 0.50 mm
(0.008 - 0.020 inl
Sorvico Limit:
0.70 mm (0.028 in)
Dl6Y5. Dl6Y7, D16Y8 €nginos
Standard (Nowli 0.20 - 0.70 mm
(0.008 - 0.028 inl
Servica Limit:
0.80 mm 10.031 in)
7-20
Replacement
1 .
Using a ring expander. remove the old piston rings.
Clean all ring grooves thoroughly.
NOTE:
.
U s e a s q u a r e d - o f f b r o k e n r i n g o r r i n g g r o o v e
cleaner with blade to fit piston grooves.
o Top ring groove is 1.0 mm (0.039 in)wide.
. Second ring groove is 1.2 mm (0.047 in) wide.
. Oil ring groove is 2,8 mm (0.11 in) wide.
. File down the blade if necessary.
CAUTION: Do noi use a wire blush to clean ring
lands. or cut ring lands deepol with cleaning tool.
NOTE: lfthe piston is to be separated from the con-
necting rod, do not install new rings yet.
3. Install new rings in the proper sequence and posi-
taon (see page 7-22).
NOTE: Do not reuse old piston rings.
(Commercially available)