Piston Rings - Honda Acura NSX 1991 Service Manual

Piston Rings

1 . Using a piston, push a new ring into the cylinder
bore 1 b-20 mm (0.6-0.8 in.) from the bottom.
2. Measure the piston ring end-gap with a feeler
gauge:
the proper rings for your engine.
l If the gap is too large, recheck the cylinder bore
diameter against the wear limits on page 7-13.
If the bore is over limit, the engine block must be
rebored.
Piston Ring End-Gap:
Top Ring
Standard (New): 0.25-0.40 mm
(0.010-0.016
0.60 mm (0.024 in)
Service Limit:
Second Ring
Standard (New): 0.35-0.50 mm
(0.014-0.020
0.75 mm (0.03 in1
Service Limit
Oil Ring
Standard (New): 0.2-0.7 mm (0.008-0.028 in)
0.8 mm (0.03 in)
Service Limit:
2.
.
3.
in)
in)
1. Using ring expander, remove old piston rings.
Clean all ring grooves thoroughly.
NOTE:
cleaner with blade to fit piston grooves.
oil ring groove is 2.8 mm wide.
CAUTION: Do not use a wire brush to clean ring
lands, or cut ring lands deeper with cleaning tool.
NOTE: If piston is to be separated from connecting
rod, do not install new rings yet.
Install new rings in proper sequence and position
(page 7-l 6).
NOTE: Do not reuse old piston rings.
7-l 5