Page 276 - Manual Oficina Polaris Sportsman 570 2014 a 2016
P. 276
ENGINE / COOLING SYSTEM
PISTON RING INSTALLED GAP HONING TO OVERSIZE
1. Place each piston ring inside cylinder. Use a piston
to push the ring squarely into place 1” (25.4 mm) CAUTION
down from the cylinder head gasket surface. If cylinder wear or damage is excessive, it will be
necessary to oversize the cylinder using a new
2. Measure installed gap with a feeler gauge at location
oversized piston and rings. This may be accomplished
q. by either boring the cylinder and then finish honing to
the final bore size, or by rough honing followed by finish
honing.
CAUTION
For oversize honing always wet hone using honing oil
and a coarse roughing stone. Measure piston (see
piston measurement) and calculate finished bore size.
Always leave .002 - .003" (.05 - .07 mm) for finish bore
sizing with a fine stone.
A finished cylinder should have a 45 degree cross-hatch
pattern to ensure piston ring seating, aid in oil retention
and reduce ring vibration during initial break-in. Hone
cylinder according to hone manufacturer’s instructions,
or these guidelines:
Piston Ring Installed Gap
Top Ring: • Use a motor speed of approximately 300-500 RPM,
Std: 0.0059 - 0.0122" (0.15 - 0.31 mm) run the hone in and out of the cylinder rapidly until
Limit: 0.0137" (0.35 mm) cutting tension decreases. Remember to keep the
Second Ring: hone drive shaft centered (or cylinder centered on
arbor) and to bring the stone approximately 1/2" (1.3
Std: 0.0094 - 0.0196" (0.24 - 0.50 mm)
cm) beyond the bore at the end of each stroke.
Limit: 0.022" (0.56 mm) • Release the hone at regular intervals and inspect the
Oil Ring Rails: bore to determine if it has been cleared, and to check
Std: 0.0098” - 0.0401" (0.25 - 1.02 mm) piston fit.
Limit: 0.0480" (1.22 mm)
NOTE
NOTE Do not allow cylinder to heat up during honing.
Always check piston ring installed gap after re-boring a
cylinder or when installing new rings.
3.154 9926803 R06 - 2014-2016 Sportsman 325 / ETX / 450 HO / 570 Service Manual
© Copyright Polaris Industries Inc.
