3.25
ENGINE
3
9923983 - 2012-2013 RZR 170 Service Manual
© Copyright 2012 Polaris Sales Inc.
5.
Record measurements. If cylinder is tapered or out of
round beyond specification, the cylinder must be
honed, bored or replaced.
Cylinder Hone Selection / Honing Procedure
Cylinders may be wet or dry honed depending upon the
hone manufacturer’s recommendations. Wet honing
removes more material faster and leaves a more distinct
pattern in the bore.
Honing to Deglaze
A finished cylinder should have a cross-hatch pattern to
ensure piston ring seating and to aid in the retention of the
fuel/oil mixture during initial break in. Hone cylinder
according to hone manufacturer’s instructions, or these
guidelines:
• Use a motor speed of approximately 300-500
RPM, run the hone in and out of the cylinder
rapidly until cutting tension decreases. Remember
to keep the hone drive shaft centered (or cylinder
centered on arbor) and to bring the stones
approximately 1/2” (1.3 cm) above and below the
bore at the end of each stroke.
• Release the hone at regular intervals and inspect
the bore to determine if it has been sufficiently
deglazed, and to check for correct cross-hatch.
NOTE: Do not allow cylinder to heat up during
honing.
• After honing has been completed, inspect cylinder
for thinning or peeling.
IMPORTANT: Clean the Cylinder After Honing
It is very important that the cylinder be thoroughly cleaned
after honing to remove all grit material. Wash the cylinder
in a solvent, then in hot, soapy water. Use electrical
contact cleaner if necessary to clean these areas. Rinse
thoroughly, dry with compressed air, and oil the bore
immediately with Polaris 4 Cycle Lubricant to prevent the
formation of surface rust.
If cylinder wear or damage is excessive, it will be
necessary to replace the cylinder. Hone only enough to
deglaze the outer layer of the cylinder bore.
Piston Inspection
1.
Measure piston outside diameter at a point 7 mm up
from the bottom of the piston at a right angle to the
direction of the piston pin.
2.
Subtract this measurement from the maximum
cylinder measurement obtained earlier.
= In. / mm.
Cylinder Taper:
Limit: .002” (.05 mm) Max.
Cylinder Out of Round:
Limit: .002” (.05 mm) Max.
CAUTION
A hone which will straighten as well as remove
material from the cylinder is very important.
Using a common spring loaded glaze breaker for
honing is not advised. Polaris recommends
using a rigid hone or arbor honing machine.
= In. / mm.
Piston to Cylinder Clearance
Std: .00039- .0015” (0.01- 0.04 mm)
Limit: .0039” (.1 mm)
EXAMPLE OF CROSS HATCH PATTERN
Piston
Piston Pin
7mm