3
9926806 R03 - 2015 - 2016 RANGER ETX / 570 2-SEAT 2015 - 2016 RANGER 570 CREW Service Manual
© Copyright Polaris Industries Inc.
3.9
ENGINE SPECIFICATIONS
CAMSHAFT / CYLINDER HEAD / CYLINDER
ITEM
STANDARD SERVICE LIMIT
Cranking
Compres-
sion
Not provided - Engine uses decompression mechanism. Reference Leak Down Specification
Cylinder
Leak Down
Service Limit = 15%, engine at operating temperature, regulated 100 psi (690 kPa) at cylinder.
Camshaft
Cam Lobe Height - Intake
1.30 in. / 33.10 mm 1.28 in. / 32.6 mm
Cam Lobe Height - Exhaust
1.291 in. / 32.80 mm 1.27 in. / 32.3 mm
Camshaft Bearings
Inspect by feel and fit. Replace
bearings and / or carrier assembly if
damage or wear is found.
Exhaust camshaft large bearing is not
serviceable.
Cylinder
Cylinder - Surface Warp Limit (cylinder head
surface)
.002 in. / 0.05 mm
Cylinder Bore
3.07 +/– .0003 in.
78.00 +/- 0.008 mm @ 33 mm down
from top of cylinder
Cylinder Out of Round Limit
.00078 in. / 0.020 mm
Cylinder Taper Limit
.00078 in. / 0.020 mm
Cylinder to Piston Clearance
.0003 - .002 in. / 0.008 - 0.062
Cylinder
Head
Surface Warp Limit
.0039 in. / 0.1 mm
Valve
Valve Lash (Cold) - Intake .005 ± .002″ (0.125 ± 0.05 mm)
Valve Lash (Cold) - Exhaust .014 ± .002″ (0.350 ± 0.05 mm)
Valve Stem Diameter - Intake .1958–.196 in. / 4.975-4.990 mm
Valve Stem Diameter - Exhaust .1950–.1956 / 4.955-4.970 mm
Valve Stem Oil Clearance - Intake .0003 - .0015 in. / 0.01 - 0.04 mm .0017 in. / 0.045 mm
Valve Stem Oil Clearance - Exhaust .0011 -.0023 in. / 0.03 - 0.06 mm .0025 in. / 0.065 mm
Valve Stem Overall Length - Intake
3.858 in. / 98.013 mm
Valve Stem Overall Length - Exhaust
3.426 in. / 87.0223 mm
Valve
Guide
Valve Guide Inner Diameter .1968 – .197 in. / 5.00 - 5.015 mm
Valve Seat
Valve Seat - Contacting Width - Intake
.0393 in. / 1.00 mm
Valve Seat - Contacting Width - Exhaust
Valve Seat Angles
17° ± 1.5°
45° ± 0.5°
70° ± 1.5°
ENGINE / COOLING SYSTEM
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