3.8
9850043 R01 - 2017-2021 RANGER 500 / 570 Service Manual
© Copyright Polaris Inc.
ENGINE SPECIFICATIONS
CAMSHAFT / CYLINDER HEAD / CYLINDER
INCHES (MM)
Camshaft
Cam Lobe Height - Intake 1.5704" ± 0.0038" (39.89 ± 0.097 mm)
Cam Lobe Height - Exhaust 1.5405" ± 0.0038" (39.13 ± 0.097 mm)
Camshaft Journal O.D. - All (Standard) 0.9038" - 0.9046 " (22.957 - 22.978 mm)
Camshaft Journal O.D. - All (Service Limit) 0.9034" (22.947 mm)
Camshaft Journal Bore I.D. - All (Standard) 0.9055" - 0.9063" (23.000 - 23.021 mm)
Camshaft Journal Bore I.D. - All (Service Limit) 0.9072" (23.044 mm)
Camshaft Oil Clearance (Standard) 0.0008" - 0.0025" (0.022 - 0.064 mm)
Camshaft Oil Clearance (Service Limit) 0.0047" (0.121 mm)
Camshaft End Play (Standard) 0.0069" - 0.0128" (0.175 - 0.325 mm)
Camshaft End Play (Service Limit) 0.0157" (0.4 mm)
Cylinder Head
Cylinder Head - Surface Warp Limit 0.0024" (0.060 mm)
Cylinder Head - Standard Height 4.745" ± 0.0020" (120.53 ± 0.05 mm)
Valve Seat
Valve Seat - Contacting Width - Intake (Standard) 0.0393" ± 0.0039" (1.0 ± 0.10 mm)
Valve Seat - Contacting Width - Intake (Service Limit) 0.0551" (1.4 mm)
Valve Seat - Contacting Width - Exhaust (Standard) 0.0590" ± 0.0039" (1.5 ± 0.10 mm)
Valve Seat - Contacting Width - Exhaust (Service Limit) 0.0748" (1.9 mm)
Valve Seat Angles
30.0° ± 1.5° / 45.0° ± 0.5° / 60.0° ± 1.5°
Valve Guide Valve Guide Inner Diameter
0.2165" - 0.2171" (5.500 - 5.515 mm)
Valve
Valve Lash (Cold) - Intake 0.006" ± 0.002" (0.152 ± 0.050 mm)
Valve Lash (Cold) - Exhaust 0.008" ± 0.002" (0.203 ± 0.050 mm)
Valve Stem Diameter - Intake
0.2155" - 0.2161" (5.475 - 5.490 mm)
Valve Stem Diameter - Exhaust
0.2147" - 0.2153" (5.455 - 5.470 mm)
Valve Stem Oil Clearance - Intake
0.0003" - 0.0015" (0.010 - 0.040 mm)
Valve Stem Oil Clearance - Exhaust
0.0011" - 0.0023" (0.030 - 0.060 mm)
Valve Stem Overall Length - Intake 3.7704" (95.77 mm)
Valve Stem Overall Length - Exhaust 3.7964" (96.43 mm)
Valve Spring
Valve Spring Free Length (Standard) 1.7263" (43.85 mm)
Valve Spring Free Length (Service Limit) 1.683" (42.75 mm)
Cylinder
Cylinder - Surface Warp Limit (mating with cylinder
head)
0.00098" (0.025 mm)
Cylinder Bore - Standard 3.8976" ± 0.0003" (99.0 mm ± 0.008 mm)
Cylinder Out of Round Limit 0.001" (0.025 mm)
Cylinder Taper Limit 0.001" (0.025 mm)
Cylinder to Piston Clearance 0.00177" - 0.00295" (0.045 - 0.075 mm)
ENGINE / COOLING SYSTEM
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